# SDR ASAA2023040442716

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 2023
- Submitted: April 5, 2023
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 57,521 hours, 16,989 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 632921461
- Part serial: 5507
- Condition: Failed
- Location: #2 Engine
- Part time: 12,862 hours, 4,008 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023040442716

## Discrepancy

WHILE PERFORMING TAI SOLENOID VALVE TEST FOR MW0311 HARNESS TEST ON #2 ENG , PRECOOLER CONTROL VALVE FAILED TO CLOSE IN AIR MODE TRANSITION. GROUNDED - YES. REMOVED AND REPLACED THE #2 ENG PCV PER B737-800 AMM 36-12-02.

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