Squawk Box

August 2013 Issue

Plugged, Stiff, Broken

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.

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.

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