Anyone know what this Delta is doing?

[-]

Cascadeflyer61@reddit

There is a saying in ATC “American can you speed up” “Delta WHAT are you doing?” “United I don’t have time to argue!” Lol…

[-]

DublinLions@reddit

Compass Swing. It's done periodically to check the specific aircraft's magnetic deviation, as it's unique to each one. Also needs to be done when electrical components are updated etc.

The aircraft is aligned with the correct heading and the difference shown on the compass is noted. The result is the deviation placard posted on the compass in this pic.

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Own_Reaction9442@reddit

Do modern jets still carry a whiskey compass as a backup, or is it all electronic now?

[-]

flyindogtired@reddit

Required by law. Every airplane has one

[-]

AstuteCouch87@reddit

You don't need a whiskey compass anymore. Just some sort of magnetic direction indicator. At least for private stuff, maybe jets are different.

[-]

JT-Av8or@reddit

We need one on a certificated aircraft still. And ashtrays!

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yourlocalFSDO@reddit

Aircraft can be certified without one.

[-]

Sure anything can be done. For money. But who’s going to do that insane STC just to pull a compass. You saw what McD had to do for the MD-88 right? What an engineering nightmare just to install something we never used.

[-]

yourlocalFSDO@reddit

New aircraft are certified from the factory without a compass. Nothing to do with an STC

[-]

roguemenace@reddit

We need one on a certificated aircraft still

Do you?

And ashtrays!

AFAIK those are only required on transport category aircraft.

[-]

Key_Sign_5572@reddit

Anymore - ?

Since which date?

[-]

roguemenace@reddit

2013

[-]

im_the_natman@reddit

I think primarily it comes down to certification. Those airframes were originally certified with those annoying pieces of shit (if I never have to replace another one it'll be too soon), so the expense to update the cert to anything different isn't worth it.

[-]

SaltyCAPtain1933@reddit

Not since something like 2013. 91.205 verbiage now says "magnetic direction indicator." I've flown aircraft made in 2019 and 2020 that had dual AHRS and no magnetic compass.

[-]

BeenThereDoneThat65@reddit

Really? Show me where the Whiskey compass is in the Gulfstream G-V, G350/450/550/650/700 and 800’s is

We will wait

[-]

Darryl_Lict@reddit

Speculation on why it's called a whiskey compass.

There are many rumors as to how the magnetic compass, found in the cockpit of many aircraft, became known as the ‘whiskey compass.’ Some say it was dubbed the whiskey compass to remind pilots to refill the compass fluids with the alcoholic beverage instead of water due to its lower freezing temperature. Others say since the compass is also known as a ‘wet compass’ and with whiskey being the phonetic pilot-alphabet for ‘w,’ it then became the whiskey (‘w’) compass. Others claim that the US Navy would use whiskey in their compasses, up until sailors started drinking it due to their dry ship rule.

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Own_Reaction9442@reddit

I think it's because the compass fluid looks kinda like whiskey.

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pbmadman@reddit

Imagine getting pranked with blinker fluid then getting told to grab some compass fluid but not to drink it.

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Own_Reaction9442@reddit

Could you grab a bucket of prop wash while you're at it?

[-]

xteve@reddit

Go to supply for a long stand.

[-]

DesmondPerado@reddit

After you're done that, go turn off the windsock.

[-]

Due_Knowledge_6518@reddit

I think the actual contents are closer to kerosene though. clear, some viscosity to it, won’t corrode the parts

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Own_Reaction9442@reddit

Yeah, that's my understanding too.

[-]

SirLoremIpsum@reddit

Others claim that the US Navy would use whiskey in their compasses, up until sailors started drinking it due to their dry ship rule.

That's the least believeabke one. Sailors drink rum!!

Any anyone with 5 minutes exposure to sailors knows if there's alcohol in it, they'll drink it! No self respecting marine engine would make that mistake

[-]

Activision19@reddit

My great uncle was on a USN destroyer tender in WW2. When they announced that Japan surrendered some sailors attempted to get into the medical locker and the optical equipment repair shop because they knew there was alcohol in those compartments. As an optical repairman my great uncle was ordered to guard the optical shop to prevent the crew from getting at their isopropyl alcohol. At one point in the days immediately after the surrender, he had to repair the ship’s compass on the bridge since someone apparently attempted to drain the alcohol out of it overnight (they were at anchor in Tokyo harbor so there weren’t exactly using it to navigate anywhere at the time).

[-]

ic33@reddit

No self respecting marine engine would make that mistake

Are we forgetting about sailors drinking alcohol from torpedoes?

https://en.wikipedia.org/wiki/Torpedo_juice

[-]

Lampwick@reddit

least believeabke one

Yeah, as soon as an etymology cites a nautical origin, there's like a 75% chance it's false.

[-]

Bigfops@reddit

Everyone knows the whiskey is for the true virgins

[-]

MelancholyDick@reddit

Thanks Claude.

[-]

Gideon_Lovet@reddit

The lower freezing temperature is most likely I think. I fly in open cockpit biplanes, and in colder weather and higher altitude, it gets absolutely frigid. WWI pilots had to bundle up with wool jackets and mittens because it was so cold, and sometimes those compasses are mounted in places where they don't get any warmth from the engine, or they are exposed to the cold air. Having them not freeze at high altitude back then was very important.

[-]

FlyingA10Brrrt@reddit

Do I have a whiskey compass on my plane with a placard? Yes. Have I ever actually cared to look at the placard except when crossing the ocean? No.

[-]

SaltyCAPtain1933@reddit

I've never looked at the placard crossing the ocean?

[-]

Fun-Mulberry8780@reddit

What is a whiskey compass?

[-]

Own_Reaction9442@reddit

Like in the photo in the reply above. A magnetic compass designed to be viewed edge-on so it can be installed in the instrument panel of an aircraft.

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untitledmillennial@reddit

Why isn't the compass made so that the outer ring with the numerals can be rotated?

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KiwieeiwiK@reddit

The deviation changes in different directions. It's not uniformly off to one side, it's slightly wavy.

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commandercool86@reddit

It is, if the deviation is too great on the compass reading from magnetic North, it can be recalibrated.

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bunabhucan@reddit

"The plane is a magnet" in the sense that it has some ferrous metal and magnetic fields from electrical equipment and wires. The compass sees the earths magnetic field plus the planes magnetic field. Because the "plane is a magnet" can point any direction the error is different depending on where the plane is pointing. A truly accurate dial would need varying degree intervals to account for this.

