R (d) If an audible spark is not heard:
R - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and
R (Ref. AMM TASK 73-25-34-400-040).

R (2) If an audible spark can be heard on the right igniter plug (A):
R - replace the right ignition lead (Ref. AMM TASK 74-21-10-000-002)
R and (Ref. AMM TASK 74-21-10-400-002).

R (3) If an audible spark can be heard on the right igniter (A), but the
R failure message is repetitive:
R - do the following steps after trouble shooting per steps Para.
R 4.A.(2). has been fully done,
R - replace the igniter A (right igniter plug) (Ref. AMM TASK 74-21-30-R 000-002) and (Ref. AMM TASK 74-21-30-400-002).

R (a) If the fault continues during subsequent flights:
R - replace the upper exciter box (Ref. AMM TASK 74-11-10-000-002)
R and (Ref. AMM TASK 74-11-10-400-002).

R (b) If the fault continues during subsequent flights:
R - replace the HJ1 harness (Ref. AMM TASK 71-52-43-000-004) and
R (Ref. AMM TASK 71-52-43-400-004).

R (c) If the fault continues during subsequent flights:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and
R (Ref. AMM TASK 73-21-60-400-001).

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R  (d) If the fault continues during subsequent flights: 
R  - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and 
R  (Ref. AMM TASK 73-25-34-400-040). 
R 
R  B. Do the test given in Para. 3.A. 
R  (1) No additional maintenance action is required if the fault is not 
R  confirmed. 
R  (2) Repeat the fault isolation procedure if the fault continues. 
R

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 TASK 74-00-00-810-803
 Failure of the Ignition 2 System - Engine 1 - Channel A or Channel B
 1. Possible Causes
_______________
 - left igniter plug (B)

 - left ignition lead

 - lower exciter box

 - ECU (4000KS)

 - HJ2 harness

 - EIU-1 (1KS1)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 71-52-43-000-004 Removal of the Environmental Control System (ECS) Harness AMM 71-52-43-400-004 Installation of the Environmental Control System
 (ECS) Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 73-25-34-000-040 Removal of the Engine Interface Unit (EIU) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU) AMM 74-00-00-710-040 Operational Test of the Ignition System AMM 74-11-10-000-002 Removal of the Ignition Exciter (4000JH1, 4000JH2) AMM 74-11-10-400-002 Installation of the Ignition Exciter (4000JH1,
 4000JH2)

R  AMM 74-21-20-000-002 Removal of the Left Ignition Lead
R  AMM 74-21-20-400-002 Installation of the Left Ignition Lead AMM 74-21-30-000-002 Removal of the Spark Igniter AMM 74-21-30-400-002 Installation of the Spark Igniter
 3. Fault Confirmation
__________________
 A. Do the operational test of the ignition system, by performing an aural check of the igniter plug operation (Ref. AMM TASK 74-00-00-710-040).
 NOTE : The igniter test will spark the right igniter plug (A) for 10
____ seconds, wait 2 seconds then spark the left igniter plug (B) for 10 seconds. This test provides for an aural feedback of proper ignition operation . No CFDS test results are available.
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 4. Fault Isolation
_______________
　
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