SDR 2007UALA02444

Service difficulty report · Apu · Boeing 767322

Difficulty date: July 6, 2007
Submitted: July 10, 2007
Operation: Air carrier
Aircraft: N674UA
Make and model: Boeing 767322
Aircraft serial: 29242
Aircraft time: 25,553 hours, 6,889 cycles
Engine: Pwa PW4052
System (JASC): 4920 · APU Core Engine
Part: Apu
Condition: Shutdown
Stage of operation: IN
How discovered: O
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

APU AUTO SHUTDOWN 3 TIME AT GATE. [07-27-07] REPLACED APU BATTERY PRECAUTIONARY DUE TO BAT VOLTS NOTED AT 16VDC DURING CRANKING. INSTALLED A NEW ENGINE CONTROL UNIT DUE TO ORIG BOX DOES NOT RECORD OR CAPTURE FAULTS OF AUTOSHUTDOWN. ALSO, REPLACED OIL COOLER AND BY-PASS VALVE PER MM. FOUND GEARBOX SHUTOFF VALVE PNEU LINE LOOSE. APU OPS CHKS GOOD DURING CREW VERIFICATION FLT. APU STARTED AND OPS CHKS NORMAL AT FLT LEVEL 370 ON TWO DIFFERENT FLIGHTS. AIRCRAFT OK FOR SERVICE AND RETURNED TO ETOPS.