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C4-621-Raven@reddit

It can be adjusted and that is the main purpose of the compass swing procedure, but it’s impossible to get it perfect in all 12 headings on the card. Some will always be off by a couple degrees. It’s just the reality of how a compass works.

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untitledmillennial@reddit

What if they used two magnets that had the opposite deviation?

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C4-621-Raven@reddit

A lot of them do have two sensing magnets, but they’ll never have perfectly opposite deviations and they do interfere with each other and create a new set of deviations.

It’s good enough as a last resort standby instrument. If you lose enough navigation equipment to rely on this thing you’re diverting to the nearest airport and it’ll be accurate enough to get you there. That’s all it needs to do.

Realistically on modern airliners most pilots will fly their whole career and never actually use it.

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Aidan196@reddit

Because the deviation is not consistent through the entire compass.

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SomeRandomSomeWhere@reddit

Would using an airplane tug be cheaper in terms of fuel burn/maintenance? I imagine that aircraft just burned over 1000kg of fuel by moving around on the ground like this. And thats adding to the engine hours as well in terms of maintenance.

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Aidan196@reddit

Towing takes longer and the mechanics that would be preforming an compass swing are expensive. I'm not sure what the fuel burn is on a CRJ, but I would be pretty shocked if this took anywhere near 1000kg of fuel. Engine hours on the ground are not tracked, just the airtime, so you're not increasing the maintenance burden by taxiing. You also need to have the engines running to do a compass swing, as the deviation will change depending on what is or isint turned on.

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Cheezeball25@reddit

When both engines are running, you can expect roughly 1000l lbs an hour fuel burn on a CRJ at idle. As one whose done a few CRJ compass swings, you'd be shocked how long it can take if you have to adjust the magnetic flux detector compasses. I've seen it take hours before. And you're absolutely correct, both engines must be running, and you can't have a tug anywhere near the plane, since it can interfere with the readings.

-CRJ mechanic

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Aidan196@reddit

1000 lbs is 450 kg, so yeah that makes more sense. Obviously if you have a misbehaving compass or a long taxi it will take longer, but with everything going well I've done swings in well under an hour

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Cheezeball25@reddit

Yeah if you don't need to mess much with the adjustment boxes it goes real fast, its only when you gotta start measuring the voltages through the potentiometers and manually adjusting them over and over again does it start to cause problems

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Aidan196@reddit

Okay I've never needed a multimeter for a compass swing, y'all must have some interesting tech in those things

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Cheezeball25@reddit

By "interesting" it's more like ancient. Any modern inertial reference system would make my life way easier, but that was only an option on the CRJ. Instead I get to manually adjust the actual voltages being sent through the flux detectors. It's quite analogue, but it gets the job done

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CompetitiveBox314@reddit

Are the mechanics actually the ones operating the plane for these tests or is there a pilot too?

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JT-Av8or@reddit

Mechanics. It’s just a taxi check.

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pradise@reddit

You pretty much answered every question and follow up I had.

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clburton24@reddit

I can almost guarantee 1000kg of fuel was not used. It was an empty plane with no cargo and likely a light fuel load. Is imagine it was probably a little more than a human carriable amount.

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pezdal@reddit

Plane weight doesn’t significantly affect the fuel burn for a compass swing. It’s more about how much fuel the engines burn at idle, which for a jet, is significant.

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JT-Av8or@reddit

No it’s not that much and the tug would cause magnetic interference. The plane has to be checked in its own certified condition, radios on etc.

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C4-621-Raven@reddit

It’s best to have the airplane be as alone as possible for it. Putting a couple tons of steel in front of the nose has a way of interfering with the magnetic compass.

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NotPromKing@reddit

It’s best to have the airplane be as alone as possible

TIL I'm an airplane.

[-]

Seaguard5@reddit

This guy pilots

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FabulousSOB@reddit

I was sure it was a free grazing.

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XeernOfTheLight@reddit

So NOT donuts? Damn

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vee_lan_cleef@reddit

I figured this out because my phone asks me to do it.

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Cheezeball25@reddit

Tyson is a maintenance location for Endeavor Air, who flys the CRJ. As one whose done a few compass swings for the CRJ, it can be a tedious one if you gotta go through the full process with the magnetic flux detectors. The adjustment units are in the avionics bay under the plane, so you gotta taxi it to the correct bearing, verify the direction with a separate compass outside the plane, then manually adjust potentiometers to get the correct voltages through the detectors to adjust what the pilot can see in the cockpit.

Based on the fact that I don't see anyone outside the plane, I'm gonna guess either they're either just verifying what the compass's are doing here, or checking the error on the standby compass, which is the analogue one in the cockpit.

[-]

XYooper906@reddit

In addition to what was said above, sometimes a compass swing is done after an aircraft has been degaussed after some ferrous materials had become magnetized from a lightning strike. Magnetized parts can cause a deviation of the compass headings, particularly if they are near the cockpit. Windshield posts and associated hardware are common culprits.

[-]

RangerSad3081@reddit

It’ll probably be patched next update

[-]

Thin-Ebb-9534@reddit

Warming up the tires…

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N314ER@reddit

His wife’s in labor and he’s pacing in the waiting area.

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concorde77@reddit

He's waiting for takeoff clearance and getting very impatient with ATC lol

[-]

JetlinerDiner@reddit

Donuts

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helloiisjason@reddit

Trying to find a place to poop

[-]

Nikerium@reddit

🔸Smartass Answer

Someone up in the control tower at the McGhee–Tyson airport is using a laser pointer just to making sure that the Delta Connection is getting the proper amount of exercise that it needs.

🔸Serious Answer

The Delta Connection aircraft is performing what's known as a compass swing; which is a calibration procedure used to minimize magnetic deviation errors in an aircraft's magnetic field.

[-]

110percent_canadian@reddit

Compass swing, I did 2 of theses last week in a T-6 Texan II

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SquirrelMoney8389@reddit

Clearly he's in a holding pattern

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Red5_StandingDown@reddit

It's an airport takeover event. A bunch of pilots bring their souped up Jets out to the runways and do donuts while their overweight girlfriends in too short shorts cheer them on

[-]

csintroyeahhhhhhh@reddit

I owe you a 10 second plane

[-]

PsilopathicManiac@reddit

Souped? 🤣

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Red5_StandingDown@reddit

Yes, usually chowder but some bisque

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LondonKiwi66@reddit

Would love to watch the plane drag racing.

