# SDR ASAA2022121541141

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2022
- Submitted: December 16, 2022
- Operation: Air carrier
- Aircraft: [N402AS](https://openairdocs.org/aircraft/N402AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41189
- Aircraft time: 37,374 hours, 11,918 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: A/C Pack
- Condition: False Indication
- Location: Cockpit Temp
- Stage of operation: NR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022121541141

## Discrepancy

CONT CABIN ZONE TEMP LT ON RECALL AFTER ENGINE START (MAINT TAXI). GROUNDED - YES. #2 PZTC BITE SHOWS FLT DECK TRIM VALVE LT ON BIT/PREV FLT. NO FAULTS ON VERIFY TEST. RESET AFTER BIT REF B737-900 AMM 21-61-00. CABIN TEMP CONT OPS CKS GOOD. REF AMM 21-61-00 NO ZONE LT FOR CONT CABIN-ALL ZONES CK GOOD. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.

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