# SDR ASAA2023090144907

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 1, 2023
- Submitted: September 5, 2023
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 56,849 hours, 17,096 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 11847
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 46,103 hours, 15,940 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023090144907

## Discrepancy

LEFT PACK LIGHT ILLUMINATED ON RECALL ON MASTER CAUTION RESET. RESET THE LIGHT GOES OUT. GROUNDED - YES. REMOVED & REPLACED TCV AFT LEFT PACK IAW B737-800 AMM 21-51-10/401 FAULT CLEARED. OPS CK NORMAL.

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