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3_if_by_air@reddit

Mark my words, there will come a day when they build a "Tesla Cyberplane" that can go 0-500 mph in 10 seconds

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GigaG@reddit

I think that’s called a taxi test :P

[-]

StopBidenMyNuts@reddit

RuPaul’s Plane Drag Race

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Highspeedfutzi@reddit

Something like this? : https://youtu.be/Slei8n08Cqk?si=5JxQSqhfdxbsa7OR&t=165

[-]

Phalanx32@reddit

What's the airplane equivalent of a Dodge Charger?

[-]

ExplorerAA@reddit

This maneuver is done to make sure the magnetic compass is telling the truth. Most likely the previous flight crew wrote up that the compass was deviating and needed recalibrated. Or, if any maintenance that affects the nose or avionics was performed compass swing maneuvers may be necessary as well.

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Tangata_Tunguska@reddit

compass was deviating and needed recalibrated

Why do you hate the verb "to be" so?
https://ygdp.yale.edu/phenomena/needs-washed

[-]

ExplorerAA@reddit

The sentence is the form used in Midwest regional dialects. Obviously, you understood. I don't believe reddit requires grammar police. You autistic? (we hate "are" too!)

[-]

Tangata_Tunguska@reddit

Obviously, you understood

I understood most of what was said in Deliverance, too

[-]

ExplorerAA@reddit

You seem like a very lonely person. I pity you.

[-]

Tangata_Tunguska@reddit

I'll let my wife and kids know

[-]

anattemptwasmadeonce@reddit

Women pilots. s/

[-]

aviation-ModTeam@reddit

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[-]

johnboo89@reddit

Looks like it’s heating its tires for better traction.

[-]

class_rando_fxx@reddit

Doin sikk donuts 🍩 on the tarmac 💨

[-]

Master-Bad910@reddit

Learning to square dance?

[-]

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[-]

disappearingbag@reddit

Someone forgot their hat

[-]

Cool_Ur_Jets_Man@reddit

🤭DONUTS‼️🤣

[-]

rcv211v@reddit

Engineers performing a compass swing

[-]

DefEddie@reddit

That’s hilarious, the procedure on early 2000’s cars was similar.
I used to drive in circles and figure 8’s at the big truck stop when I had to do this on Fords lol.

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wildmaninid@reddit

Oh man that's bringing back many memories. Same process on GM vehicles with compasses.

[-]

TheAgedProfessor@reddit

Had to do it with my phone while hiking last weekend for the first time in at least a decade. Completely forgot it was a thing.

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ThePrussianGrippe@reddit

I’ve had to occasionally do it with my left arm when my watch needs a compass reset.

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Different_Umpire9003@reddit

Looks like a great time 😂

[-]

dinanm3atl@reddit

This is what it looks like.

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Sm0key-the-bear@reddit

The part you can’t hear is them going “weeeeeeeee” in the cockpit

[-]

geocapital@reddit

Or arguing. It’s left, no it’s right, no it’s left

[-]

ViolettaQueso@reddit

My mom giving my dad directions lol

[-]

Saturn_winter@reddit

my mom struggles with her rights and lefts and has to do the 2 Ls thing with her hands. One time we were driving on vacation and she got them mixed up and had us driving the wrong way for hours lmao

[-]

ViolettaQueso@reddit

This is perfect. Why are moms so cute?

I bet she loves when you bring this story up now 😂😂😂😂

[-]

MorningMushroomcloud@reddit

This is why spouses should not pylote together

[-]

ViolettaQueso@reddit

This just made me laugh way too hard. Childhood trauma!!!

[-]

Wong0nePhotography@reddit

Do u turn left?

Right. -Why'd you turn left?!

You said right!

[-]

Alternative-Bee-3594@reddit

Every couple everywhere

[-]

40KaratOrSomething@reddit

No, you military left!

[-]

penywisexx@reddit

It’s my left not your left!

[-]

DutchBlob@reddit

Now this is a wholesome comment

[-]

dinanm3atl@reddit

That's what I do in the C172.

[-]

hiking_mike98@reddit

That’s plane zoomies and you can’t convince me otherwise.

[-]

HesSoZazzy@reddit

Had to do the same thing in our 90 Grand Prix. Felt like such a goober.

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berrybyday@reddit

As a casual aviation nerd, a lot of times I open threads and get discussions that are beyond my interest and/or knowledge levels. Which is fine! I am very comfortable in my casualness of it. However in this case, I am so delighted to put away this little tidbit that not only makes sense to me, but is also quite entertaining to witness!

[-]

wolfganggartner5@reddit

What’s a compass swing

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Rule_32@reddit

And wearing out the nose tires!

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whoneedskollege@reddit

Looks like some mating dance for some type of bird or insect

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chrillekaekarkex@reddit

It’s telling the other planes where the nectar is.

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Excellent_1918@reddit

😂

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DamNamesTaken11@reddit

Well, when a daddy Boeing 777 and mommy A330…

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cheesegoat@reddit

Looks like someone hasn't learned you can pop the compass out /s

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AtomicGrosbeek@reddit

Is it known in the biz as “donuts”?

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Cornul11@reddit

Are the engineers allowed to operate a plane? Are they certified? Do they have to be?

[-]

railker@reddit

Not for flight, but depending on the setup there's at least some sort of training and authorization, yes. We'd go take airplanes to the runway and do full power engine runs, spend hours out there after heavy checks testing every system and function.

May involve simulator time to simulate reacting to ground emergencies like engine fires, check rides with other certified individuals, and of course having a radio license and appropriate authorization if you're going to be taking the aircraft around the airport and needing to speak with ATC.

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CovfefeAndHamburders@reddit

Mechanics can be certified to taxi under power.

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Street-Milk-9014@reddit

*technicians performing a compass swing

[-]

brazilian_irish@reddit

Or the wind os changing 180 degrees every 30 seconds

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MoccaLG@reddit

Unruly Engineers performing disney land?

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AbeFromanEast@reddit

Is that what they're calling donuts now?

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MAJOR_Blarg@reddit

On a naval vessel we do this to "swing the compass" and adjust for how the metallic structure of the ship itself affects the compass readings. I had never considered that aircraft would follow the same procedure.

