Uncommanded Continuous Ignition on Engine 2 After Engine Start

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1. Possible Causes
· wiring from the ANTI ICE/ENG 2 pushbutton switch (2DN2) and the EIU-2 (1KS2)
· wiring from the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) to the EIU-2 (1KS2)
· EIU-2 ( 1KS2 )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. ASM 73-25-08
Ref. AMM 73-25-34-000-041 Removal of the Engine Interface Unit (EIU)
Ref. AMM 73-25-34-400-041 Installation of the Engine Interface Unit (EIU)
3. Fault Confirmation
Subtask 74-00-00-710-098-A
A. Test
(1) Not applicable, the fault is evident.
4. Fault Isolation
Subtask 74-00-00-810-075-B
A. If the fault symptom is identified by the crew observation ENG 2 - Uncommanded continuous IGNITION
after engine start:
· Do a check of the wiring from the ANTI ICE/ENG 2 pushbutton switch (2DN2) and the EIU-2 (1KS2) :
. Pin AA/B2 to pin AA/5C Ref. ASM 73-25-08.
(1) If the fault continues:
· Do a check of the wiring from the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) to the
EIU-2 (1KS2) :
. Pin 23 to pin AA/1A
. Pin 24 to pin AA/1B Ref. ASM 73-25-08.
(2) If the fault continues:
· Replace the EIU-2 ( 1KS2 ) Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
Subtask 74-00-00-710-099-A
B. After the subsequent flight, make sure that the fault does not continue.
Figure 74(IAE)-00-00-991-00100-13-A- / SHEET 1/1 - Relay Box
Figure 74(IAE)-00-00-991-00200-13-A- / SHEET 1/1 - Relay Box 1(2)
End of document [Rev.6 from Feb 2017] 2026.04.04 04:37:00 UTC