DOC AIRBUS | AMM A320FIGNITION - GENERAL - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The ignition system consists of 2 independent systems : 2 high energy ignition exciters for which the energization is controlled by the ECU, 2 spark igniters, and 2 coaxial shielded ignition leads.
The purpose of the system is :
** ON A/C NOT FOR ALL The ignition system consists of 2 independent systems : 2 high energy ignition exciters for which the energization is controlled by the ECU, 2 spark igniters, and 2 coaxial shielded ignition leads.
Ignition SystemThe purpose of the system is :
- to produce an electrical spark to ignite the fuel air/mixture in the engine combustion chamber during the starting cycle on ground and in flight.
- to provide continuous ignition (manual or automatic selection) during takeoff, landing and operation in adverse weather conditions or EIU failed.
2. Description
A. Ignition Exciters
The 2 ignition exciters are mounted on shock dampened brackets on the outer surface of the fan case. Each exciter has an input connector and an output connector.
The 2 ignition exciters are mounted on shock dampened brackets on the outer surface of the fan case. Each exciter has an input connector and an output connector.
B. Spark Igniters
The 2 spark igniters are mounted into bosses at the 4 and 8 o'clock positions on the outer surface of the combustion case. The inner tip extends through ferrules in the outer liner of the combustion chamber.
The 2 spark igniters are mounted into bosses at the 4 and 8 o'clock positions on the outer surface of the combustion case. The inner tip extends through ferrules in the outer liner of the combustion chamber.
C. Ignition Leads
The ignition leads are constructed of insulated wire in a sealed flexible conduit having a copper inner braid and a nickel outer braid. The leads connect the spark igniters to the output connectors of the ignition exciters. The aft ends of the leads, from the tube bundle junction box to the spark igniters, are cooled by fan discharge air passing through the lead conduit (the ignition system cooling is described in ref. 75-27-00).
The ignition leads are constructed of insulated wire in a sealed flexible conduit having a copper inner braid and a nickel outer braid. The leads connect the spark igniters to the output connectors of the ignition exciters. The aft ends of the leads, from the tube bundle junction box to the spark igniters, are cooled by fan discharge air passing through the lead conduit (the ignition system cooling is described in ref. 75-27-00).
D. Igniter Logic
For ground auto-starts performed above 10000 ft. (3048 m) and when the engine is cold, the FADEC will turn on 1 igniter for light-off and then turn on both igniters after light-off is detected.
For ground auto-starts performed above 10000 ft. (3048 m) and when the engine is cold, the FADEC will turn on 1 igniter for light-off and then turn on both igniters after light-off is detected.
3. Operation
The ignition exciters operate with 115V(105-122V)-400Hz input. The power is transformed, rectified and discharged in the form of capacitor discharge pulses through the ignition leads to the spark igniters. Each engine circuit is capable of independent operation and is selected by ENG/MASTER 1 (2) control lever in the cockpit center pedestal.
** ON A/C NOT FOR ALL The ignition exciters operate with 115V(105-122V)-400Hz input. The power is transformed, rectified and discharged in the form of capacitor discharge pulses through the ignition leads to the spark igniters. Each engine circuit is capable of independent operation and is selected by ENG/MASTER 1 (2) control lever in the cockpit center pedestal.
4. Component Location
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| FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA |
| I I I I DOOR I REF. |
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| 4000JH1 EXCITER-IGNITION, A 436 438AR 74-11-10 |
| 4000JH2 EXCITER-IGNITION, B 446 448AR 74-11-10 |
| IGNITER-L SPARK, ENG 1 453 451AL 74-21-30 |
| IGNITER-R SPARK, ENG 1 454 452AR |
| IGNITER-L SPARK, ENG 2 463 461AL |
| IGNITER-R SPARK, ENG 2 464 462AR |
| RIGHT IGNITION LEAD 74-21-10 |
| LEFT IGNITION LEAD 74-21-20 |