Overspeed warning in big jet
Posted by abkyy@reddit | flying | View on Reddit | 13 comments
Hi Does situations where during approach pilots selected flaps while aircraft was going too fast, what caused overspeed warning? If yes, what is a procedure in these case? Does aircraft gets a technical inspection? What happens to pilots, do they get some kind of training session? I'am Talking especially about big jets eg a320 or 737
-LordDarkHelmet-@reddit
Yeah it happens. Not a big deal. On my Airplane if the over speed is 10 knots or less it’s just a visual inspection within 7 days. Over 10 knots and the airplane is grounded. Never heard of a pilot getting in trouble for that. I do know the company tracks it, as it was highlighted in a quarterly safety briefing along with some graphs and trends.
Designer_Buy_1650@reddit
If your airline has a FOQA program, it’s important to self report your over speed in addition to a logbook write up. I’m pretty sure overspeeds are one of the parameters recorded.
JT-Av8or@reddit
Sure. Several times per year. The procedure is to write it up in the logbook and have MX do their inspection. It depends on what got oversped, by how much and how long. 5 knots? Not an issue. In fact when I was an acceptance pilot we’d intentionally overspeed everything by 5 knots to test the overspeed warnings. All those speeds are padded so a few knots doesn’t matter. Some planes have auto retract for things like flaps, where they’ll pull back from say 25 degrees up to 20 until the plane slows down again and then they’ll re-extend to 25. Still requires a logbook entry.
What happens to us? Nothing. Unless there’s some kind of damage, then crews might have to go back and do sim retraining. I’ve never heard of anyone intentionally breaking a jet though. Usually it’s something like extending the flap handle and missing a detent, accidentally going too far for a second and then reversing. Or hitting the Mach limit in a decent for a few seconds because the ride hit a little turbulence out of nowhere. Everyone is a professional.
tzincp@reddit
The auto retract thing is called flap load alleviation on the Boeing models that have it, not all of them do. 737, 757, 767 and I belive 747 have fully mechanical flaps. On those models the FSEU is used for indication only. 777 and 787 (the LRU that controls this is called FCE on 787) do have this logic. Fun fact...
Flyby4702@reddit
The MAX’s have the load relief. They keep tripping up our crews for stabilization criteria- they’ll select flaps 30 (or 40) and be configured prior to 1,000, then get a tad fast, flaps retract some minor degree, then take a while to re deploy, and FOQA captures the non-configuration below 1,000. Kind of annoying.
Apprehensive_Cost937@reddit
Annoying, but flap load relief below the landing gate normally requires a go-around anyway.
grumpycfi@reddit
The 737, 757, and 767 all have flap load relief.
tzincp@reddit
I am an idiot, I thank you.
Yes I just looked up the schematics to confirm, controls cables from the flap lever go to an electrically driven load relief actuator controlled by the FSEU. Each model has a different load relief schedule. This is disabled in alternate mode.
JPAV8R@reddit
Flap load relief is not available at all flap settings.
Joe_Littles@reddit
A320 also has an auto retract of the flaps in the 1+F setting.
CulturalStick3405@reddit
Write it up and move on
LawManActual@reddit
320 driver.
Yes, an over speed warning is generated.
Not really a specific procedure other than slow down, which can be accomplished a few ways. The over speed will be written up in the logbook and Mx will do an inspection. Most times it’s a walk around and cycling the flaps.
What happens to the pilots is they’ll be contacted by FOQA, (flight operations quality assurance, I believe it is) who will ask what happened, and they collect the data from the flight. It’s probably going to end there. People make mistakes.
rFlyingTower@reddit
This is a copy of the original post body for posterity:
Hi Does situations where during approach pilots selected flaps while aircraft was going too fast, what caused overspeed warning? If yes, what is a procedure in these case? Does aircraft gets a technical inspection? What happens to pilots, do they get some kind of training session? I'am Talking especially about big jets eg a320 or 737
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