FM 1-506 Fundamentals of Aircraft Power Plants ... - Survival Books
FM 1-506 Fundamentals of Aircraft Power Plants ... - Survival Books
FM 1-506 Fundamentals of Aircraft Power Plants ... - Survival Books
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WWW.SURVIVALEBOOKS.COM<strong>FM</strong> 1-<strong>506</strong>Radio frequency energy is generated within the exciterduring normal operation. An inductive capacitivefilter has been incorporated at the input. This will preventenergy from being fed back onto the 28-volt input line.Radio frequency interference on this line could damagethe operation <strong>of</strong> other electrical accessories. The filter isturned to radio frequencies. It does not <strong>of</strong>fer any appreciableopposition to the flow <strong>of</strong> 28-volt direct current.The ignition lead and coil assembly constitutes thehigh potential ignition wiring. This assembly incorporatestwo coils fed with high voltage from the twooutputs <strong>of</strong> the ignition exciter. The coil assemblies functionas spark splitters distributing high voltage to fourigniter plugs. Each coil assembly has one input and twooutputs. The coil windings forma transformer having a1:1 ratio. Any current flowing through either winding willinduce a voltage across the other. Even a shortenedigniter plug will not short out the high-voltage ignitionsignal. The entire wiring harness is shielded andgrounded at airframe potential to suppress radiation <strong>of</strong>radio frequency interference.6-7
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