# SDR ASAA2019103191184

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2019
- Submitted: October 31, 2019
- Operation: Air carrier
- Aircraft: [N592AS](https://openairdocs.org/aircraft/N592AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35190
- Aircraft time: 44,940 hours, 13,523 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Message
- Condition: False Activation
- Location: Cockpit Temp
- Stage of operation: TX
- 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/ASAA2019103191184

## Discrepancy

DURING AFTER START CHECKLIST RECALL MASTER CAUTION SHOWED AIR COND & CONT CABIN ZONE TEMP FOLLOWED QRH & MEL PROCEDURE LITE EXTINGUISHES WITH MASTER CAUTION RESET.  GROUNDED - YES. PERFORMED BITE OF BOTH ZONE TEMP CONTROLLERS REF B737-800 FIM 21-62 TASK 801. NO FAULTS FOUND ON EITHER ZONE TEMP CONTROLLER. MEL 21-21G CLEARED.

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