Plugged, Stiff, Broken

Before the second landing, the crew selected gear down, which showed down and locked, but the crew saw and smelled smoke. The landing gear circuit breaker tripped after gear completed cycle. Inspection confirmed source of smoke was from the landing gear actuator motor and a faulty dynamic brake relay (mfr p/n SM50D7) is suspected to have caused the landing gear motor to overtravel against hard stop and smoke.

Editorial Staff

Friday, July 19, 2013 at 12:00 AM ET

Verified

Key Takeaways:

Multiple aircraft experienced critical system failures, including a faulty landing gear relay, a plugged fuel vent system causing engine power loss, and failed landing gear fasteners leading to gear collapse.
Engine component issues were also reported, such as a stiff magneto bearing preventing engine start and a broken spark plug electrode discovered during inspection, indicating diverse mechanical integrity challenges.

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Beechcraft F33A Bonanza
Failed Landing Gear Relay
Before the second landing, the crew selected gear down, which showed down and locked, but the crew saw and smelled smoke. The landing gear circuit breaker tripped after gear completed cycle. Inspection confirmed source of smoke was from the landing gear actuator motor and a faulty dynamic brake relay (mfr p/n SM50D7) is suspected to have caused the landing gear motor to overtravel against hard stop and smoke.
Part Total Time: 142 hours