# SDR ASAA2014060208017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 2, 2014
- Submitted: June 4, 2014
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 23,507 hours, 7,316 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3966081
- Part serial: 2655
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 27,907 hours, 8,310 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2014060208017

## Discrepancy

DURING TAXI OUT,  N1 SETTINGS ON TAKE OFF PAGE DID NOT MATCH.  ACFT GROUNDED. VERFIED LT PACK INTERMITTENTALLY TURNED ON- SHOWS ON FMC DISCRETE PAGE. DURING TROUBLESHOOTING NOTED FMC DISCRETE SHOWED LT PACK FLOW CONTROL VALVE ON WITH THE VALVE CLOSED. JUMPERED CONNECTOR D486L PIN 3 TO 1 GROUND AND DISCRETE TURNED TO OFF.  REPLACED THE LEFT FLOW CONTROL AND SHUTOFF VALVE IAW MM 21-51-01. LEAK AND OPS CKS GOOD. TAXI OF ACFT SHOWED NO FURTHER DEFECTS.

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