|Quoting GST (Reply 8):|
I believe that was only the conventionally inward folding outer gear. And besides, they established that when the aircraft is in flight the airflow around the gear will stop it jamming when opening for some reason. Regardless, I do believe there was some fix Incorporated into the design of the undercarriage for this for the production aircraft.
From what I remember, the initial static test failed on the "folding" gear. The weight of the gear was supposed to force the doors open, but there was a point where the tyres got hung up and stuck on the door. The initial fix for the static test was to simply place a shedload of grease on the inside of the landing bay door so that the tyre would still be able to force the door open!
(I kid you not, and it worked like a charm)
Then once it was established that that it was only a very minor change that was needed, from what I remember, they "tweaked" the inside of the door.
As GST stated, they were confident however that once airborne, the airflow would ensure that the landing gear would drop under gravity even without the "tweaks"
Also I think that the "upward" moving gear (rather than the folding gear) have to move down first before they can move up, thus preventing them from being retracted on the ground.