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:

Several aircraft experienced critical mechanical failures, including collapsed landing gear due to failed fasteners and a faulty dynamic brake relay causing landing gear motor overtravel and smoke.
Engine and fuel system issues were reported, such as a plugged fuel vent system leading to engine power loss, a stiff magneto bearing preventing engine start, and a broken spark plug electrode.

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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