SDR UALA2013061704161

Service difficulty report · Outflow Valve · Boeing 767322

Difficulty date: June 14, 2013
Submitted: July 12, 2013
Operation: Air carrier
Aircraft: N652UA
Make and model: Boeing 767322
Aircraft serial: 25390
Aircraft time: 90,385 hours, 14,336 cycles
Engine: Pwa PW4060
System (JASC): 2133 · Pressure Regulator/Outflow Valve
Part: Outflow Valve
Part number: 60683221U1
Part serial: 3
Condition: Malfunctioned
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

RECEIVED A CABIN ALTITUDE WARNING IN AUTO 1 - CABIN ALTITUDE REACHED 10,000 FT, MANUAL CONTROL AND AUTO 1 OK, NOW CONTROL OK AND AUTO 1 OK. NOW SHOWING GRADUAL CLIMB IN AUTO 1 EVEN THOUGH DIFFERENTIAL PRESSURE IS LESS THAN 8 PSI. CREW SELECTED MANUAL AND RECOVERED CABIN PSI. ACCOMPLISHED LM CALLOUTS ON PTT SEQ 3852009, 3852008 AND 3852001, OPS CHECKED GOOD.