Airframe event involving a Cessna 421B, VH-YRK, Walgett, New South Wales, on 20 July 1993

The pilot reported that he selected gear down when established inbound on the approach and noted three green lights. He stated that he rechecked the gear indications on short final and again confirmed three greens. After a normal touchdown was accomplished, the nosewheel was lowered onto the runway and braking was commenced. The right hand side of the aircraft dropped slightly, the aircraft veered right, and the pilot assumed that the right hand tyre had blown. The right hand gear then collapsed and the propellor hit the ground.

The gear collapse was due to mechanical failure of the bell crank fitting, which then allowed the side brace locking mechanism to become unlocked.