SDR CALA2013102992464

Service difficulty report · Contactor · Boeing 757222

Difficulty date: October 26, 2013
Submitted: November 1, 2013
Operation: Air carrier
Aircraft: N502UA
Make and model: Boeing 757222
Aircraft serial: 24623
Aircraft time: 81,391 hours, 24,726 cycles
Engine: Pwa PW2037
System (JASC): 4940 · APU Start/Ignition System
Part: Contactor
Condition: Faulty
Location: Apu
Stage of operation: IN
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

APU WILL NOT START, APU INOPERATIVE. REPLACED CONT BREAKER, REPLACED APU BATTERY, REPLACED APU CONTROLLER 2117342-20, SERIAL OFF = 15, REPLACED APU DOOR ACTUATOR & NO HELP. IAW DF198 FOR APU DOOR MESSAGE. REPLACED APU BATTERY CHARGER 8-930-03, SERIAL OFF = 313, APU DOOR RELAY, APU START RELAY, NO HELP. ON ELECT PAGE BATTERY READS ZERO. REPLACED RELAY 563-0208 CONTACTOR. TROUBLE SHOT WIRING DIAGRAM, NORMAL OPERATIONS NOTED. RESTARTED APU NO FAULTS WERE NOTED. REPLACED CONTACTOR 563-0208 IAW MM 49-41-05