# SDR ASAA2017110622470

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 6, 2017
- Submitted: November 8, 2017
- Operation: Air carrier
- Aircraft: [N593AS](https://openairdocs.org/aircraft/N593AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35107
- Aircraft time: 36,564 hours, 11,190 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 20359
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 12,865 hours, 5,018 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017110622470

## Discrepancy

ZONE TEMP LIGHT ILLUMINATED JUST AFTER LEVEL OFF AT FL350. LIGHT EXTINGUISHED WHEN MASTER CAUTION BUTTON PUSHED. ACCOMPLISHED QRH PROCEDURES. (CONT CAB ZONE LIGHT).  ACFT GROUNDED. PERFORMED FIM 21-62 ,TASK 848, REMOVED AND REPLACED CONTROL CABIN TRIM VALVE IAW AMM 21-61-21/401. NR 1 & 2 PZTC BITE TESTED NORMAL, BOTH PACK OPS CHECKED NORMAL ON GROUND. VALVE LEAK CHECKED GOOD.

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