SDR 98ZZZX1926

Service difficulty report · Actuator · Beech 76

Difficulty date: April 22, 1998
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N6717Y
Make and model: Beech 76
Aircraft serial: ME331
System (JASC): 2752 · Trailing Edge Flap Actuator
Part: Actuator
Part number: 169524071101
Condition: Failed
Location: Flap
Part time: 3,900 hours
Stage of operation: NR
Nature of condition: F
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING FLAP EXTENSION, PILOT HEARD LOUD 'POP' FROM UNDER REAR SEAT AREA, AND FLAPS SNAPPED UP TO FULLY RETRACTED POSITION. INSPECTION REVEALED THAT FLAP ACTUATOR TUBE ASSY (ITEM 33 ON ATTACHED) HAD UN-THREADED FROM BALL NUT ON JACK SCREW. UNIT RE-ASSEMBLED, LUBED AND INSPECTED, OPS CHECKS GOOD. RECOMMEND MODIFICATION TO TUBE ASSY BY INSTALLATION OF ALLEN TYPE SET SCREW.

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