# SDR ASAA201904158970

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 12, 2019
- Submitted: April 15, 2019
- Operation: Air carrier
- Aircraft: [N472AS](https://openairdocs.org/aircraft/N472AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60580
- Aircraft time: 15,972 hours, 5,205 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: NR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA201904158970

## Discrepancy

FWD CAB ZONE TEMP LIGHT ILLUMINATES ON MASTER CAUTION RECALL. GROUNDED - YES. PERFORMED BITE TEST OF PACK TEMP CONTROL #1 & #2, NO FAULTS FOUND REF B737-900 FIM 21-60 TASK 843. PERFORMED BOTH PACKS OPS TEST NORMAL B737-900 AMM 21-00-00.

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