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Joehansson@reddit

It is exactly that, calibrating the instruments, some airports have designated areas to do so

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idostufandthingz@reddit

Just pre flight nerves, pacing is a common symptom

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LexSombra@reddit

We need a “wrong answers only” version for this

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Joehansson@reddit

We might already have one

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Pristine-Copy9467@reddit

I imagine the pilot is inside going “weeeeeeeeee!”

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blastman8888@reddit

I was thinking maybe a 360 to look for aircraft landing if it was an un-towered airport. Airnav says it has a control tower.

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HabANahDa@reddit

Mating dance

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Admirable_Hat_4940@reddit

Having some fun!

[-]

iepure77@reddit

Vacuuming

[-]

dsyncd@reddit

Clearing turns.

[-]

Able-Wolverine-9334@reddit

They're breaking it down

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dreadpiratefezzik42@reddit

I see cones on the ground. Probably a MX getting taxi qualified.

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NoComment6@reddit

Rabies, poor thing.

[-]

theLuminescentlion@reddit

Frolicking

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General_Duh@reddit

It’s trying to find itself.

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Dreamerlax@reddit

Doing donuts probably.

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Legitimate_Humsn@reddit

A cool trick

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TypicalRecon@reddit

Funny how i had to do this in my 2007 dodge to recalibrate the GPS

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Dent8556@reddit

Pacing

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cabeck103@reddit

It’s giving “I’m the house and I’m in the house bored”

[-]

techsnapp@reddit

The aircraft had to pee but they weren't at the gate yet.

[-]

PhoenixSpeed97@reddit

Poor thing spun around in circles too many times

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0range-duche-B4G@reddit

AI and GPS coordination sync. Please sit back and relax.

[-]

TheCookingPilot@reddit

I’m sure it’s been stated several times already, but there are most likely doing a compass swing. “A compass swing is a maintenance procedure to calibrate an aircraft’s magnetic compass. It corrects for deviation—errors caused by the aircraft’s own magnetic fields (from engines, avionics, wiring, etc.). The aircraft is placed on a compass rose (calibrated reference) or turned through known headings. Technicians then adjust the compass’s compensating magnets to minimize errors, ensuring accurate heading readings in flight.”

[-]

SomeLostBeing@reddit (OP)

by this point I’m just laughing at all the jokes, but thank you for your response nonetheless!

[-]

Adept-Opinion8080@reddit

He's trying to knock a bug off the windshield

[-]

ExhaustedHungryMe@reddit

The plane has its audition soon for the Delta Figure Skating Team, and so it’s practicing its school figures.

Keep filming and you might get to see it attempt a quadruple axel!

[-]

IndominusBaz@reddit

It has the zoomies

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Sufficient_Grand2789@reddit

His best

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wayne0004@reddit

They're dumping fuel because they need to do an emergency takeoff.

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BjornToulouse_@reddit

Oh, it's just looking for a place to pee. My dog does that all the time.

[-]

sequins_and_glitter@reddit

Thank you for this 🤣🤣 I snorted

[-]

Gr8Bobbo@reddit

Warming up the tires for the restart

[-]

Holiday-Reality-7415@reddit

donuts

[-]

Qzx1@reddit

Zoomies!

[-]

NeverEnoughSunlight@reddit

Pondering a life decision with serious consequences. /s

[-]

theusualsuspects345@reddit

I mean have you ever tried to drift a 717? Its harder than you'd think! /s

[-]

sporkemon@reddit

https://youtu.be/XKQyhAtfIpg?si=QzoHoEYjpS82VyWv

looks like a hell of a lot of fun though

[-]

MonsieurReynard@reddit

And then, suddenly, much easier than you think

[-]

HydrodynamicShite@reddit

I assume compass calibration

[-]

hi-nick@reddit

like they're filing a new "speed" but in a plane..

[-]

Individual-Ant-2014@reddit

Donuts

[-]

Cyber-Soldier1@reddit

Delta Force

[-]

edchavez@reddit

Delta Donuts

[-]

flounderflound@reddit

Former GM mechanic here. He's calibrating the compass.

[-]

BearFan34@reddit

First thing I thought of. And I’m not drunk.

Yet

[-]

ep01081935@reddit

I think it’s a tango. You know, delta tango you’re clear to foxtrot.

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Which_Material_3100@reddit

Is it possible they just did maintenance on the nosewheel steering? I’ve not seen an airliner doing compass swings before.

[-]

Tarnished-Sausage@reddit

Having fun

[-]

dankskent@reddit

They’re flying to Tokyo, gotta practice their drifting first

[-]

airport-codes@reddit

IATA	ICAO	Name	Location
TYS	KTYS	McGhee Tyson Airport	Knoxville, Tennessee, United States

I am a bot.

^(If you are the OP and this comment is inaccurate or unwanted, reply below with "bad bot" and it will be deleted.)

[-]

OfferExtreme4787@reddit

uhhh bad bot

[-]

analogengineer@reddit

Many years ago I was on a business trip. The company had its own jet, and I was the only passenger that day (the main use of the jet was to transport circuit boards to field service offices for quick response). The pilot (crew was composed of Viet Nam war pilots... top skills) told me the ground crew had filled the fuel tanks unevenly, so he opened a valve between the tanks and started doing donuts on the tarmac, the centripetal force sloshing the fuel from the full tank to equalize the balance. He explained that they normally would have had the crew pump out one tank and re-fill properly, but as I was the only passenger they decided to do it the "fun" way. So maybe it's that.

Best flight I ever had, they let me sit with them, explained everything that was going on.

[-]

Federal-Business-796@reddit

That's the break in procedure for a replacement rear differential

[-]

BustTheCoin@reddit

This looks fun!

[-]

Pletcher87@reddit

Delta loves to fly and it shows!

[-]

thewizardbeard@reddit

True Virgins Make Dull Companions, just add Whiskey.

[-]

Complete-Log9090@reddit

Weeeeeee!

[-]

Thick_Sympathy_8021@reddit

Drawing the lower case delta symbol while the pilot is bored and waiting for take-off clearance?

[-]

No_Guess_4124@reddit

Truffle hunting

[-]

Senior_Ad_5454@reddit

Disorienting the passengers

[-]

NotThatMat@reddit

Doughnuts?

