# SDR AWXA200400027

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2004
- Submitted: January 12, 2004
- Operation: Air carrier
- Aircraft: [N303AW](https://openairdocs.org/aircraft/N303AW), registered now
- Make and model: Boeing 737-3G7
- Registry model: [Boeing 737-3G7](https://openairdocs.org/model/boeing-737-3g7) (OpenAirDocs)
- Aircraft serial: 24010
- Aircraft time: 49,945 hours, 34,739 cycles
- System (JASC): [3020 · Air Intake Anti/De-Ice System](https://openairdocs.org/jasc/3020)
- Part: Anti-Ice Valve
- Part number: 1726257
- Part serial: 2147C
- Condition: Binding
- Location: Rt Engine
- Part time: 16,217 hours, 10,071 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AWXA200400027

## Discrepancy

PHX - AIR TURNBACK - FLT 0071 - ON CLIMBOUT, EN ROUTE. THE RT ENG ANTI-ICE COWL VALVE OPEN LIGHT REMAINED INTRANSIT, VALVE NEVER OPENED OR INDICATED A DECREASE IN DUCT PRESSURE.  TURNED BACK & LANDED WITHOUT FURTHER EVENT.  MAINT R & R RT ENG INLET COWL THERMAL ANTI-ICE VALVE IAW BMM 30-21-11, OPERATIONAL CHECK GOOD. INDUCTION TEST OF ENG INLET COWL THERMAL ANTI-ICE VALVE CONFIRMED FAILURE OF UNIT FOR EXCESSIVE PORT & CASE LEAKAGE, & LOW REGULATION. DISASSY OF UNIT FOUND BOTH FLOW BODIES, SEALS, DIAPHRAGM, POPPET ASSY, & RING WORN BEYOND LIMITS. REPLACED FLOW BODIES, SEALS, DIAPHRAGM RING. BUSHINGS , BEARINGS, POPPET ASSY, & MINOR HARDWARE. UNIT FUNCT TESTED & RETURNED TO SERVICE.

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