SDR AALA201907029013

Service difficulty report · Servo Motor · Boeing 737823

Difficulty date: July 1, 2019
Submitted: July 5, 2019
Operation: Air carrier
Aircraft: N932AN
Make and model: Boeing 737823
Aircraft serial: 29530
Aircraft time: 56,253 hours, 23,544 cycles
System (JASC): 2230 · Auto Throttle System
Part: Servo Motor
Part serial: AS06193
Condition: Faulted
Location: Zone 200
Stage of operation: CL
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

AIRCRAFT WAS GROUNDED: PILOT REPORTS SHORTLY AFTER TAKEOFF, AUTOTHROTTLE ARM SWITCHED OFF. WHEN RESET TO ARM, SWITCH WILL ONLY REMAIN ON FOR A FEW SECONDS. MAINTENANCE PERFORMED BITE CHECK OF AUTO THROTTLE COMPUTER IAW FIM 22-31-00-810-801. NO FAULTS NOTED. IN FLT FAULTS SHOWED ASM 2 FAULTED. DUE TO FAULT HISTORY, AS A PRECAUTIONARY, REMOVED & REPLACED ASM 2 IAW AMM 22-31-91. SERVO MOTOR OPS TEST GOOD IAW AMM 22-31-00.