What was found
PRESSURIZATION OUTFLOW VALVE INDICATES CLOSED ON GROUND. GROUNDED - YES. CYCLED ELEC PWR - PERFORMED BITE TEST OF BOTH CABIN PRESS CONTROLLERS & MANUAL OPS CK OF OUTFLOW VALVE NML PER B737-900 AMM 21-31-00.
- Difficulty date
- December 19, 2018
- Submitted
- December 20, 2018
- Operation
- Air carrier
- Aircraft
- N423AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 35206
- Aircraft time
- 22,339 hours, 7,364 cycles
- System (JASC)
- 2133 · Pressure Regulator/Outflow Valve
- Part
- Outflow Valve
- Condition
- Malfunctioned
- Location
- Cabin Pressure
- Stage of operation
- TX
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.