Wheels up landing involving a Piper PA-31-350, VH-KIJ, King Island, Tasmania, on 10 June 1993

During the landing roll the right landing gear collapsed. The pilot reported that the indication was that the gear was locked down prior to the landing gear collapse.

Prior to this flight the aircraft had undergone maintenance which included some work on the right main landing gear. While damage to the components of the collapsed gear precluded assessment of the downlock switch settings, it is likely that incorrect adjustment of the switch allowed the hydraulic power pack to be switched off before the right main gear was properly down and locked.

As a consequence, it is probable that the aircraft was landed with the right main gear not locked down, although the cockpit indication was that the gear was locked down.