# SDR ASAA2012112393364

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 23, 2012
- Submitted: November 27, 2012
- Operation: Air carrier
- Aircraft: [N597AS](https://openairdocs.org/aircraft/N597AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35689
- Aircraft time: 17,677 hours, 5,621 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 10363
- Condition: Malfunctioned
- Location: A/C Bay
- Part time: 17,452 hours, 5,551 cycles
- Stage of operation: TX
- 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/ASAA2012112393364

## Discrepancy

CONTROL CABIN ZONE TEMP ILLUM DURING RECALL AFTER START- EXTINGUISHED WITH MASTER CAUTION RESET.  ACFT GROUNDED.  R & R ZONE TRIM AIR MODULATING VALVE. REF AMM 21-61-21. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE CK.  NO FAULTS NOTED.  LK CKD GOOD.

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