SDR UIEA2010071100099

Service difficulty report · Outflow Valve · Boeing 74747UF

Difficulty date: July 11, 2010
Submitted: July 13, 2010
Operation: Air carrier
Aircraft: N412MC
Make and model: Boeing 74747UF
Aircraft serial: 30559
Aircraft time: 46,036 hours, 6,856 cycles
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Outflow Valve
Condition: Malfunctioned
Location: Cabin Air
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: J, A

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

What was found

ACFT WOULD NOT MAINTAIN CABIN PRESSURE, ALT 310. FLIGHT CREW FOLLOWED QRH PROCEDURES; RETURNED TO STATION. (FUEL REMOVED PRIOR TO LANDING: 62.0. LANDING WT: 302,056) (UPON INSP, MX FOUND RT OUTFLOW VALVE AUTO MODE INOPERATIVE, MANUAL OPS NORMAL. RT OUTFLOW DEACTIVATED IN CLOSED POSITION IAW DDG AND AMM. CABIN PRESSURE CHECK NORMAL.)

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