# SDR ASAA2019080213272

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 31, 2019
- Submitted: August 3, 2019
- Operation: Air carrier
- Aircraft: [N506AS](https://openairdocs.org/aircraft/N506AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35690
- Aircraft time: 42,017 hours, 12,855 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 32149721
- Part serial: 2282
- Condition: Failed
- Location: Right Ecs Bay
- Part time: 42,017 hours, 12,855 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019080213272

## Discrepancy

TEMP CONTROLLERS ARE NOT VERY RESPONSIVE. AFT CONTROLLER FOR EXAMPLE COULD NOT COMMAND MORE THAN 18'C DUCT SUPPLY EVEN AT THE 3 O'CLOCK POSITION. GROUNDED - YES. REMOVED AND REPLACED TRIM AIR PRESSURE AND SHUTOFF VALVE REF B737-800 AMM 21-62-01/401. OPS CHECK GOOD, GROUND VERIFICATION SUCCESSFUL. FOUND OLD VALVE IN MANUAL MODE, SUSPECT TO BE AT FAULT.

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