# SDR ASAA2018121957415

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2018
- Submitted: December 20, 2018
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 47,411 hours, 14,008 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Message
- Condition: False Activation
- Location: Lt A/C Pack
- 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/ASAA2018121957415

## Discrepancy

LEFT PACK ILLUMINATED ON MASTER CAUTION RECALL EXTINGUISHES WHEN PRESSING MASTER CAUTION RESET. GROUNDED - YES. PERFORMED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST ON BOTH CONTROLLERS REF. B737-800 AMM 21-51-00-700-803. OPS. NORMAL. NO FAULTS NOTED.

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