# SDR ASAA2021111636625

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 16, 2021
- Submitted: November 18, 2021
- Operation: Air carrier
- Aircraft: [N588AS](https://openairdocs.org/aircraft/N588AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35685
- Aircraft time: 49,600 hours, 14,760 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Switch
- Part number: 6411721
- Condition: Inoperative
- Location: Fwd Cargo Compar
- Stage of operation: CL
- 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/ASAA2021111636625

## Discrepancy

LEFT PACK LIGHT ILLUMINATED ON CLIMB OUT THROUGH 18500. UNABLE TO RESET THE SECOND TIME. GROUNDED - YES. PERFORMED BITE CHECK OF L/H PACK ZONE TEMP CONTROLLER AND PERFORMED OPS CHK OF L/H PACK W/ NO FAULTS NOTED. REPLACED DISCHARGE O/H SWITCH PER B737-800 AMM 21-51-42, TURBINE INLET O/H SWITCH PER AMM 21-51-41, AND COMP DISCHARGE O/H SWITCH PER AMM 21-51-40, ALL OPS CHK NORMAL. ETOPS GND VERIFICATION SUCCESSFUL. A/C OK FOR SVC. SEAMC JEREMY NOTIFIED. NON ASA# TSAH74M.

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