# SDR ASAA2013022593992

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 25, 2013
- Submitted: February 27, 2013
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 20,693 hours, 6,513 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Control Valve
- Part number: 32895625
- Part serial: 11724
- Condition: Failed
- Location: Nr 2 Precooler
- Part time: 15,296 hours, 4,795 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/ASAA2013022593992

## Discrepancy

DURING CRUISE PNEUMATIC DUCT PRESSURE NEEDLE SPLIT WAS INTERMITTENTLY 25PSI ( LT 45 PSI & RT 20 PSI ).  AT OTHER TIMES IT WAS AS LITTLE AS 10 PSI DIFFERENTIAL.  ACCOMPLISHED NR 2 ENGINE BLEED AIR SYS HEALTH CHECK IAW T/C NG-36WC-00001. PRECOOLER CONTROL VALVE FAILED HEALTH CHECK.  R & R THE PCV IAW AMM 36-12-02-400-801. OPS CHECK GOOD.  ACCOMPLISHED BLEED AIR OPS TEST & REPAIR CONFIRMATION REF MM 36-11-00-710-801 & FIM 36-10-00-810-807.  DUCT PRESSURE DETERMINED TO BE WITHIN CHART LIMITS AT REFERENCED POWER SETTINGS.

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