SDR UALA2011050502195

Service difficulty report · Module · Boeing 777222

Difficulty date: May 4, 2011
Submitted: May 27, 2011
Operation: Air carrier
Aircraft: N785UA
Make and model: Boeing 777222
Aircraft serial: 26954
Aircraft time: 62,631 hours, 9,002 cycles
Engine: Pwa PW40903
System (JASC): 3320 · Passenger Compartment Lighting
Part: Module
Part number: 285W00271
Part serial: 52
Condition: Faulty
Location: Cabin Lights
Stage of operation: NR
How discovered: 9
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

AFT CABIN LIGHTS STUCK IN BRIGHT MODE. SUSPECT ZMU 3 FAULT. RESET ZMU3 CB H4, NO HELP. RESET CONNECTORS AT ZMU 3, NO HELP. OPEN AND COLLARED CBS AT P320 CABIN LIGHTS L07 AND G03. RPL ZMU3, NO HELP.CONFIRMED BAD ZMU 3 FROM STOCK. REPLACED ZMU 3, OPS CHECKED NORMAL.