SDR UIEA200800281

Service difficulty report · Relief Valve · Boeing 7472D7B

Difficulty date: August 3, 2008
Submitted: August 7, 2008
Operation: Air carrier
Aircraft: N528MC
Make and model: Boeing 7472D7B
Aircraft serial: 22472
System (JASC): 3610 · Pneumatic Distribution System
Part: Relief Valve
Part number: 227565112
Condition: Leaking
Location: Nr 4 Engine
Stage of operation: CR
How discovered: O
Nature of condition: M, J
Precautionary procedure: E, A

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

What was found

AT CRUISE NR 4 ENG HAD MULTPLE FIRE WARNINGS ON BOTH A&B. PERFORMED IN FLIGHT SHUT DOWN AND AIR TURNBACK. MAINTENANCE FOUND LEAKING PRESSURE RELIEF VALVE, WHICH WAS BLASTING HOT AIR ON THE DETECTORS. REPLACED OVER PRESSURE RELIEF VALVE PER 36-11-03, OPS CHECKED OK. (S)

More about the Boeing 747-2D7B