飞机启动系统_附件.ppt

Contents General description The ducting system and SOV Starter Switching The start sequence Functional block Fault reasons Fault tree and isolation procedure General Description CFM56-5C Manufactured by CFM International Used on Airbus A340-200 and A340-300 Thrust rating: 31200~~34000 lb.f Features: Lowest SFC of CFM56 family Lower noise High thrust-to-weight ratio Second-generation FADEC Long-duct, mixed-flow nacelle 5.Structural Data 1 stage fan and 4 stage booster 9 stage compressor 4 stage HP turbine 1 stage LP turbine Ducting system Air come from three source: APU Ground air cart Other engine RH and LH connect through a cross bleed valve Check valve to protect APU Ducting system Shut-off valve Between the top and lower duct Used to control the air quantity Controlled by ECU Starter Switching Each pushbutton serves for: manual start motoring Enable start sequence Choose work condition To start: 1:ENG START set to IGN/START 2:ENG MASTER to “ON” Start sequence Stage 1: Starter drive Engine (open SOV) Stage 2: Turbine start drive Engine (N222% ignition) Stage 3: starter stop working (N250 close SOV cut ignition) 1 2 3 Functional diagram Functional diagram Fault Reasons Top and lower starter duct ( duct and connections leak) Starter SOV ( can’t open fully) Starter (tears and FOD or high friction) 1 2 3 Fault Tree Fault Isolation * *