# SDR ASAA2017102722342

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 27, 2017
- Submitted: October 30, 2017
- Operation: Air carrier
- Aircraft: [N536AS](https://openairdocs.org/aircraft/N536AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35203
- Aircraft time: 22,307 hours, 6,443 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989083
- Part serial: 9753
- Condition: Faulted
- Location: Lt Cabin Temp
- Part time: 38,317 hours, 11,281 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/ASAA2017102722342

## Discrepancy

AIR CONDITIONING AND ZONE TEMP LIGHT ILLUMINATED.  MASTER CAUTION PRESSED LIGHTS GO OUT.  CONTROL CABIN ZONE LIGHT DOES RESET WITH MASTER CAUTION RESET.  ACFT GROUNDED.  REMOVED AND REPLACED A FAULTED CONTROL CABIN ZONE TRIM AIR MODULATING VALVE IAW AMM 21-61-21. FAULT CLEARED ON THE PACK/ ZONE TEMP CONTROLLERS, OPS AND LEAK CHECKED GOOD.

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