# SDR ASAA2021060635049

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2021
- Submitted: June 9, 2021
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44106
- Aircraft time: 21,711 hours, 6,941 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Condition: Malfunctioned
- Location: Cockpit Temp
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021060635049

## Discrepancy

CONT CAB ZONE TEMP INDICATION FLT DECK PRIMARY TEMP CONTROL INOP. GROUNDED - YES. VERIFIED FAULT, REMOVED & CLEANED & REINSTALLED. ALL 3 TEMP SENSOR FILTERS. ACCOMP PACK/ ZONE CONTLR BITE. #1 NO FAULTS #2 FAULTS FLT DECK TRIM VALVE. ACCOMP RESET. RE-ACCOMP BITE TEST, TEST PASS NO FAULTS. REF B737-900 AMM 21-61-06-400-801 & AMM 21-61-00-700-806-002.

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