[-]

0ggiemack@reddit

Doughnuts

[-]

deanmass@reddit

I want to see this with Yackety Sax overdub

[-]

TheEDMWcesspool@reddit

Ground holding pattern..

[-]

bestname_ever55@reddit

Scuffing the tires to get better traction on launch.

[-]

Tangata_Tunguska@reddit

Gotta keep them warm

[-]

LilOrphanFunkhouzer@reddit

Just new wheel goofin’

[-]

justinsane15@reddit

For aircraft tires here in Knoxville, you really can't beat Neumáticoria la Ballerina.

[-]

memyselfaneye@reddit

Donuts

[-]

Canajan_bgi@reddit

Grazing in its natural habitat.

[-]

DroidLord@reddit

Sir, this is not r/ShittyAskFlying 😂

[-]

Oscaruit@reddit

I thought it was just looking for a washer it dropped.

[-]

Bluemikami@reddit

God dame, reminded me of that family guy' firetruck on his natural habitat video

[-]

Canajan_bgi@reddit

That bit is so awesome, “the ambulances will have to wait there turn” 🤣

[-]

mildlycuriouss@reddit

Haha

[-]

bakertj7@reddit

Street takeover

[-]

IllSpecial62@reddit

It’s got the zoomies. Pilots have to drive around a little to burn off some steam

[-]

Tater_Mater@reddit

Weeeeeeee!

[-]

Grolschisgood@reddit

Looks like figure 8's to me

[-]

starkruzr@reddit

this isn't funny, planes only do this when they're in extreme pain and distress

[-]

Aerion91@reddit

Probably listening to Flo Rida

[-]

JCGJ@reddit

Obviously doing sick donuts behind the 7/11

[-]

RIF_Internet_Goon@reddit

A little known fact about airplanes is that they communicate using intricate dances just like honey bees! 🐝💃🕺

[-]

Thin_Caterpillar6998@reddit

Like a mating ritual?

[-]

RIF_Internet_Goon@reddit

When a Boeing and a Gulfstream love eachother very much...

[-]

HarryTruman@reddit

And just like that, a new sub-genre of fan-fic aviation is born.

[-]

omnomguy5@reddit

He’s taking off to Tokyo… Drift.

[-]

Tommy_J@reddit

An aircraft compass swing is a maintenance procedure used to measure and correct a compass’s deviation errors. By turning the aircraft to various magnetic headings and comparing the readings to a calibrated reference, technicians can adjust the compass or create a deviation card to ensure precise navigation

[-]

Ryan-v-616@reddit

Look on flight radar 24 and check the flight number. If it’s between 9000-9999 then it’s a maintenance flight. May have had an issue with the inbound flight that had to be repaired and maintenance fixed and is now testing.

[-]

tob007@reddit

Do they get a pilot to test or can the maintenance guys take it our for a spin? Didn't a maintenance crew have a runaway situation once or twice in the past?

[-]

HarryTruman@reddit

take it out for a spin

lol

[-]

ohiowrestler138@reddit

Maintenance can taxi a plane as long as there's no intent for flight. The airline will have specific training.

Maintenance is more likely to get into trouble like that simply because they're specifically testing systems out, so you have non-routine procedures and the possibility of failures/repair mistakes.

[-]

Ryan-v-616@reddit

Some maintenance personnel are able to taxi and maneuver planes on the ground. They have to be in contact with ATC.

[-]

airpowmech@reddit

Most airlines let certain mechanics get certified to taxi and run the engines.

[-]

AvianOtter@reddit

TYS is a maintenance base for Endeavor, they use 5550 numbers for maintenance flights

[-]

Foggl3@reddit

My airline uses a 00xx # for maintenance purposes, reposition/non revenue flights are 9xxx.

[-]

Seamo_Bojamo@reddit

Pilot is practicing for their interview with Southwest?

[-]

Stunning_Ad_1685@reddit

That’s how they warm up the tires

[-]

Mantecao@reddit

I think they are not sure which exit to take at the roundabout

[-]

blaineaa@reddit

In high school we used to call this “cutting cookies.”

[-]

ThatRunwayBehindUs@reddit

Have you ever had a messed up compass in your phone, and you have to do that figure eight motion? This is similar, but it's how we align the compass for the jet!

[-]

__Hello_my_name_is__@reddit

Okay it blows my mind that entire planes have to do that!

[-]

w_a_w@reddit

It's much easier than chopping off the cockpit, swinging it around with a crane, and reattaching.

[-]

Disastrous-Wall-6943@reddit

Especially when the compass isn't usually in the cockpit. Except the whisky compass, not that gets calibrated differently.

[-]

w_a_w@reddit

So typically mixed in with the lower deck avionics I imagine?

[-]

Disastrous-Wall-6943@reddit

Depends on the airplane but theyre usually out near the wing tip area. Keeps it further away from potential electrical interference or possible magnetic cargo that could throw off the reading.

[-]

Cheezeball25@reddit

For the CRJ the flux detectors are indeed out on the wings, but the adjustment spot for the technician is in the avionics bay under the front of the plane

[-]

Disastrous-Wall-6943@reddit

Yeah, it's been 15(?) years since I worked anything close to a CRJ, and those were Globals am Challengers.

Only thing I remember about the avionics bays in those is how much of a pain it was to get through that tiny hole in the belly or around the DC power box towards the nose. I heard CRJs were better, had an actual door in the belly.

[-]

Cheezeball25@reddit

Yeah the door for the CRJ avi bay is just behind the passenger door, but man they cram so much under there it's just a tunnel of pain. They at least had the decency to put the adjustmen units right next to the avionics bay door, so those weren't terrible to get to

[-]

Disastrous-Wall-6943@reddit

OK, yeah, I texted a friend still at Bombardier, the Global avionics hatch is in the same spot as the CRJ door, but it's tiny, it's like the size of a fuel panel, where the forward baggage bay would be is more avionics bay. The tunnel is the same size.

I almost couldn't bend the right way to get in there it just didn't work with my size and I could mash myself anywhere on an E-170.

The cockpit access on Globals had a DC Power Center right below the door, and I could barely get through that, but couldn't get back out that way so I had to go headfirst out the belly.

Globals were a shit show, the 5000 was better because they had the upper avionics rack, and it wasn't because I was fat, I'm just tall and broad.

