# SDR DL73S040549

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 13, 2004
- Submitted: June 14, 2004
- Operation: Air carrier
- Aircraft: N375DL
- Make and model: Boeing 737247
- Aircraft serial: 23602
- Aircraft time: 45,929 hours, 35,323 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 7110035
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL73S040549

## Discrepancy

PASSING FL 220 CABIN UNABLE TO MAINTAIN PRESSURIZATION.  DESCENT INITIATED QRH PROCEDURES ACCOMPLISHED.  NO INJURIES OR AIRCRAFT DAMAGE.  REPLACED AIRCRAFT OUTFLOW VALVE ASSEMBLY PER M/M.  SYSTEM CHECKS NORMAL.

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