SDR P5CA0701535

Service difficulty report · Isolation Valve · Boeing 74747UF

Difficulty date: September 30, 2007
Submitted: October 5, 2007
Operation: Air carrier
Aircraft: N416MC
Make and model: Boeing 74747UF
Aircraft serial: 32838
Aircraft time: 25,825 hours, 4,057 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Isolation Valve
Part number: 398321051
Part serial: 4974
Condition: Malfunctioned
Location: Apu
Stage of operation: CR
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 EICAS MESSAGE AFTER T/O. ALSO HEARD LOUD SOUND FROM ABOVE MAIN DECK SIDE CARGO DOOR. AIR TURNBACK. REPLACED APU ISOLATION VALVE, INSEPCTED DUCTS NO DEFECTS NOTED. ACCOMPLISHED PRESSURIZATION CHECK OF CARGO DOOR AND INSPECTED SEALS. NO DEFECTS NOTED, PER MM 36-11-09.

More about the Boeing 747-47UF