___________________________________________
 TASK 74-21-20-000-002
 Removal of the Left Ignition Lead
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
 CAUTION : BE CAREFUL WITH THE IGNITION LEAD TO PREVENT DAMAGE TO THE CONDUIT
_______
 AND THE INTERNAL WIRES.

 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
 No specific access platform 1 m (3 ft. 3 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors
 78-30-00-481-041 Make the Thrust Reverser Unserviceable for

 Maintenance
 78-36-00-010-040 Opening of the Thrust Reverser Doors
 74-21-20-991-300 Fig. 401
 74-21-20-991-301 Fig. 402

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 3. Job Set-up
__________
 Subtask 74-21-20-941-052
 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.

 (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 74-21-20-865-055
 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 74-21-20-010-055
 C. Get Access
 (1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 (2) Put the access platform in position.

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 E 56-5B E E E Subtask 74-21-20-040-054

 D. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041). Subtask 74-21-20-010-058
 E. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040)
 FOR 1000EM1
 451AL, 452AR
 FOR 1000EM2
 461AL, 462AR

 4. Procedure
_________ (Ref. Fig. 401/TASK 74-21-20-991-300, 402/TASK 74-21-20-991-301) Subtask 74-21-20-020-054
 A. Removal of the ignition lead
 (1) Disconnect the ignition lead from the aft side of the lower ignition exciter on the fan inlet case.

 (2) Put blanking caps on the disconnected electrical connectors.

 (3) Remove the ignition lead from the clamps on the core engine.

 (4) Remove the shroud clamp and the cooling shroud from the igniter end of the ignition lead.

 (5) Loosen the coupling nut and remove the ignition lead CAUTION : BE VERY CAREFUL WHEN YOU LOOSEN THE COUPLING NUT OF THE

_______ IGNITION LEAD. IF NOT YOU CAN DAMAGE THE ADJACENT TUBING.
 CAUTION : MAKE SURE THAT THE FIRST HINGE-TYPE CLAMP IS RELEASED
_______ BEFORE YOU REMOVE THE IGNITION LEAD FROM THE SPARK IGNITER. THIS WILL PREVENT DAMAGE TO THE CERAMIC TIP ON THE IGNITER END OF THE IGNITION LEAD.
 (a) Loosen the coupling nut and remove the ignition lead from the spark igniter. Pull the ignition lead straight out (no side loading) until free from the igniter.
　
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