# SDR AALA202201262034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 25, 2022
- Submitted: January 26, 2022
- Operation: Air carrier
- Aircraft: [N902NN](https://openairdocs.org/aircraft/N902NN), registered now
- Make and model: Boeing 737*
- Aircraft serial: 31154
- Aircraft time: 27,395 hours, 1,851 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Condition: Inoperative
- Location: Zone 100 - Fuse
- Stage of operation: CL
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202201262034

## Discrepancy

AIRCRAFT WAS GROUNDED: LH PACK LIGHT ILLUMINATED CLIMBING THROUGH 18,000 FT, TRIP RESET EXTINGUISHED LIGHT BUT RE-ILLUMINATED AFTER 30 SECONDS -- REPEAT ITEM; FLIGHT RETURNED TO FIELD. REPLACED LH PACK TEMPERATURE CONTROL VALVE IAW AMM 21-51-10, OPS CHECK GOOD.

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