SDR UALA2013031501569

Service difficulty report · Sensor · Boeing 777222

Difficulty date: March 14, 2013
Submitted: April 12, 2013
Operation: Air carrier
Aircraft: N772UA
Make and model: Boeing 777222
Aircraft serial: 26930
Aircraft time: 70,475 hours, 12,613 cycles
Engine: Pwa PW4077
System (JASC): 4990 · APU Oil System
Part: Sensor
Condition: Faulty
Location: Apu Oil Temp
Stage of operation: IN
How discovered: 9
Nature of condition: J
Precautionary procedure: K

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

What was found

PRIOR TO DEPARTURE, APU AUTO SHUTDOWN TWICE. REPLACED APU OIL TEMP SENSOR PER MM, OPS CHECKED OK, APU MESSAGE CLEARED, MAT MESSAGE NOT ACTIVE. APU OIL FULL. ACFT RETURN TO BLOCKS SECOND TIME. SAME PROBLEM HIGH OIL TEMP DETECTED BY APUC. FOUND 1 X 1.5 HOLE IN LEFT SIDE BURNER SECTION. INSPECTED AREA, NO APPARENT DAMAGE TO APU COMPT. REPLACED APU, OPS CHECKED GOOD. NO LEAKS NOTED.