# SDR ASAA2019112201411

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 20, 2019
- Submitted: November 23, 2019
- Operation: Air carrier
- Aircraft: [N532AS](https://openairdocs.org/aircraft/N532AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36346
- Aircraft time: 36,115 hours, 10,762 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Message
- Condition: False Activation
- Location: Zone Temp
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019112201411

## Discrepancy

AFTER PUSHBACK AND ENGINE START: MASTER CAUTION GAVE AIR COND WITH ZONE TEMP. THIS RESET WITH MASTER CAUTION PUSH TO RESET. THE ZONE TEMP WAS CONT CAB. GROUNDED - YES. RELEASED PER MEL 21-21G FLIGHT DECK PRIMARY TEMP CONTROL INOP. ACCOMPLISHED ZONE TEMP CONTROL BITE B737-800 AMM 21-61-00 GRD VERIFICATION SUCCESSFUL THIS CLEARS MEL 21-21G.

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