# SDR AALA202010259016

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 2020
- Submitted: October 26, 2020
- Operation: Air carrier
- Aircraft: [N309PC](https://openairdocs.org/aircraft/N309PC), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31258
- Aircraft time: 11,492 hours, 4,606 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Valve
- Part number: 3989085
- Part serial: 28463
- Condition: Defective
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202010259016

## Discrepancy

AIRCRAFT WAS GROUNDED.  AT CRUISE FL 370 CABIN PRESSURE FLUCTUATES -300 TO 500 FPM.  CABIN ALTITUDE STABLE.  REPLACED LEFT HAND AND RIGHT HAND PACK TEMPERATURE/TRIM AIR VALVES, AS REQUIRED.  SEE AALA202010269018 FOR RIGHT HAND VALVE.

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