# SDR ASAA2022110940739

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 9, 2022
- Submitted: November 14, 2022
- Operation: Air carrier
- Aircraft: [N519AS](https://openairdocs.org/aircraft/N519AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36482
- Aircraft time: 49,870 hours, 14,656 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 11895
- Condition: Faulted
- Location: Rt Acm
- Part time: 47,674 hours, 13,988 cycles
- Stage of operation: AP
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022110940739

## Discrepancy

AFT ZONE TEMP ILLUM ON APPROACH. RESET WITH RECALL. GROUNDED - YES. REMOVED AND REPLCAED ZONE TRIM AIR MODULATING VALVE PER B737-800 AMM 21-62-21-400-801 BITE TEST GOOD.

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