[-]

Cheezeball25@reddit

Yeah tall and broad is not the combination you want on these planes, I'm built like a stick so I usually don't have problems. At least the CRJ door isn't tiny.

[-]

Disastrous-Wall-6943@reddit

Yeah, that's why I left business jets.

ERJs were pretty alright, they had their spots, but I was a 130 guy so I was used to smaller spaces.

Now I'm working wide bodies and they're mostly great. Engines get a little tight but everything is still accessible.

[-]

mister_peeberz@reddit

For now. This is a market just waiting to be tapped. Unlimited potential. I can cut you in to my startup now, if you want. My new small business called Alignr Compass Solutions

[-]

w_a_w@reddit

Hey, asshole! This was my idea! Of course my startup is already underway. My post being before yours will stop a jury dead in their tracks!

Let me know when your IPO drops. I'm in. 😜

[-]

jrsmith43@reddit

Using up the last of the fuel they prepaid for at the rental counter before they turning it in.

[-]

EnterCosmos@reddit

It's doing the pee pee dance waiting to use the restroom

[-]

SpiritedInflation835@reddit

Annual lubrication of the magnetic compass

[-]

mananius2@reddit

Warming up lap

[-]

Taibo123@reddit

Tokyo drift

[-]

BillionsofRedditors@reddit

It's called a donut

[-]

YebelTheRebel@reddit

Donuts

[-]

Gun-In-The-Water@reddit

This is my airport!!! Flew often by myself while I was in high school. Drank moonshine in this airport. Took dabs in the restroom. Part of me grew up here.

[-]

BennyS04@reddit

Rippin’ Shitties

[-]

johntwilker@reddit

Plane has the zoomies

[-]

BeachHut9@reddit

Learning to drive an aircraft

[-]

SevenBlade@reddit

Lazy 8s on a different level.

[-]

Expensive_Zebra6362@reddit

Same with my Roomba, maybe needs a software update

[-]

Puzzleheaded-Pen4413@reddit

Its circling

[-]

Away_Web8643@reddit

You need to play the Benny Hill music.

[-]

XdraketungstenX@reddit

Thank you! I’m not the only one who thought so.

[-]

weaselkeeper@reddit

This not a compass swing. During a compass swing you stop at N then S and repeat till dialed in then the same thing E and W and repeat, then back to N and S and keep repeating till you have the compass as close to correct as you can.

What they are doing here is checking and setting the heading indicator, AP and or traffic. You taxi in circles to make sure the nav radio is talking to the heading indicator or that the AP is chasing the heading bug or traffic, you need to taxi above 18 it’s to get the traffic to come alive.

Pilot, A&P and avionics tech here.

[-]

Cheezeball25@reddit

On the CRJ you can absolutely get the traffic to read while still on the ground. And if you're doing a compass swing on a standby compass on a CRJ, you taxi in a circle, pointing at each cardinal direction, and adjusting the error. I doubt this is a compass swing for the magnetic flux detectors, since I don't see anyone outside verifying the heading with a standalone reference compass. But my money is this is definitely a compass swing.

-CRJ avionics technician

[-]

SomeLostBeing@reddit (OP)

I did start the video quite late in, I didn’t realize he was doin circle for at least 3 or 4 minutes until I started the video, and even then that lasted like another 10+ minutes until I had to go, but I know nothing technical about planes so I do not know

[-]

Big_daddy_sneeze@reddit

This is a major neurological sign that can indicate rabies

[-]

ShezSteel@reddit

Warming up their tyres

[-]

abz2yyc@reddit

…for qualifiers

[-]

ShezSteel@reddit

Explaining the joke.

It's ok. It's reddit. It's needed.

[-]

abz2yyc@reddit

In motor sport racing (e.g. F1) drivers warm up the tyres to get them into the optimal performance windows.

[-]

Ruining_Ur_Synths@reddit

donuts

[-]

Chasseur_OFRT@reddit

He lost his glasses

[-]

slanderpanther@reddit

You know when roller skaters practice runs with the little orange cones?

[-]

zcomuto@reddit

Donuts

[-]

Farbicus@reddit

It's best.

[-]

shakebakelizard@reddit

It's looking for something it dropped. What could it be?

[-]

jojobdot@reddit

Their best

[-]

ColdStockSweat@reddit

It's turning in circles.

[-]

Fortspucking@reddit

Lost contact lens.

[-]

veritoast@reddit

Clearly trying to pass his motorcycle license exam

[-]

No-Rush396@reddit

It's not looking for somewhere to park, is it? You often see car-owners and drivers doing this, cruising up and down streets looking for an empty car-parking space.

[-]

Shock_a_Maul@reddit

"permission to drift granted. Bet you can't even park it "

[-]

revanzomi@reddit

He's teaching his kid to drive in a parking lot

[-]

whydoesthisitch@reddit

Zoomies

[-]

Southern-Scientist95@reddit

I think the plane has rabies

[-]

Exciting_Turn_9559@reddit

hahahahaha

[-]

PaulMuadDib-Usul@reddit

Warming up the tyres before the red lights go off…

[-]

PowFunky@reddit

warming the tires for when the flag goes green.

[-]

xtsallad@reddit

Heating up the tires.

[-]

Maleficent_Heron_494@reddit

Resync’ing his compass.

[-]

Otomat1911@reddit

Trying to find the a220 babybus

[-]

cagivos@reddit

can be a magnetometer calibration

[-]

Makaron_penne@reddit

The plane had too much coffee and got excited, duhh

[-]

bassthrive@reddit

Needs more “Yakkity Sax”

[-]

3BlindMice1@reddit

This is how they break the guitars. I guess they're filling in for united

[-]

Individual-Switch751@reddit

Ballin’

[-]

Prestigious-Title529@reddit

Trying to pass his driving exam before he can fly

[-]

Throwaway8364265356@reddit

It wants to go for walkies

[-]

RydeOrDyche@reddit

The electric cross feed is inop and they ops checked the gravity cross bleed valve per the mel. Which created an imbalance more than 300lbs and now they’re trying to even out the tanks so they can take off…

Im kidding but I did once have to taxi around to find an area that leveled out the fuel tanks.

[-]

GuardianViolet@reddit

When I was a kid and was told to put my electronics on airplane mode so they woudn't interfere with the plane, this is basically what I thought would happen if I didn't.

[-]

barkingcat@reddit

Donuts!!!

