# SDR ASAA2020012171897

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 2020
- Submitted: January 22, 2020
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 18,253 hours, 5,835 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Light
- Condition: False Activation
- 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/ASAA2020012171897

## Discrepancy

CONT CAB ZONE TEMP LIGHT ILLUMINATED ON RECALL AND WAS RESETTABLE. GROUNDED - YES. INITIAL EVALUATION, HAD ZONE TEMP LIGHT ILLUMINATED ON RECALL. PERFORMED PACK TEMP CONTROL BITE PROCEDURE FOLLOWING B737-900 FIM 21-62 TASK 842. PREVIOUS FLT HAD FLT DECK TRIM VALVE LIGHT ILLUMINATED, WHICH CLEARED ON VERIFY. RE-RAN BITE CHECK AFTER OPERATING BOTH PACKS 5-10 MINS EA. NO FAULTS FOUND.

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