# SDR ASAA2021012733984

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 27, 2021
- Submitted: February 3, 2021
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 51,320 hours, 15,326 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Switch
- Condition: Malfunctioned
- Location: Cockpit Temp
- 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/ASAA2021012733984

## Discrepancy

UPON MASTER CAUTION RECALL ZONE TEMP LIGHT ILLUMINATED ABOVE CONT CAB SWITCH. GROUNDED - YES. RELEASED PER MEL 21-21G FLT DECK PRIMARY TEMP CONT INOP. ACCOMPLISHED B737-800 FIM 21-62 TASK 845 STEP E. (1) (A) (1), NO CONT CAB "ZONE TEMP" LIGHT. ACCOMPLISHED FIM 21-62 TASK 801, NO FAULTS FROM BITE. GROUND VERIFICATION SUCCESSFUL.

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