Airbus limits cold-weather takeoffs with Pratt & Whitney engines
Posted by swordfi2@reddit | aviation | View on Reddit | 39 comments
PW bruh
Posted by swordfi2@reddit | aviation | View on Reddit | 39 comments
PW bruh
Bramxis@reddit
Whoa, cold weather grounding flights? That's a real buzzkill for travelers.
Bramxis@reddit
Whoa, PW engines finally getting some coldaweather love? About time!
Bramxis@reddit
Whoa, aviation drama and a $59M online scam? Wild day on Reddit.
Friendlybroseidon@reddit
Article mentions the 320 versions, not the a220 pw1500? Interesting. Must but those super hot combustion chambers keeping it toasty on take off.
COW321@reddit
A220 too
slowpoke2018@reddit
Not an expert, but wouldn't having the same motors on the 220 as the 320 make the former sort of a Rocketship?
TheMandalorianTV@reddit
Was on an A220 recently, plane was half full, pilot entered runway at like the middle of the runway and took off, the angle was crazy too! It really is a rocketship.
ModsHaveHUGEcocks@reddit
I'm no plane engineer but can't see why they don't just chuck a pair of GE9X on the a220. That would be sweet
ma33a@reddit
I reckon you could fit an a220 inside a GE9X with room to spare.
scottydg@reddit
A220 fuse max diameter: 3.5m A220 fuse diameter at the seats: 3.3m
GE9X fan diameter: 3.4m
9X max OD: 4.4m
Close! The A220 isn't round, similar to the other composite planes, the 787 and A350, so you can slice it either way. The nacelle is far larger, however.
ModsHaveHUGEcocks@reddit
So you're saying there's a chance..
ma33a@reddit
Only if you rephrase it, you aren't chucking a pair of GE9X on an A220, you are chucking an A220 on a pair of GE9X.
Its going to look like a pod racer from Starwars.
ModsHaveHUGEcocks@reddit
Sounds great when can we start?
abn1304@reddit
A120: the fuselage is just a GE9X. No wing engines.
basilect@reddit
However much they're bypassing, there's always an opportunity to bypass some more.
r0verandout@reddit
During the test program we had the 25k rated version on the CS100 variant, which was never a spec planned for service. Takeoff pitch attitudes in excess of 25° were not uncommon...
BullionSeeker@reddit
The 220 engine is based on the same engine architecture, sized for the A220
FZ_Milkshake@reddit
It's so infuriating, for decades now we've been trying to make a large geared turbofan work, because the advantages are obvious. And now P&W got the geared part right, no problems whatsoever with that, but they seem to have ballsed up almost everything else.
TheAlmightySnark@reddit
just PW things really, theyve been trying to make these engines work for a decade now and it is just one AD after the other.
poplap1700@reddit
What does AD stand for?
Prestigious-Elk-9061@reddit
Airworthiness Directive. They’re regulations issued to address an unsafe condition after it’s found.
JustAnotherDude1990@reddit
Random - are you British?
FrankReynoldsCPA@reddit
Or Jim Beaver
Dexcerides@reddit
Damn the British hated that comment
JustAnotherDude1990@reddit
Guess so.
The “ballsed up” made me wonder.
bugkiller59@reddit
100…
theonion513@reddit
How could Being do this?
FrankReynoldsCPA@reddit
You're right, Boeing would have never brought it up.
They'd have waited until a couple planes crashed.
Shadowhawke787@reddit
There already was a restriction on operations in FZFG below-18c on the A220.
So adding visibility to that restriction doesn't seem like a massive change. Also FZFG below-18c or 150M vis is highly unlikely. Probably might impact 1 flight in the next 5 years.
Source: Aircraft Operations Manual.
Approaching_Dick@reddit
Can anyone explain how the engines can be affected by tiny freezing droplets of fog but be otherwise fine with heavy ingestion of water?
Only_Razzmatazz_4498@reddit
Water droplets are big and heavy and are usually mostly pushed outwards by inertia so they don’t go into the core that much. Fog on the other hand is very light so it goes together with the air. Why it would be a problem I am not sure since compression usually warms the air up pushing it away from saturation and freezing unless maybe ice is deposited on the first stage compressor blades before they warm up enough and then is shed into ice chunks that damage blades. Just spitballing and guessing lol.
Hefty-Inevitable-660@reddit
Ice builds up on inlet then sheds chunks into the engine
Only_Razzmatazz_4498@reddit
Right but that the normal process and the belt is heated in icing conditions to avoid that. I mean it’s possible Pratt and Whiskey got that wrong but it is pretty standard.
SubarcticFarmer@reddit
The cowl lip and inner edge is heated, not the rest of the front of the engine like nose cone etc
Only_Razzmatazz_4498@reddit
That makes sense but it would be hard for large chunks to form on the rotating parts no? I guess the center of the cone is going slow enough maybe. That’s why the only area I could thing of would be the first set of vanes before they warm up.
SubarcticFarmer@reddit
The first set of blades aren't heated. You can get icing on those or the nose cone. It is most common on the ground where the engines tend to be at idle for longer stretches and usually the solution is periodic engine runups. It can happen in flight as well though in the right conditions and once again the solution is to keep the rpms up. You see it indicated by vibration (the engines have vibration gauges).
Momsfartbox@reddit
The condition is super cooled water vaper, instantly sticks to surfaces. The one surfaces you don't want this to happen to is the inlet cowling. Ice will build up and cause a stall. This actually happened early on with 747-8 with GEnx 2b engines because the aircraft was not designed with BAI/IAI system.
tambrico@reddit
How long have these engines been in use that this has only happened once?
Mbizzy222@reddit
I believe all the models listed use the P&W Geared Turbofan (GTF) engines which have been somewhat problematic