SDR UPS04441702

Service difficulty report · Check Valve · Boeing 747200

Difficulty date: January 9, 2004
Submitted: January 9, 2004
Operation: Air carrier
Aircraft: N520UP
Make and model: Boeing 747200
Aircraft serial: 1
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Check Valve
Condition: Stuck
Location: Cabin Pressure
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

DECOMP LIGHT AND ALT WARNING HORN 10000 ALT CAME ON AT ALT 22000. ACCOMPLISHED RAPID DECOMP AND EMERGENCY DESCENT. CHECK LIST BUMP PUEL ATB FOUND PNEU GROUND CONNECT CHECK VALVE INTERMITTENT, STUCK OPEN POS. REMOVED AND REPLACED PNEU GND CONNECT CHECK LEFT VALVE AND CHECKED O.K. IAW MM 36-11-14ALL DOOR SEALS AND PERFORMED EXCESSIVE CABIN PRESSURE LEAKAGE CONDITION INSP COMPLETE IAW AMM 05-51-08 P201. AND PRESS CONT SYS TEST O.K IAW AMM 21-31-00P 501

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