The aircraft was intending to land at a private airstrip but the pilot was unable to obtain a green down-and-locked cockpit indication for the left Main Landing Gear (MLG). He returned to Durham Tees Valley Airport where, despite several attempts, he was still unable to receive confirmation that the gear was locked down. The emergency extension system was used but, during the subsequent landing roll, the left MLG collapsed.
It was found that a combination of factors, including corrosion and a lack of lubrication had led to stiffness in the downlock mechanism such that it would not lock the gear down fully after free-falling under gravity following emergency extension. The electric pump which supplies hydraulic power under normal gear extension/retraction had burnt out.
Piper PA-34-200T Seneca II G-CLUE 09-14.pdf (269.71 kb)