SDR UALA2010091003355

Service difficulty report · Charger · Boeing 777222

Difficulty date: September 10, 2010
Submitted: September 15, 2010
Operation: Air carrier
Aircraft: N797UA
Make and model: Boeing 777222
Aircraft serial: 26924
Aircraft time: 56,007 hours, 8,056 cycles
Engine: Pwa PW40903
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Charger
Part number: 263BC1013
Part serial: 143
Condition: Faulty
Location: Apu
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

APU WILL NOT START. REPLACED APU BATTERY, NO HELP. APU WILL NOT START ELECTRICALLY OR PNEUMATICALLY, APU FAULT LIGHT STAYS ON WITH APU STATUS MESSAGE. APU BATT DROPPED TO 7VOLTS WITH 173 AMP DISCHARGE, NO RPM INDICATED WITH EITHER ELEC OR PNEU START. REPLACED APU BATTERY CHARGER. REPLACED APU, ALL OKAY.