A330 gear doors after abnormal gear extension

[Check Airman]

Hi,

I just saw this youtube video. The crew had a hydraulic failure that required alternate gear extension. Shortly after touchdown, the main gear doors appear to partially retract, before falling open again. Can any 330 drivers explain why? From the camera angle, it looks like the doors actually toughed the runway, but I doubt it.

https://youtu.be/itg7FRTDLdM timestamp at ~1:30



Avherald article

[6f1]

Check Airman

I had a green hydraulics failure some years ago in ORD with emergency gear extension,the doors do not touch the runway they float in the airflow although there seems to be no reference in the FCOM.

[Goldenrivett]

Hi Check Airman,

Thanks for the link. It does look like the doors are bounced upwards by ground contact. Apparently there is only 0.23m (9 inches in old money) ground clearance with doors open. http://nata.aero/agso/ASTGCache/ae6c...2234d81ff8.pdf Page 95.

How much compression travel is there on the main gear oleos?

[flyingchanges]

Looks to me like the doors moved as they went into reverse.

[Amadis of Gaul]

Originally Posted by Goldenrivett

Hi Check Airman,

Thanks for the link. It does look like the doors are bounced upwards by ground contact. Apparently there is only 0.23m (9 inches in old money) ground clearance with doors open.

How much compression travel is there on the main gear oleos?

7.3in +/- a tad.

[Check Airman]

looks like the reverser airflow is the most plausible. the reversers look like they're a but in front of the doors though, but I suppose the airflow is doing funny things with the interference of the fuselage.