Second, their nose wheel had failed to lock into place during the gravity drop.

第二，在重力下降过程中，前轮未能锁定到位。

As they were getting close to the old runway that's now a drag strip, they used a gravity drop to force the landing gear down without using any power.

当他们靠近双车短程赛车道时，他们不使用任何动力，仅靠重力迫使起落架下降。