Uncommanded Continuous Ignition on Engine 1 After Engine Start

TASK 74-00-00-810-820-A
Uncommanded Continuous Ignition on Engine 1 After Engine Start

1. Possible Causes

wiring from the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) to the EIU-1 (1KS1)
EIU-1 [1KS1]
VALVE-ENG AIR INTAKE ANTI ICE [4000DN]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 30-21-51-000-040	Removal of the Engine Air-Intake Anti-Ice Valve
AMM 30-21-51-400-041	Installation of the Engine Air-Intake Anti-Ice Valve
ASM 732508
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)

3. Fault Confirmation
Subtask 74-00-00-710-100-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable, the fault is evident.

4. Fault Isolation
Subtask 74-00-00-810-076-C ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the crew observation ENG 1 - Uncommanded continuous IGNITION after engine start:

do a check of the wiring from the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) to the EIU-1 (1KS1)
. pin 3 to pin AA/1A
. pin 4 to pin AA/1B ASM 732508.

(1) If the fault continues:

(2) If the fault continues:

remove and replace the VALVE-ENG AIR INTAKE ANTI ICE [4000DN] AMM 30-21-51-000-040 and AMM 30-21-51-400-041.

Subtask 74-00-00-810-076-E ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the crew observation ENG 1 - Uncommanded continuous IGNITION after engine start:

do a check of the wiring from the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) to the EIU-1 (1KS1)
. pin 3 to pin AA/1A
. pin 4 to pin AA/1B ASM 732508.

(1) If the fault continues:

Subtask 74-00-00-710-101-A ** ON A/C NOT FOR ALL

B. After the subsequent flight, make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:36:58 UTC