[-]

Bamcfp@reddit

Swangin that mawf

[-]

HockeyPhoenician@reddit

It's circling its bed before laying down for the night. C'mon, you've seen dogs do this

[-]

Disastrous-Wall-6943@reddit

I asked ground for permission to taxi somewhere and then messed up my read back, so now I'm in the penalty box, but I keep messing up the read back so they make me turn around and try again.

I've been here for 3 days and I'm running out of Biscoffs and coffee.

Please send help.

[-]

RastaFarva@reddit

Practicing taxing around O’Hare.

[-]

SharpPhilosopher3734@reddit

Checking weather radar to make a plan for takeoff so they can avoid storms. I have been on jets a few times where they do that.

[-]

Yiqu@reddit

Looking for his ball.

[-]

dr_van_nostren@reddit

Practicing driving

[-]

birdflyingfree@reddit

Zoomies

[-]

ileftmypantsinmexico@reddit

He’s just pacing impatiently waiting for his turn to fly

[-]

T206V70R@reddit

So, their “deviation” is on full display, then it’s documented? That’s what I call swinging.

[-]

danit0ba94@reddit

They don't even know. You think we're gonna know?

But for real it's probably just a compass swing. Looks goofy but it's a common, and approved☝️🤓, practice.

[-]

Muschina@reddit

Yep, compass swing. I can barely believe that Delta still has to do swings on their aircraft, but that damn 717 was originally certified in like 1967. IIRC, it still has the compass over the FO's shoulder that you look at with a couple of little mirrors on the glareshield.

[-]

CouchPotatoFamine@reddit

Having a seizure?

[-]

star_chicken@reddit

Airplane ground agility course

[-]

Raifsnider@reddit

He's been playing too much Forza Horizon 6

[-]

spicypoly@reddit

He swinging that shit fym

[-]

trob1313@reddit

Testing repairs done on the plane.

[-]

forevertheorangemen2@reddit

Donuts

[-]

Number1atp@reddit

My guess someone wrote up nosewheel steering. Or they just replaced the nosewheel steering motor and are ops checking it. Everyone claiming compass swing I have never seen a compass swing done without stopping. I understand it’s timelapse but the aircraft doesn’t appear to stop long enough to let a compass settle and record it.

[-]

1HeyMattJ@reddit

Plane drugs

[-]

Encinitas123@reddit

“More right rudder. I said More Right Rudder! Dang it! MORE RIGHT RUDDER!”

[-]

chrislivingston@reddit

Like dogs, planes circle a few times before lying down for a nap

[-]

Signal-Session-6637@reddit

I thought I was on shittyassflying.

[-]

SomeLostBeing@reddit (OP)

I didn’t even know that was a subreddit until someone shared it earlier, sadly I cannot crosspost over there

[-]

Imprezzed@reddit

Chorus] I wonder if you know How they live in Tokyo If you see me then you mean it Then you know you have to go Fast and furious (Drift, Drift, Drift) Fast and furious (Drift, Drift, Drift) I wonder if you know How they live in Tokyo If you see me then you mean it Then you know you have to go Fast and furious (Drift, Drift, Drift) Fast and furious (Drift, Drift, Drift)

[-]

planty_mx@reddit

He’s got the zoomies

[-]

elquirk@reddit

Training a new pilot to taxi and stick to the lines. Harder than it looks.

[-]

Ficsit-Incorporated@reddit

Taking the plane out for a walk. It needs some exercise and enrichment or it goes stir crazy and pees on the goddamn rug again.

[-]

lechiengrand@reddit

This must be a hunting ~~breed~~ model - gotta sniff everything.

[-]

Severe_Heron_9304@reddit

Won the championship and is doing donuts

[-]

thatCdnplaneguy@reddit

Compass swings usually involve sitting still to verify the aircraft compass against an external one. This might be testing the steering after a repair

[-]

MrPigeon70@reddit

Poor thing, has chronic wasting disease...

/j

[-]

CPD1960@reddit

Not convinced it is really going that speed

[-]

SomeLostBeing@reddit (OP)

it’s not, this is a timelapse of around 10-15 minutes

[-]

CPD1960@reddit

😊

[-]

Memitim@reddit

It's called style, bitch. Haters gonna hate when my tail goes swish swish swish swish swish.

[-]

mattincalif@reddit

Someone needs to ask for directions.

[-]

NumisKing@reddit

Keeping the baby asleep.

[-]

ReclusiveLegion@reddit

Plane rabies.

[-]

Impressive_Okra_2913@reddit

Zoomies!

[-]

Mr_Sia10@reddit

Figure 8 competition

[-]

Boring-Entrance-2881@reddit

Runway take over, these side shows are getting out of hand

[-]

Personal-Ad4554@reddit

Zoomies

[-]

VHSVoyage@reddit

Drugs

[-]

FalseDifficulty2340@reddit

Whipping shitties

[-]

D70192@reddit

It's a plane mating dance. Male planes use this activity to attract a mate and make more planes.

[-]

Highspeedfutzi@reddit

Something like this? : https://youtu.be/Slei8n08Cqk?si=5JxQSqhfdxbsa7OR&t=155

[-]

WolfThick@reddit

They could be looking for some kind of a noise in the hydraulic actuators for steering maybe there's a fuel sensor that's not reading right and they're trying to trigger it to see if it's just stuck.

[-]

Soggy_Fly6732@reddit

It’s a sign he has rabies, that’s not commmon behavior for a plane

[-]

skbum2@reddit

Going our for autocross? I'm thinking that'd still be H -street. Great in a straight line but so slow in the corners...

[-]

deadsantaclaus@reddit

The first officer just picked up a Nissan 200sx for drifting. He is showing the cabin crew his new found skillz?

[-]

notarobat@reddit

This is typical for an aircraft that is in heat

[-]

wheresjim@reddit

He’s got the zoomies

[-]

maloikAZ@reddit

Probably reprogramming a nav system.

[-]

AdApprehensive1140@reddit

What’s our Vector, Victor?

[-]

daygloviking@reddit

Compass swing

[-]

ThaddeusMuscles@reddit

Whipping shitties

[-]

amazingmaple@reddit

Donuts

[-]

Asleep_Pollution_140@reddit

Doughnuts in plane, legend!

[-]

Highspeedfutzi@reddit

Holding pattern

[-]

planetary_retrograde@reddit

new boot goofin!

