# SDR ASAA2014121509958

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2014
- Submitted: December 17, 2014
- Operation: Air carrier
- Aircraft: [N433AS](https://openairdocs.org/aircraft/N433AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41704
- Aircraft time: 4,465 hours, 1,421 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989084
- Part serial: 20282
- Condition: Failed
- Location: A/C Bay
- Part time: 4,474 hours, 1,421 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/ASAA2014121509958

## Discrepancy

AFT CABIN ZONE TEMP LIGHT CAME ON WITH RECALL.  ACFT GROUNDED.  R & R AFT CABIN ZONE TEMP TRIM AIR MODULATING VALVE.  RAN RT PACK LEAK CHECKED GOOD.  ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST NO FAULTS FOUND.  ALL WORK DONE IAW AMM 21-61-00-700-806-002 AND 21-61-21-000-801.

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