B737点火系统维修手册英文翻译-2017年10月.doc

B737 Ignition IGNITION – INTRODUCTION IGNITION - GENERAL DESCRIPTION IGNITION - ENGINE COMPONENT LOCATION IGNITION - FLIGHT COMPARTMENT COMPONENT LOCATIONS IGNITION - IGNITION EXCITER IGNITION - DISTRIBUTION - IGNITION LEADS AND SPARK IGNITERS IGNITION - FUNCTIONAL DESCRIPTION IGNITION – OPERATION IGNITION - TRAINING INFORMATION POINT IGNITION - INTRODUCTION General The ignition systems supply electrical sparks in the combustion chamber for combustion. Each engine has two ignition systems that operate independently. The ignition system usually operates manually. However, the ignition systems operate automatically when the electronic engine control (EEC) sees a possible engine flameout condition. You use ignition during these times: 1. Ground start 2. Takeoff and landings 3. In-flight (during heavy turbulence or bad weather) 4. In-flight start. Abbreviations and Acronyms 1. CDS - common display system 2. CDU - control display unit 3. CONT - continuous 4. DEU - display electronics unit 5. EEC - electronic engine control 6. FLT - flight 7. FMC - flight management computer 8. GRD - ground 9. IGN - ignition 10. L - left 11. R – right IGNITION - INTRODUCTION IGNITION - GENERAL DESCRIPTION General These components control ignition: 1. Start levers 2. Start switches 3. Ignition selector switch 4. Electronic engine control (EEC). The start lever controls ignition system power to the EEC. The start switch and the ignition selector switch supply inputs to the EEC. The EEC uses these inputs to supply power to the ignition exciters. The ignition exciters supply power to the spark igniters. The engine starting system also uses the switch positions for control. See the engine starting chapter for more information Electrical Power The engine 1 ignition systems receive 115v ac from ac transfer bus 1 and the ac standby bus. The EEC has internal switches that control the 115v ac to the ignition exciters. The ignition exciters change the 115v ac input to a dc voltage of approximately 1