Incident Overview
The pilot reported that the landing gear did not extend on final approach, and attempts to obtain a safe gear indication using both normal and emergency extension procedures were unsuccessful. A 38-knot left crosswind component existed for the landing, exceeding the airplane's maximum demonstrated crosswind of 18 knots.
Landing and Collapse
During the landing roll, the right main gear collapsed, and the aircraft departed the right side of the runway.
Post-Accident Inspection
A post-accident inspection revealed that a nylon wire tie securing the throttle cable had broken. Additionally, a hole had been chafed in the hydraulic pressure outlet line between the main hydraulic power pack and the landing gear selector valve. The chafed hole was located in the area where the unsecured throttle cable contacted the hydraulic line.
The hydraulic line had been repaired in 1980 by splicing in an additional piece, making it 1/2 inch longer than a new hydraulic line. When a new hydraulic line was subsequently installed, it had adequate clearance with the throttle cable.