[-]

relativityboy@reddit

This reminds me of the compass/gyro calibration you used to have to do on old android phones. Anyone else remember this

[-]

VolSpurs74@reddit

It’s Knoxville, anything is possible. It could be a compass check, or he could be trying to locate a meth dealer or an evangelical church. Who knows?

[-]

canadanfil@reddit

Transfering fuel using the Gravity Crossfeed. /s

[-]

RhymzwithOrangz@reddit

Drivin to the liqa store

[-]

nl_Kapparrian@reddit

Driving their plane obviously

[-]

Skeetronic@reddit

Warming up the tires for the big race

[-]

MeMilo1209@reddit

Donuts

[-]

Montana_Red@reddit

Spinning brodies.

[-]

ikothsowe@reddit

Warming his tyres for better traction.

[-]

Trityler@reddit

This could be a sign that the plane is rabid. Jet Rabies is endemic to the regional jet population, and when they loop around like this you definitely need to be concerned for that. Though its also possible that it is just an older jet near the end of its service life and is having some sort of wiring issue. Don't take any chances though. If you have any pet jets or helicopters at home, it would probably be a good idea to keep them inside for a bit. If you see it again, I would call your local Air Traffic Control so they can send out a professional to capture it safely.

[-]

Fun-Palpitation3968@reddit

A pilot who is retiring and wanted to go out with a bang?

[-]

thejdobs@reddit

One of the mechanics is letting their kid sit on their lap and drive for a bit

[-]

NarrowExtension1704@reddit

Espeeeeeeene

[-]

ScottOld@reddit

Pilots taking the plane out to do some doughnuts

[-]

Scared_Expression726@reddit

He's doing his driving test!

[-]

dontlookatmreee@reddit

Man speeding the video up really fucked my brain up. Thought it was AI until read the comments

[-]

intrepid_mouse1@reddit

Donuts

[-]

dubgeek@reddit

New Motorsport spinoff- Aerocross

[-]

hundredgrandpappy@reddit

Sniffing for the perfect pee spot.

[-]

CollectionLoose5928@reddit

Probably a young pilot getting ground taxis qualified

[-]

lobo_noble@reddit

Calienta la banda

[-]

afortressmighty@reddit

Whippin’ shitties, dontcha know? 😉

[-]

cgw1965@reddit

Sideshow practice.

[-]

mlenotyou@reddit

Donuts

[-]

valdocs_user@reddit

Crosspost this to r/shittyaskflying

[-]

SomeLostBeing@reddit (OP)

can’t sadly

[-]

FetteBeuteHoch2@reddit

remember those times when you were a kid and your dad lets you drive? This is the pilot version of that.

[-]

CockedStriker@reddit

Is this sped up? My first reaction was to accuse it as AI 🤣

[-]

SomeLostBeing@reddit (OP)

it is a timelapse

[-]

CockedStriker@reddit

Ah okay. Makes sense. Your filming was so steady I couldn't tell from the camera movement haha

[-]

SomeLostBeing@reddit (OP)

it was just mounted on my dad’s dashboard while i was waiting around lol

[-]

CommunicationOwn6940@reddit

It’s called Listeriosis. When the plane stops eating and starts to drool, that’s when you know its time is near.

[-]

justinhj@reddit

Pilot dropped his house keys on the runway

[-]

ViolettaQueso@reddit

They got the new guy strapped in the rear of the plane for initiation.

[-]

Ok-Sprinkles-5151@reddit

Defense sive driving course. The pilot is learning how to protect against budget airline pilots

[-]

quakefiend@reddit

My guess is maintenance is doing something. Maybe testing nosewheel steering or AHRS. or sideshow burnouts, probably

[-]

Ok_Bottle_7568@reddit

Having fun

[-]

PersonalAd2039@reddit

Do you need a pilots license if you’re just driving a plane around??

[-]

Brilliant_Net1907@reddit

The Delta dance. Passengers pay extra to be part of it.

[-]

DIJames6@reddit

Runway takeover like they do with Infinities in the street.. Other planes just didn't show up yet..

[-]

rothwerx@reddit

Zoomies

[-]

philipjfry1578@reddit

I saw this the other day at work, I was so confused lol. I guess there is an actual point of doing this

[-]

DIJames6@reddit

Parallel parking sucks.. Lol..

[-]

VR46_69@reddit

I paced around a lot before my first child was born too.

[-]

youplab00m-milo@reddit

Crazy Ivan

[-]

Snicklefried@reddit

When you Google "How to fly"...

[-]

Snicklefried@reddit

Slaom

[-]

ginsujitsu@reddit

Zoomies

[-]

thetruesupergenius@reddit

They're going around. Duh!

[-]

AveragePolishFurry@reddit

Doin it for shits 'n giggles

[-]

Aerofirefighter@reddit

Forget autocross….aerocross

[-]

sscreric@reddit

having fun

[-]

Brofessor-0ak@reddit

You weren’t supposed to see this.

We actually don’t have the ability to fly. This is just what it looks like on the outside when there’s turbulence.

I’ve said too much. They know

[-]

Beautiful-Mango-9612@reddit

The pilot has been watching too much MSFS2024 AI traffic.

[-]

OneThotOneKill@reddit

Probably saying "wheee!!"

[-]

Av8Xx@reddit

my guess, taxi training but might be a compass swing. look at google earth for that part of the airport see if there are marking for compass swing.

[-]

BerylVanguard@reddit

Driving lessons for their test at the DMV tomorrow.

[-]

ZealousidealGrab1827@reddit

The elusive mating ritual captured on video. Congrats!

[-]

Olliew89@reddit

Zoomies!

[-]

Maddogicus9@reddit

Boxing the compass

[-]

maitshee@reddit

It’s doing it’s very best in these trying times

[-]

I_Like_Chasing_Cars@reddit

Cirrus parking lot has a great view

[-]

SomeLostBeing@reddit (OP)

exactly, I was waiting for my dad to get out of work and I looked up from my phone and saw this happening

[-]

SomeLostBeing@reddit (OP)

My family is loving these comments

[-]

malachite_animus@reddit

Zoomies

[-]

kilaueasteve@reddit

Got the zombies after a bath

[-]

SomeLostBeing@reddit (OP)

it was just raining!

[-]

SomeLostBeing@reddit (OP)

it’s just spend up is all

[-]