# SDR ASAA2014080308748

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 3, 2014
- Submitted: August 5, 2014
- Operation: Air carrier
- Aircraft: [N585AS](https://openairdocs.org/aircraft/N585AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35683
- Aircraft time: 26,448 hours, 7,984 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Control Valve
- Condition: Failed
- Location: Nr 2 Precooler
- Part time: 51,867 hours, 25,964 cycles
- 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/ASAA2014080308748

## Discrepancy

PRESSURE DUCT SPLIT - DUCT PRESSURE 43 LT WITH 16 RT INFLIGHT 350 FL AT -47 DEGREE C AT CRUISE DUCT PRESSURE MATCH UP AT 30 PSI IN DESCENT.  ACFT GROUNDED.  REPLACED PRECOOLER CONTROL VALVE IAW AMM 36-12-02.  REPLACED 450 DEGREE THERMO IAW AMM 36-11-05.  GROUND VERIFICATION GOOD.

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