SDR ASMF201109009

Service difficulty report · Gearbox · Boeing 73781Q

Difficulty date: September 23, 2011
Submitted: October 4, 2011
Operation: Air carrier
Aircraft: N520AM
Make and model: Boeing 73781Q
Aircraft serial: 29052
Aircraft time: 32,896 hours, 11,104 cycles
System (JASC): 2740 · Stabilizer Control System
Part: Gearbox
Condition: Lack Of Lube
Location: Stab Trim
Stage of operation: AP
How discovered: O
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

CAPTAIN REPORTED THAT DURING APPROACH, THE STABILIZER TRIM WITH HIGH VIBRATION AND SOUND. MX PERSONNEL WAS PERFORMED THE FIM 27-41-00 TASK 803 / 804 PROCEDURE, CONFIRMING THE FAILURE. ACFT WAS SENT TO THE HANGAR AND THE HORIZ STABILIZER CONTROL SYS WAS CHECKED IAW MM 27-41-00, DETECTING STUCK THE GEARBOX; SO THE HORIZ STABILIZER JACKSCREW, BALL NUT AND UPPER GIMBAL WERE LUBRICATED AND TESTED IAW MM 12-22-41 AND MM 27-41-00, ALL CORRECT.

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