# SDR ASAA2021102036374

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 20, 2021
- Submitted: October 26, 2021
- Operation: Air carrier
- Aircraft: [N486AS](https://openairdocs.org/aircraft/N486AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44107
- Aircraft time: 22,569 hours, 7,199 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021102036374

## Discrepancy

FWD ZONE TEMP ILLUM ON MASTER CAUTION RECALL. GROUNDED - YES. PERFORMED B737-900 FIM 21-62 TASK 801, TRIM VALVE AT FAULT. PERFORMED FIM 21-62 TASK 833 BITE INITIAL EVAL GOOD AFTER BITE PERFORMED. NO HISTORY LAST 30 DAYS. OPS NML REF. MM 21-61-00. THIS CLEARS MEL 21-19G PLC C/N 20035486. SEAMC MIKE NOT.

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