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R A. Ignition Exciters R (Ref. Fig. 001)
R (1) General R There are 2 ignition exciters which are mounted on the fan case with R resilient shock mounts. The ignition exciters provide starting and R continuous duty ignition on demand. Each ignition exciter is capable R of independent operation and alternate use of ignition circuits is R recommended.
R (2) Description R The ignition exciter is a capacitor discharge type exciter requiring R an input of 115V (108 to 122 volts AC) at 400Hz (380 to 420Hz). The R output voltage is 15 to 20KV at the end of a 13 foot ignition lead. A R tin plated aluminium housing encloses the exciter and the components R of the exciter are secured mechanically or with silicone adhesive to R the housing. The housing is hermetically sealed to ensure proper R operation under varying environmental conditions.
R (3) Operation R The ignition exciter consists of an input circuit (filter network and R power transformer), rectifier circuit and storage capacitor circuit, R and a discharge circuit. The alternating current input is rectified R and stored in the capacitors. When the capacitors reach approximately R 2850 volts each they discharge a combined voltage of approximately R 5700 volts.
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R R  Ignition Exciters Figure 001
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 IGNITION EXCITER (4000JH1,4000JH2) - REMOVAL/INSTALLATION

_________________________________________________________
 TASK 74-11-10-000-002
 Removal of the Ignition Exciter (4000JH1, 4000JH2)

R WARNING : BE SURE EXCITERS ARE DE-ENERGIZED FOR AT LEAST 5 MINUTES BEFORE
_______ R WORKING ON THE IGNITION SYSTEM. VOLTAGE OUTPUT CAN BE DANGEROUS. DO R NOT TOUCH THE ELECTRICAL CONTACTS, EXCITERS MAY CONTAIN AN ELECTRICAL R CHARGE EVEN WHEN THEY ARE NOT ENERGIZED.
R
 1. Reason for the Job

__________________
 Self Explanatory

 2. Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
 No specific circuit breaker(s) safety clip(s)
 No specific warning notice

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors
 74-11-10-991-300 Fig. 401

 3. Job Set-up
__________
 Subtask 74-11-10-941-053

 A. Safety Precautions
 (1) On the center pedestal, on the ENG panel 115VU:

 (a) Put a warning notice to tell persons not to start the engine.
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 (2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.

 (3) On the overhead maintenance panel 50VU:
 (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

 (b) Put a warning notice to tell persons not to energize the FADEC 1(2).

 Subtask 74-11-10-865-057
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU ENGINE/1 AND 2/IGN/SYS A 1JH A03
 FOR 1000EM1 121VU ENGINE/IGN/ENG1/SYS B 3JH1 P41 121VU ENGINE/IGN/ENG1/SYS A BAT 2JH1 P39
 FOR 1000EM2 121VU ENGINE/IGN/ENG2/SYS B 3JH2 P42 121VU ENGINE/IGN/ENG2/SYS A BAT 2JH2 P40
 Subtask 74-11-10-010-054
 C. Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 4. Procedure
_________
 (Ref. Fig. 401/TASK 74-11-10-991-300)
 Subtask 74-11-10-020-053
　
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