# SDR IPXA2023081193874

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 10, 2023
- Submitted: August 11, 2023
- Operation: Air carrier
- Aircraft: [N291UP](https://openairdocs.org/aircraft/N291UP), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48477
- Aircraft time: 79,899 hours, 14,625 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Valve
- Part number: UNKNOWN
- Part serial: NA
- Condition: Obstructed
- 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/IPXA2023081193874

## Discrepancy

INSPECTION TYPE:NA*DIVERSION* AT FL 380 LEVEL ONE ALERT CABIN PRESS RELIEF CABIN ALT BEGAN CLIMBING WITH OUTFLOW VALVE CLOSED BEGAN DECENT DURING DECENT MASTER WARNING CABIN ALT LEVEL 3ACCOMPLISHED FIM 21-33-02-00 BLOCKS 1, 2, 5 & 8 FOUND INSULATION MATERIAL IN MIDDLE CABIN POSITIVE PRESSURE RELIEF VALVE REMOVED & REPLACED MIDDLE VALVE WITH REF TO MM 21-34-01-401 REF LOGPAGE 638040 ITEMS 2 AND 3 FOR FUNCTIONAL CHECKS ESR IPC 21-34-01-01

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