# SDR MWEA97778

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N400ME](https://openairdocs.org/aircraft/N400ME), registered now
- Make and model: Doug DC-9-14
- Registry model: [Doug DC-9-14](https://openairdocs.org/model/douglas-dc-9-14) (OpenAirDocs)
- Aircraft serial: 45727
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Press Reg Valve
- Condition: Defective
- Location: Cockpit
- Stage of operation: CR
- Nature of condition: O
- Precautionary procedure: G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MWEA97778

## Discrepancy

DURING CLIMB, THE 02 MASKS DROPPED AS PRESSURE ALT ON CABIN INDICATED 8500 FT AT APPROX 26,000.  MTC PERFORMED ADJUSTMENT TEST IAW DC9MM 35-20-00 AND REINSTALLED MASK, REMOVED AND REPLACED O2 REGULATOR IAW DC9MM 35-20-1.

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