(b) If an audible spark is not heard:
- replace the lower exciter box (Ref. AMM TASK 74-11-10-000-002) and (Ref. AMM TASK 74-11-10-400-002).
(c) If an audible spark is not heard:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(d) If an audible spark is not heard:
- replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
(2) If an audible spark can be heard on the left igniter plug (B): R - replace the left ignition lead (Ref. AMM TASK 74-21-20-000-002) and R (Ref. AMM TASK 74-21-20-400-002).
(3) If an audible spark can be heard on the left igniter plug (B), but the failure message is repetitive:
- do the following steps after trouble shooting per steps Para. 4.A.(2). has been fully done,
- replace the igniter B (left igniter plug) (Ref. AMM TASK 74-21-30-000-002) and (Ref. AMM TASK 74-21-30-400-002).
(a) If the fault continues during subsequent flights:
- replace the lower exciter box (Ref. AMM TASK 74-11-10-000-002) and (Ref. AMM TASK 74-11-10-400-002).
(b) If the fault continues during subsequent flights:
- replace the HJ2 harness (Ref. AMM TASK 71-52-43-000-004) and (Ref. AMM TASK 71-52-43-400-004).
(c) If the fault continues during subsequent flights:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(d) If the fault continues during subsequent flights:
- replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
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E F 『 E C F M E E E E 56 E E E B. Do the test given in Para. 3.A.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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TASK 74-00-00-810-804
Failure of the Ignition 2 System - Engine 2 - Channel A or Channel B
1. Possible Causes
_______________
- left igniter plug (B)
- left ignition lead
- lower exciter box
- ECU (4000KS)
- HJ2 harness
- EIU-2 (1KS2)
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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