# SDR ASAA2017120322767

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 3, 2017
- Submitted: December 5, 2017
- Operation: Air carrier
- Aircraft: [N434AS](https://openairdocs.org/aircraft/N434AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 61620
- Aircraft time: 6,961 hours, 2,252 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Light
- Condition: Illuminated
- Location: Cabin Temp
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017120322767

## Discrepancy

ON RECALL - ZONE TEMP LIGHT FOR CONT CAB ILLUMINATES AND CLEARS WHEN MASTER CAUTION IN RESET. GROUNDED - YES. RELEASED PER MEL 21-21F CONT CAB ZONE TEMP PRIMARY/BACKUP INOP. INTERROGATED THE PFTC. FOUND NO FAULTS. ACCOMPLISHED PFTC BITE CHECK REFB737-900 FIM TASK 21-62 TASK 801. NO FAULTS LOGGED. NO HISTORY PAST 30 DAYS. MEL 21-21F CLEARED.

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