What was found
FLIGHT ATTENDANTS REPORT LOUD SQUEALING SOUND ENROUTE AT ALTITUDE. PRESSURIZATION NORMAL. SQUEAL DIMINISHED @ 4 PSI DIFFERENTIAL. GROUNDED - YES. REMOVED AND REPLACED OUTFLOW VALVE WITH NEWER STYLE REF B737-900 AMM 21-31-03.
- Difficulty date
- November 4, 2022
- Submitted
- November 7, 2022
- Operation
- Air carrier
- Aircraft
- N493AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41727
- Aircraft time
- 23,873 hours, 7,504 cycles
- System (JASC)
- 2133 · Pressure Regulator/Outflow Valve
- Part
- Outflow Valve
- Part number
- 2123010BA
- Part serial
- 14115186
- Condition
- Leaking
- Location
- Cabin Pressure
- Part time
- 10 hours, 2 cycles
- Stage of operation
- NR
- 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.