# SDR ASAA2022030537658

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 5, 2022
- Submitted: March 12, 2022
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 54,642 hours, 16,064 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 32865
- Condition: Inoperative
- Location: Left Ecs Bay
- Part time: 11,333 hours, 3,343 cycles
- Stage of operation: TX
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022030537658

## Discrepancy

AFTER PUSH BACK AND COMPLETION OF "AFTER START" CHECKLIST ON - RECALL MASTER & CONT CAB ZONE TEMP LIGHT ILLUMINATED CAUTION. GROUNDED - YES. PERFORMED TROUBLESHOOTING PER B737-800 FIM TASK 21-62-00-810-831 FOUND RIGHT TEMP CONTROL VALVE BAD.  REMOVED AND REPLACED RIGHT TEMP CONTROL VALVE IAW B737-800 AMM 21-51-10.   PERFORMED OPS CHECK,  OPS CHECK GOOD AT THIS TIME.

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