What was found
AIRCRAFT WAS GROUNDED. AT CRUISE FL 370 CABIN PRESSURE FLUCTUATES -300 TO 500 FPM. CABIN ALTITUDE STABLE. REPLACED BOTH PACK TEMPERATURE/TRIM AIR VALVES, AS REQUIRED. SEE AALA202010259016 FOR LEFT HAND VALVE.
- Difficulty date
- October 23, 2020
- Submitted
- October 26, 2020
- Operation
- Air carrier
- Aircraft
- N309PC
- Make and model
- Boeing 737823
- Aircraft serial
- 31258
- Aircraft time
- 11,492 hours, 4,606 cycles
- System (JASC)
- 2130 · Cabin Pressure Control System
- Part
- Valve
- Part number
- 3989085
- Part serial
- 28465
- Condition
- Defective
- 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.