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 Loss of Data on the Second and Primary ECS Buses to the EIU 2
 1. Possible Causes
_______________
 - CONT-ZONE TEMPERATURE (8HK)

 - EIU-2 (1KS2)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 21-63-34-000-001 Removal of the Zone Controller (8HK)
 AMM 21-63-34-400-001 Installation of the Zone Controller (8HK)
 AMM 73-25-34-000-040 Removal of the Engine Interface Unit (EIU)

 (1KS1,1KS2) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU) (1KS1,1KS2) AWM 73-25-20
 3. Fault Confirmation
__________________
 A. Test
 (1) Not applicable.
 4. Fault Isolation
_______________
 A. If the fault is also present on engine 2:
 - replace the CONT-ZONE TEMPERATURE (8HK) (Ref. AMM TASK 21-63-34-000-001) and (Ref. AMM TASK 21-63-34-400-001).
 (1) If the fault is present on engine 2 only:
 - do a check of the wiring between the EIU2 (1KS2) pins AA/2J, AA/2K and terminal block 1853VT and between the EIU2 (1KS2) pins AA/3J, AA/3K and terminal block 1862VT (Ref. AWM 73-25-20).
 (a) If the wiring is not correct:

 - Repair as required.

 (b) If the wiring is correct:

 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
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 B. No additional maintenance action is required if the fault is not confirmed.
 (1) Repeat the fault isolation procedure if the fault continues.
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ECES  TASK 73-25-00-810-879

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 Loss of FCU Data on the EIU 1
 1. Possible Causes
_______________
 - EIU-1 (1KS1)

 - wiring from the EIU-1 (1KS1) pins AA/1J, 1K to the first terminal block

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-25-34-000-040 Removal of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU)
 (1KS1,1KS2) AMM 73-25-34-710-043 Operational Test of the Engine Interface Unit ASM 73-25/06
 3. Fault Confirmation
__________________
 A. Test Do the operational test of the engine interface unit through the CFDS (Ref. AMM TASK 73-25-34-710-043).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message EIU 1 : NO FCU DATA:
 - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 (1) If the fault continues:
 - do a check and repair the wiring from the EIU-1 (1KS1) pins AA/1J, 1K to the first terminal block (Ref. ASM 73-25/06).
 B. Do the test given in Para. 3.A.
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 Loss of FCU Data on the EIU 2
 1. Possible Causes
_______________
 - EIU-2 (1KS2)

 - wiring from the EIU-2 (1KS2) pins AA/1J, 1K to the first terminal block

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-25-34-000-040 Removal of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU)
　
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