# SDR MYWA110131

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 17, 2011
- Submitted: December 20, 2011
- Operation: Air carrier
- Aircraft: [N742MA](https://openairdocs.org/aircraft/N742MA), registered now
- Make and model: Boeing 737-8Q8
- Registry model: [Boeing 737-8Q8](https://openairdocs.org/model/boeing-737-8q8) (OpenAirDocs)
- Aircraft serial: 30675
- Aircraft time: 27,625 hours, 11,330 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Precooler
- Condition: Defective
- Location: Bleed Air Sys
- 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/MYWA110131

## Discrepancy

ETOPS SIGNIFICANT SYSTEM:  LEFT ENG BLEED TRIPPED JUST BEFORE TOP OF CRUISE.  ACCOMPLISHED HEALTH CHECK ON NR 1 ENGINE IAW B737-800 M/M 36-11-00 FOUND PRECOOLER VALVE AT FAULT REMOVED AND REPLACED NR 1 ENGINE PRECOOLER VALVE IAW B737-800 M/M 36-12-02, OPS CHECK NORMAL.

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