SDR UALA2012082204698

Service difficulty report · O-Ring · Boeing 747422

Difficulty date: August 22, 2012
Submitted: October 11, 2012
Operation: Air carrier
Aircraft: N120UA
Make and model: Boeing 747422
Aircraft serial: 29166
Aircraft time: 55,072 hours, 6,436 cycles
Engine: Pwa PW4056
System (JASC): 4930 · APU Engine Fuel and Control
Part: O-Ring
Condition: Leaking
Location: Fuel Shroud
Stage of operation: IN
How discovered: V
Nature of condition: K
Precautionary procedure: K

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

What was found

FUEL LEAKING AT APU HST FUEL SHROUD APPROX 25 DROPS PER SECOND. NEED TO REPLACE APU FUEL LINE. REMOVED APU FUEL LINE FROM STN 1648 THRU STN 2030 PER MM. REMOVED APU FUEL LINE FROM BODY STA 1265.0 TO 1648.0 PER MM. REPLACED O-RINGS ON FUEL SHROUD DETAIL B AND D AT APPROX STA 1265.0. SMALL FUEL LINE 60B92407-39 IS IN PLACE AND NEEDS TO BE TORQUED. PARTS IN AREA. REPLACED APU FUEL LINE AND COMPLETED LEAK CHECKS ON PTT'S.