What was found
AIR TURNBACK/DECLARED EMERGENCY. PASSING FL 220 CABIN ALTITUDE HORN CAME ON UPON DESCENT. UNABLE TO CONTROL OUTFLOW VALVE IN AUTO/ALTERNATE BUT CONTROLLABLE IN MANUAL. REMOVED AND REPLACED OUTFLOW VALVE PER MM.
- Difficulty date
- April 15, 2011
- Submitted
- April 20, 2011
- Operation
- Air carrier
- Aircraft
- N623SW
- Make and model
- Boeing 7373H4
- Aircraft serial
- 27933
- Aircraft time
- 50,003 hours, 40,577 cycles
- System (JASC)
- 2133 · Pressure Regulator/Outflow Valve
- Part
- Outflow Valve
- Part number
- 327375
- Part serial
- 0777
- Condition
- Faulty
- Location
- Cabin Pressure
- Stage of operation
- DE
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.