# SDR ASAA2023010941438

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 4, 2023
- Submitted: January 9, 2023
- Operation: Air carrier
- Aircraft: [N593AS](https://openairdocs.org/aircraft/N593AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35107
- Aircraft time: 53,997 hours, 16,097 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Light
- Condition: False Activation
- Location: Cockpit Temp
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023010941438

## Discrepancy

ON RECALL, CONT CAB ZONE TEMP LIGHT CAME ON. GROUNDED - YES. OPERATED R & L PACK SYSTEMS = CONT CAB ZONE TEMP LIGHT NOT ON AND NOT ILLUMINATED ON RECALL. BITE TEST OF #2 PZTC FAULTED FLT DECK TRIM VALVE ON PREVIOUS FLIGHTS & PZTC #1 FAULTED TCV THIS PACK, BOTH FAULTS CLEARED ON GREEN GO LIGHT ILLUMINATED. GVI OF CONT CABIN TEMP SENSOR & FAN = MOSTLY COVERED IN FUZZ / DUST WITH VERY LITTLE AIRFLOW, CLEANED FAN AND TEMP SENSOR. OPERATED R & L PACK SYSTEMS AGAIN AND ALL ZONE TEMP CONTROLS OPERATE APPROPRIATELY WITH NO FAULTS NOTED ON #1 & #2 PZTC BITE TEST. REF B737-800 FIM 21-62 TASKS 842 & 801, & B737-800 AMM 21-61-10.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.