The Faults Analysis of HPTACCV Fuel Leakage on CFM56-5B Engine

The high pressure turbine clearance control valve (HPTACCV) fuel leakage on CFM56-5B engine can cause some flight delays and cancellations. The basic structure of HPTACCV is introduced. The root cause of the fuel leakage is given. In the field, to provide a more reliable engine, Weibull Analysis can be used to determine the soft time. This paper presents how to use Weibull Distribution to calculate the soft time life and forecast the spare parts equipments. This method can be used to evaluate the other failures of the aero engine components.