# SDR ASAA2019031628633

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2019
- Submitted: March 19, 2019
- Operation: Air carrier
- Aircraft: [N537AS](https://openairdocs.org/aircraft/N537AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35204
- Aircraft time: 28,309 hours, 8,219 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- 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/ASAA2019031628633

## Discrepancy

FLIGHT DECK ZONE TEMP LIGHT ILLUMINATES ON RECALL RESETS/EXTINGUISHES WITH MASTER CAUTION RESET. OTHER TEMP CONTROLLER OPERATES NORMALLY. GROUNDED - YES. PERFORMED FIM 21-62 TASK 842. OPERATED BOTH PACKS. DURING TEST POSITIONED SWITCH FROM COLD TO HOT MULTPILE TIMES. FAULT LIGHT DID NOT COME BACK ON. NO FAULTS FOUND. PERFORMED FIM 21-62 TASK 801 AND NO FAULTS FOUND. THIS CLEARS MEL 21-21G.

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