# SDR ASAA2020070132856

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 29, 2020
- Submitted: July 1, 2020
- Operation: Air carrier
- Aircraft: [N587AS](https://openairdocs.org/aircraft/N587AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35684
- Aircraft time: 47,668 hours, 13,858 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 2715
- Condition: Malfunctioned
- Location: Ac Bay
- Part time: 69,375 hours, 35,465 cycles
- Stage of operation: NR
- 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/ASAA2020070132856

## Discrepancy

ON RECALL CONT CAB ZONE TEMP LIGHT ILLUMINATES.  EXTINGUISHES WITH RESET.  NO TEMPERATURE FLUCTUATIONS.  GROUNDED - YES.  PERFORMED BITE CHECK, FOUND FLT DECK TRIM VALVE BAD.  REMOVED AND REPLACED FLT DECK TRIM VALVE, REF AMM 21-61-21.  OP CHECK GOOD.

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