SDR CALA2019082301425

Service difficulty report · Warning Message · Boeing 767322

Difficulty date: August 22, 2019
Submitted: August 23, 2019
Operation: Air carrier
Aircraft: N656UA
Make and model: Boeing 767322
Aircraft serial: 25394
Aircraft time: 108,021 hours, 16,659 cycles
System (JASC): 2731 · Elevator Tab Control System
Part: Warning Message
Condition: False Activation
Location: Horizontal Stab
Stage of operation: CR
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

HORIZONTAL STABILIZER TRIM CONTROL SYSTEM EICAS MESSAGE, UNSCHED STAB TRIM DISPLAYED, UNSCHED STAB TRIM LGT ON WITH AUTOPILOT OFF. NEITHER STAB TRIM CUTOUT SWITCH RE-ESTABLISHED CONTROLLED STAB TRIM, ONLY RECEIVED THE MESSAGE WHEN USING ALTERNATE TRIM SWITCHES. NO FAULT USING CONTROL WHEEL TRIM SWS. WHEN HAND FLYING. PERFORMED FIM TASK 27-09-00-815-813, PERFORMED TEST 65, NO FAULTS NOTED, TEST PASSED. PERFORMED TEST 30, TEST PASSED, NO FAULTS. AIRCRAFT REMAINS FULL CAPABILITY.