Event Description
During the approach for landing, the landing gear was extended. The right main landing gear indicator light began flashing, and an unsafe gear warning activated. The crew made several attempts to ensure the gear was properly extended, including repeated use of normal and emergency gear extension procedures. Despite these efforts, upon touchdown, the right main landing gear collapsed.
Examination Findings
A subsequent examination of the aircraft revealed that a cotter pin on the right main landing gear scissors was in an open position. This open cotter pin had caught a wiring bundle within the wheel well, which interfered with the down lock mechanism. The obstruction prevented the down lock from engaging, leading to the gear not being locked in the extended position.
Probable Cause
The accident investigation identified that the right main landing gear collapsed because a cotter pin on the scissors was open and caught a wiring bundle, preventing the down lock from engaging.