# SDR COZA20170713109

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2017
- Submitted: July 14, 2017
- Operation: Air carrier
- Aircraft: [N737KA](https://openairdocs.org/aircraft/N737KA), registered now
- Make and model: Boeing 737-7BX
- Registry model: [Boeing 737-7BX](https://openairdocs.org/model/boeing-737-7bx) (OpenAirDocs)
- Aircraft serial: 30740
- Aircraft time: 29,285 hours, 17,170 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Controller
- Part number: 6075103
- Part serial: 090C10110
- Condition: Failed
- Location: Ac Bay
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COZA20170713109

## Discrepancy

LEFT PACK OUTPUT TEMPERATURE APPEARS TO BE WARMER THAN THE RIGHT PACK ON THE GROUND.  PERFORMED BITE CHECK ON THE CABIN TEMPERATURE CONTROLLER PER THE FIM WITH NO FAULTS DISPLAYED.  PERFORMED BITE CHECK OF LEFT AND RIGHT 35 DEG CONTROLLERS.  CONTROLLER FAULT WAS DISPLAYED ON THE LEFT CONTROLLER.  REPLACED LEFT 35 DEG CONTROLLER.  OPERATIONAL CHECK NORMAL.

---
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.