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For an autostart or a manual start on the ground, the EEC lets only one ignition exciter get power. The choice of the ignition exciter changes for each ground start. If the engine fails to start, the EEC supplies power to the two ignition exciters on the second try.
During a normal in-flight start, the EEC selects the two ignition exciters to get power.
When the start/ignition selector is in the NORM position, the two ignition exciters operate when the engine anti-ice is on, or the flaps are not retracted. The ACIPS supplies the engine anti-ice signal and the FSEU supplies flap position. The EDIU gets the data from the ARINC 629 systems buses and sends it to the EEC. The EEC automatically supplies power to the two ignition exciters.
When the start/ignition selector is in the CON position, the EDIU gets the switch position signal from the ARINC 629 system busses. This signal causes the EEC to operate the two ignition exciters continuously.

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IGNITION -FUNCTIONAL DESCRIPTION

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IGNITION -OPERATION

The electronic engine control (EEC) controls the operation of the ignition system. The EEC gets the start/ignition selector position to set these modes of operation for the ignition system:
*
Engine start ignition

*
Automatic ignition

*
Continuous ignition.

 

The fuel control switch must be in the RUN position for the ignition system to operate.
Engine Start Ignition

When you do an autostart or manual start of the engine, the EEC selects which ignition exciter to operate. It operates that exciter for two successful engine starts (autostart or manual), then operates the other exciter for the next engine start.
On the first ground start (autostart or manual) the EEC uses one igniter plug. If the engine fails to start during an autostart attempt, the EEC aborts the start attempt, motors the engine for 30 seconds, and then attempts a second start using two igniter plugs.
For all in-flight restarts, the EEC operates the two igniter plugs.
During an autostart, the EEC operates the ignition system at the fuel-on speed, 15 -28 percent N2. For a manual start, the ignition system operates when you put the fuel control switch in the RUN position at 15 percent N2 (minimum).
The EEC removes power to the igniter plug(s) at starter cutout speed, 41 percent N2.
Automatic Ignition
When the start/ignition selector is in the NORM position, the EEC uses the two igniter plugs. The EEC automatically supplies power to the igniter plugs when any of these conditions occur:
　
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