# SDR MYWA07202012738

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2012
- Submitted: July 24, 2012
- Operation: Air carrier
- Aircraft: [N738MA](https://openairdocs.org/aircraft/N738MA), registered now
- Make and model: Boeing 737-8Q8
- Registry model: [Boeing 737-8Q8](https://openairdocs.org/model/boeing-737-8q8) (OpenAirDocs)
- Aircraft serial: 32799
- Aircraft time: 18,957 hours, 7,362 cycles
- System (JASC): [3620 · Pneumatic Indicating System](https://openairdocs.org/jasc/3620)
- Part: Valve
- Part number: 32895625
- Condition: Inoperative
- Location: Precooler
- 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/MYWA07202012738

## Discrepancy

20 PSI DUCT PRESSURE SPLIT AT FL350 IN CRUISE.  LEFT INDICATING 17 PSI.  RT INDICATING 37 PSI.   TROUBLESHOT IAW FIM 36-10 TASK 807/906 AMM 36-11-00-700-801.  FOUND PRE-COOLER VALVE INOPERATIVE.  REMOVED AND REPLACED PRE COOLER CONTROL VALVE IAW AMM 36-17-02.  OPS CHECKED NORMAL.

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