# SDR ASAA2018111966880

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 16, 2018
- Submitted: November 19, 2018
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 13,435 hours, 4,517 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Light
- 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/ASAA2018111966880

## Discrepancy

LH PACK LIGHT ON RECALL - EXTINGUISHES ON RESET. GROUNDED - YES. PER B737-900 FIM 21-32 TASK 801 AND 834 INITIAL EVALUATION #2 PACK/ZONE TEMP CONTROL HAS ZONE TRIM VALVE FAULT. VERIFY FUNCTION PASS. GREEN. #1 PACK/ZONE TEMP CONTROL BITE SHOWS NO FAULTS. VERIFY FUNCTION PASS. GREEN. NO ACTIVE FAULTS. NO FURTHER ACTION NECESSARY PER FIM.

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