# SDR CALA2013092691483

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 25, 2013
- Submitted: October 14, 2013
- Operation: Air carrier
- Aircraft: [N228UA](https://openairdocs.org/aircraft/N228UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30556
- Aircraft time: 50,077 hours, 6,036 cycles
- Engine: Pwa PW40903
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 329074410
- Part serial: 54
- Condition: Malfunctioned
- Location: Nr 1
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2013092691483

## Discrepancy

LT ENGINE BLEED FAN AIR MODULATING VALVE DEACTIVATED.  WIRING CHECKED FROM E/E CONNECTOR DM36111A TO VALVE, IAW WDM 36-11-13.  LEAK CHECKED MUSCLE LINE FROM HPFA CONTROL TO VALVE, NO FAULTS NOTED.  REPLACED LT ENGINE FAN AIR MODULATING VALVE IAW AMM, NO FAULTS NOTED ON ENGINE RUN.

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