SDR SWAA961198

Service difficulty report · Outflow Valve · Boeing 7373H4

Difficulty date: October 30, 1996
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N350SW
Make and model: Boeing 7373H4
Aircraft serial: 24409
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Outflow Valve
Part number: 322684003
Condition: Inoperative
Location: Cabin
Stage of operation: CR
Nature of condition: O
Precautionary procedure: B

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

What was found

AT 37,000, CABIN ALTITUDE ALERT WARNING SOUNDED. SWITCHING TO MAN OR STANDBY MODES, NO HELP. DESCENDED TO LEVEL WHERE PRESSURE WAS REGAINED. LANDED WITHOUT INCIDENT. FWD OUTFLOW VALVE FAILED TEST. REPLACED VALVE AND SYSTEM CHECKED OK PER BOEING M/M.

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