# SDR UALA2012080104139

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 30, 2012
- Submitted: August 1, 2012
- Operation: Air carrier
- Aircraft: [N197UA](https://openairdocs.org/aircraft/N197UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 26901
- Aircraft time: 60,764 hours, 7,171 cycles
- Engine: Pwa PW4056
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Message
- Condition: False Indication
- Location: A/C Pack
- Stage of operation: NR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012080104139

## Discrepancy

NR 1 PACK EICAS STATUS MESSAGE DISPLAYED.  NEITHER PAC TEMP CONTROLLERS IN CONTROL OF PACK 1 OR PACK COMPONENT FAILURE OR OVERHEAT OR PACK TRIP DUE TO OVERHEAT OR OUT OF SEQUENCE. THE NR 1 PACK FLOW CONTROL VALVE IS SECURED CLOSED.  PACK IS INOPERATIVE EICAS MESSAGE: TURB BYPASS VALVE -1 WIRING FAIL MSG:21118A.  RAN PACK SEVERAL TIMES FOR PROLONG PERIODS AND RAN CMC CHECKS.  PACK RAN NORMAL WITH NO FAULTS ON STATUS OR THRU CMC.

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