CFM HPTACC Valve Fuel Leakage

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CFM HPTACC Valve Fuel Leakage

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HPTACC
Valve Fuel
Leakage
2
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited
• Background
- HPTACC valve overboard leakage
- Occurring 3000 to 5000 TSN
- Exceeds AMM limits
• Findings
- Piston rod surface finish anomaly.....orange peel condition
- Complies with surface finish requirements
- Excessive wear of Teflon slipper seal
- 165 valves, 21 Airlines affected - S/N 2102 thru 2361
CFM56-5B - HPTACC Valve Fuel Leakage
Slipper Seal Orange peel condition
3
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited
• Corrective Actions
- Process changed to Chrome Plate
- Grind prior to plating, establish surface finish
- Chrome plate
- Finish grind after plating to final dimension and finish
- Assures consistent surface finish
.
• Field Plan
- Recommend removal of suspect units prior to 5000 TSN
- Whittaker Service Letter SL2002-02 issued Mar 20, 2002
CFM56-5B - HPTACC Valve Fuel Leakage
Whittaker Will Replace Pistons at No Charge