SDR UALA2011122107002

Service difficulty report · Trim Panel · Boeing 747422

Difficulty date: December 18, 2011
Submitted: December 22, 2011
Operation: Air carrier
Aircraft: N171UA
Make and model: Boeing 747422
Aircraft serial: 24322
Aircraft time: 83,970 hours, 10,000 cycles
Engine: Pwa PW4056
System (JASC): 2721 · Rudder Tab Control System
Part: Trim Panel
Condition: Misinstalled
Location: Rudder
Stage of operation: IN
How discovered: V
Nature of condition: W
Precautionary procedure: K

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

What was found

RUDDER AND AILERON TRIM PANEL IS INSTALLED THE WRONG WAY AND USE OF TRIM IS OPPOSITE OF WHA FOUND AIL, RUD TRM CTL PANEL MOUNTED UP SIDE DOWN AND TRIM INDICATOR IN WRONG POSITION AS STATED. REMOVED AIL, RUD TRIM CTL PANEL TO CORRECT CONFIGURATION AND RELOCATED TRIM INDICATOR TO PROPER POSITIONS PER AMM. SYSTEMS OP CK OK. ITEM SHOULD READ REMOVED AND REPLACED AILERON & RUDDER TRIM CONTROL MODULE PER AMM AND REMOVED AND REPLACED RUDDER TRIM INDICATOR PER AMM. SYSTEMS OP CK OK.