# SDR ASAA2018082125864

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 20, 2018
- Submitted: August 21, 2018
- Operation: Air carrier
- Aircraft: [N493AS](https://openairdocs.org/aircraft/N493AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41727
- Aircraft time: 9,235 hours, 3,135 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Controller
- Condition: Faulted
- Location: Nr 2
- Stage of operation: TX
- 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/ASAA2018082125864

## Discrepancy

AFTER START CHECK, THE RIGHT PACK ILLUMINATED & EXTINGUISHED WHEN MASTER CAUTION SYSTEM WAS RESET.  ACFT GROUNDED. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE CK ON BOTH TEMP CONTROLLER'S. NR 1 CONTROLLER OP'S CK GOOD NO FAULTS NOTED.  NR 2 CONTROLLER SHOWED ONE FAULT FOR THE TCV,   WAS ABLE TO RESET THE FAULT.  RAN A BITE CHECK ON THE NR 2 CONTROLLER AGAIN NO FAULTS NOTED TEST PASSED IAW AMM 21-61-00-700-806-002.

---
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.