(2) Connect the power supply cable to the electrical input connector on the forward side of the exciter. Tighten the connector nut with your hand, plus one-eight of a turn. If necessary, use soft-nose pliers.
Subtask 74-11-10-865-063
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1JH FOR 1000EM1 2JH1, 3JH1 FOR 1000EM2 2JH2, 3JH2
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D. Perform an operational test of the ignition system (Ref. TASK 74-00-00-710-043).
NOTE : As an alternative procedure you can do this test without the CFDS
____
(Ref. TASK 74-00-00-710-043).
5. Close-up
________ Subtask 74-11-10-410-055
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(3) Remove the warning notice(s).
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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 through the ignition lead (shielded and ventilated) delivers to the spark igniter the power required to initiate the fuel/ air mixture combustion by a series of sparks.
A. Ignition Leads (Ref. Fig. 001, 002) An ignition lead transmits electrical energy from an ignition exciter to a spark igniter. Each lead consists of a 0.28 in. (7 mm) diameter silicone insulated cable containing a No. 14 AWG nickel plated copper stranded conductor. The 0.28 in. (7 mm) cable is housed within a flexible conduit which features a nickel plated copper inner braid, a nickel-iron convoluted conduit, and a nickel outer braid. Fan discharge air is introduced into an enlarged diameter portion of each ignition lead conduit for cooling of the silicone insulated cable and igniter connection.
B. Spark Igniter
(Ref. Fig. 001, 002)
(1) General There are 2 spark igniters in combustion case bosses at the 4 and 8 o'clock position, aft looking forward, on the combustion case assembly. The tip of the spark igniters extends through ferrules in the outer liner into the combustion chamber. Each spark igniter is connected by an ignition lead to an ignition exciter. When charged by a high voltage from the ignition exciter, the spark igniter provides an arc to ignite the fuel being injected into the combustion chamber by the fuel nozzle assemblies.
(2) Operation When the ignition exciter discharges the high voltage pulses through the ignition lead to the spark igniter, electric arc pulses occur between the center electrode and the outer electrode, and an ionized discharge occurs. The hot ion discharge ignites the fuel injected by the fuel nozzles. The electrical pulse discharges continue until electrical supply to the ignition exciter is discontinued.
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Ignition Lead
Figure 001
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Ignition Leads and Left/Right Spark Igniter
Figure 002
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IGNITION LEAD (RIGHT) - REMOVAL/INSTALLATION
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