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B737 Ignition

1. IGNITION ¨C INTRODUCTION 2. IGNITION - GENERAL DESCRIPTION

3. IGNITION - ENGINE COMPONENT LOCATION

4. IGNITION - FLIGHT COMPARTMENT COMPONENT LOCATIONS 5. IGNITION - IGNITION EXCITER

6. IGNITION - DISTRIBUTION - IGNITION LEADS AND SPARK IGNITERS 7. IGNITION - FUNCTIONAL DESCRIPTION 8. IGNITION ¨C OPERATION

9. 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 ¨C 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 15,000 to 20,000v for the spark igniters. The spark igniters give a spark for combustion. The ignition systems of engine 2 receive ac power from ac transfer bus 2 and the ac standby bus.

IGNITION - GENERAL DESCRIPTION IGNITION - ENGINE COMPONENT LOCATION

General

Each engine has a right and a left ignition system. These are the components of each ignition system: 1. Ignition exciter 2. Ignition lead 3. Air manifold 4. Spark igniter. Component Locations

The ignition exciters are on the right side, lower portion, of the fan case. The ignition leads go from the ignition exciters to the spark igniters on the right and left sides of the engine.

The air manifold goes around the ignition leads. The air manifold starts in the 6:00 strut and goes to the igniters.