# SDR 9713126637

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 1, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N637US
- Make and model: Boeing 747251B
- Aircraft serial: 23549
- Engine: Pwa JT9D7R4G2
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Compressor
- Condition: Stalled
- Location: Nr 4 Engine
- Stage of operation: TX
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9713126637

## Discrepancy

AFTER STARTING AND WITH ENGINE STABLE AT IDLE, THE NR 4 ENGINE COMPRESSOR STALLED.  N1, N2, AND OIL PRESSURE DROPPED WITH EGT RISING TO 490 CELSIUS.  SECOND START WAS NORMAL.  MAINTENANCE RAN ENGINE WITH NO DEFECTS NOTED.  EXACT PART CAUSING PROBLEM TO BE DETERMINED.

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