A220 on the grass
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gotoPzero

Original Poster:

20,193 posts

214 months

Sunday 17th May
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Looked like it could have been a bad incident - must have happened a second before Vr.


Familymad

2,074 posts

242 months

Sunday 17th May
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“When experiencing a loss of directional control on a wet runway, immediately cancel reverse thrust to idle and adjust the brakes. Full reverse thrust, particularly with asymmetrical deployment or crosswinds, can cause the aircraft to weathercock, slide sideways, or skid due to rudder airflow disruption and asymmetrical side forces.”

Would have probably snapped straight, but you’d have to hope the wheel brakes would have retarded it enough in those surface conditions.

gotoPzero

Original Poster:

20,193 posts

214 months

Sunday 17th May
quotequote all
I have a feeling two things happened. First the "oh fudge" moment when the view went from grey tarmac to green grass which had that startle reaction and second they were going so fast at that point that they were probably going for the ride anyway with the wet surface etc. I expect there was some level of "I cant do that Dave" from the flight computers given the control inputs you can see happening on the wings and the braking action on the wet grass.

Super interesting situation though and would love to see some photos of the fan blades!

seabod91

977 posts

87 months

Sunday 17th May
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Amazingly handled by the pilot.

No1 engine quit just before v1 which sent them grass ways. Can see the no1 engine is completely dead and reverse thrust was actually helping to pull them back on track.

Could have been a lot worse.

eccles

14,259 posts

247 months

Sunday 17th May
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Familymad said:


Would have probably snapped straight, but you d have to hope the wheel brakes would have retarded it enough in those surface conditions.
Many tons of aircraft on wet grass? The wheel brakes will have been next to useless without thrust reverse to help them.

Starfighter

5,318 posts

203 months

Monday 18th May
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Flightradar24 reports the max speed at 131 knots, that has to be around v1 so a very last minute rejection.

The video does appear to show a partial rotate and engine 1 does not appear to be providing thrust. Engine 1 failure?

The is also asymmetry on the secondary flight controls / spoilers.

gotoPzero

Original Poster:

20,193 posts

214 months

Monday 18th May
quotequote all
Its all very interesting I think the report will show things happened very quickly, probably even at the same time.

What worries me more is why did it deviate so far so fast. These aircraft are built to deal with engine failure at v1 at MTOW so really it should have remained a bit more stable. If you watch the airbus tests you usually see a big rudder movement but the aircraft stay fairly straight.

Crumpet

5,141 posts

205 months

Monday 18th May
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gotoPzero said:
Its all very interesting I think the report will show things happened very quickly, probably even at the same time.

What worries me more is why did it deviate so far so fast. These aircraft are built to deal with engine failure at v1 at MTOW so really it should have remained a bit more stable. If you watch the airbus tests you usually see a big rudder movement but the aircraft stay fairly straight.
If you’re going solely off the video it looks like no rudder input to keep it on the centreline but with full right aileron. The brain resorts to all sorts of ‘defaults’ under pressure and it wouldn’t be hard to believe that some may try to steer it onto the centreline like it’s a car. I’ve seen all sorts in the sim as there are, as you’d expect, all sorts of levels of ability and experience.

Not saying that’s the case here. But if you asked me what it would look like if you had an engine failure just before V1 and the pilot not react immediately and retard the thrust levers and use the rudders to keep it on the centreline, well I’d say it would look something like this.

Could well be totally wrong but at that speed it should be well above minimum control speed on the ground and a boot full of rudder should have kept it on the centreline. Even if you’d not retarded the thrust levers you could probably have still accelerated through Vr and gone airborne!

butchstewie

64,882 posts

235 months

gotoPzero

Original Poster:

20,193 posts

214 months

Monday 18th May
quotequote all
Crumpet said:
gotoPzero said:
Its all very interesting I think the report will show things happened very quickly, probably even at the same time.

What worries me more is why did it deviate so far so fast. These aircraft are built to deal with engine failure at v1 at MTOW so really it should have remained a bit more stable. If you watch the airbus tests you usually see a big rudder movement but the aircraft stay fairly straight.
If you re going solely off the video it looks like no rudder input to keep it on the centreline but with full right aileron. The brain resorts to all sorts of defaults under pressure and it wouldn t be hard to believe that some may try to steer it onto the centreline like it s a car. I ve seen all sorts in the sim as there are, as you d expect, all sorts of levels of ability and experience.

Not saying that s the case here. But if you asked me what it would look like if you had an engine failure just before V1 and the pilot not react immediately and retard the thrust levers and use the rudders to keep it on the centreline, well I d say it would look something like this.

Could well be totally wrong but at that speed it should be well above minimum control speed on the ground and a boot full of rudder should have kept it on the centreline. Even if you d not retarded the thrust levers you could probably have still accelerated through Vr and gone airborne!
You have written it better than how I did but thats basically what I was trying to say on all the test flights I have seen there is always a big rudder input.