# SDR MJYA20260403002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 3, 2026
- Submitted: April 5, 2026
- Operation: Air carrier
- Aircraft: [N782TW](https://openairdocs.org/aircraft/N782TW), registered now
- Make and model: Doug DC-9-15F
- Registry model: [Doug DC-9-15F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-15f) (OpenAirDocs)
- Aircraft serial: 45826
- Aircraft time: 53,674 hours, 60,043 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Valve
- Part number: 39605011
- Part serial: P342
- Condition: Stuck
- Location: Zone 100
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MJYA20260403002

## Discrepancy

UNABLE TO MAINTAIN CABIN PRESSURE WITH ONE PACK.  CABIN LIGHT ILLUMINATED SHORTLY AFTER REACHING FL250.  LAFT PACK INOP.  RT PACK CURRENTLY ON MEL REF DMI# 7827716C.    REMOVED AND REPLACED RT & LT FLOW CONTROL VALVES, LH SHUTOFF DIFFERENTIAL PRESSURE SWITCH PER AMM 21-31-2 AND 21-31-9.  REMOVED AND REPLACED CABIN PRESSURE CONTROLLER IAW AMM 21-31-2.

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