What was found
OUTFLOW VALVE INDICATE 90% OPEN CRUISING AT FL 330. CABIN ALTITUDE 6200 FT DIFFERENTIAL PRESSURE +7.8. ACFT GROUNDED. CYCLED THE SWITCH POWER, NORMAL INDICATION RESTORED.
- Difficulty date
- February 24, 2018
- Submitted
- February 26, 2018
- Operation
- Air carrier
- Aircraft
- N481AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44106
- Aircraft time
- 10,184 hours, 3,432 cycles
- System (JASC)
- 2133 · Pressure Regulator/Outflow Valve
- Part
- Outflow Valve
- Condition
- Malfunctioned
- Location
- Cabin Pressure
- Stage of operation
- CR
- 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.