Boeing 737 NG Systems Review
Forward Overhead Panel  700/800/900
Display Selector
Engine Start Panel
Ignition Select Switch

IGN L – Selects the left igniter for use on both engines.

BOTH – Selects both igniters for use on both engines.

IGN R – Selects the right igniter for use on both engines.


Each engine has two igniter plugs. The EEC arms the igniter
plug(s) selected by the ignition select switch. The left igniter plug
receives power from the associated AC transfer bus.
The right
igniter plug receives power from the AC standby bus
.