DOC AIRBUS | AMM A320FDISTRIBUTION - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. Description
The ignition for each engine is carried out by means of one or both ignition exciters which transform(s) the 115 V - 400 Hz power supply into high voltage pulsating current.
The high voltage flows through the ignition lead (shielded and ventilated) and delivers to the igniter plug the power required to initiate the fuel/ air mixture combustion by a serie of sparks.
The ignition for each engine is carried out by means of one or both ignition exciters which transform(s) the 115 V - 400 Hz power supply into high voltage pulsating current.
The high voltage flows through the ignition lead (shielded and ventilated) and delivers to the igniter plug the power required to initiate the fuel/ air mixture combustion by a serie of sparks.
A. Ignition Leads
The air-cooled ignition lead is part of an ignition system having two separate channels. The approximate length of the leads is three feet (0,90 meter).
The air-cooled ignition lead has two conductive paths : one connects the exciter and the center electrode of the igniter plugs, the other is the return path from the igniter body to the case of the exciter.
The air-cooled ignition lead is connected to the output end of the exciter and to the input end of the igniter plug. When the exciter discharges the stored energy, the energy goes through the ignition lead to the igniter plug.
Ignition system A comprises the upper ignition exiter and its associated cable and igniter, ignition system B comprises the lower ignition exiter and its associated cable and igniter.
Ignition leads cooling is described in chapter 75-27
The air-cooled ignition lead is part of an ignition system having two separate channels. The approximate length of the leads is three feet (0,90 meter).
Ignition LeadThe air-cooled ignition lead has two conductive paths : one connects the exciter and the center electrode of the igniter plugs, the other is the return path from the igniter body to the case of the exciter.
The air-cooled ignition lead is connected to the output end of the exciter and to the input end of the igniter plug. When the exciter discharges the stored energy, the energy goes through the ignition lead to the igniter plug.
Ignition system A comprises the upper ignition exiter and its associated cable and igniter, ignition system B comprises the lower ignition exiter and its associated cable and igniter.
Ignition leads cooling is described in chapter 75-27
B. Igniter plug
(1) General
The igniter plug is one of the components of the ignition system.
Two igniter plugs are installed on the diffuser case.
The igniter plug has three sections:
The igniter plug is one of the components of the ignition system.
Two igniter plugs are installed on the diffuser case.
The igniter plug has three sections:
- the sparking end with the surface gap.
- the main body with the plug thread.
- the connector to connect the ignition lead.
(2) Operation
When a high voltage pulse from the ignition exciter is delivered to the igniter plug, the surface gap is ionized and becomes conductive.
The capacitor (in the ignition exciter) discharges the stored energy across the surface gap.
This gives off a spark with high energy at the sparking end.
This spark ignites to the fuel-air mixture in the diffuser case.
When a high voltage pulse from the ignition exciter is delivered to the igniter plug, the surface gap is ionized and becomes conductive.
The capacitor (in the ignition exciter) discharges the stored energy across the surface gap.
This gives off a spark with high energy at the sparking end.
This spark ignites to the fuel-air mixture in the diffuser case.