Cessna; Model 340A; Failure of the Trailing Edge Flap-Limit Switch;

Cessna; Model 340A; Failure of the Trailing Edge Flap-Limit Switch;

The pilot landed the aircraft and retracted the flaps during taxiing. The up-limit switch (P/N BZ-7RWT80) failed to stop the flaps at their up limit. Both chains attached to the flap cables were broken or damaged. Several operating rods were damaged and a pulley was pulled out of its mount.

According to the submitter, the probable cause of the problem was that the cam and the up-limit switch were slightly out of rig and allowed the flap gearbox to overrun. He stated that paying closer attention to the functioning and rigging of the flap system might prevent a costly repair.

Part total time-2,781 hours.

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