# SDR DL73E992585

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 23, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N377DL](https://openairdocs.org/aircraft/N377DL), registered now
- Make and model: Boeing 737247
- Aircraft serial: 23604
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Regulator Valve
- Condition: Failed
- Location: Nr 2 Engine
- Component: 363001144
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: I
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL73E992585

## Discrepancy

WHILE PASSING THROUGH FL230 CABIN ALT WAS NOTED TO BE APPROX 10,000 FT AND CLIMBING 1,000 FT/SEC.  A/C LEVELED AT FL230 WITH CABIN CLIMBING.  DESCENDED A/C AND SWD TO MAN DC CONTROL.  OUTFLOW VLV INDICATED FULL CLOSED.  MAN CONTROL CLOSED ONE MORE NEEDLE WIDTH TO FULL CLOSED AND CABIN CONTROL WAS REGAINED.  WHILE T/S FOUND CK VLV AND HP REG VLV BAD, NR 2 ENG.  BOTH ITEMS REPLACED AND PERFORMED CK OUT PER MM 21-11-0 PG 504.  ALL OPS AND INDICATIONS NORMAL.

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