# SDR ASAA2021030334220

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 1, 2021
- Submitted: March 4, 2021
- Operation: Air carrier
- Aircraft: [N433AS](https://openairdocs.org/aircraft/N433AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41704
- Aircraft time: 27,879 hours, 8,905 cycles
- Engine: Cfmint CFM567B27E
- 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/ASAA2021030334220

## Discrepancy

CONT CABIN ZONE TEMP INOP (LIGHT ILLUMINATES ON RECALL. RESETS OFF WITH MC RESET). GROUNDED - YES. PERFORMED TEMP CONT BITE TEST REF B737-900 AMM 21-61-00-700-806-002 CONTLR 2 REPORTED FAULT ON TRIM VALVE ON PREV FLIGHT. PERFORMED VERIFY OP'S CHECK, FAULT CLEARED. VERIFIED 2ND BITE, NO FAULTS NOTED.

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