# SDR ASAA2019022828389

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 28, 2019
- Submitted: March 5, 2019
- Operation: Air carrier
- Aircraft: [N584AS](https://openairdocs.org/aircraft/N584AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35682
- Aircraft time: 44,080 hours, 13,111 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 14813
- Condition: Failed
- Location: Ac Bay
- Part time: 26,024 hours, 8,499 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019022828389

## Discrepancy

AFTER ENGINES STARTED WITH PACKS ON RESPECTIVE ENGINES CABIN CONTROL ZONE LIGHT ILLUMINATED. CHECKLIST WOULD NOT SOLVE PROBLEM. GROUNDED - YES. PERFORMED PACK/ZONE TEMP CONTROLLER BITE REF AMM 21-61-21, FAULT LIGHT FOR PRIMARY FLT DECK TRIM AIR VALVE ILLUMINATED, REMOVED AND REPLACED PRIMARY FLT DECK TRIM AIR VALVE REF AMM 21-61-21, OPS AND LEACK CHECK GOOD.

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