- Relay (27KS2)

 2. Job Set-up Information
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 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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)
 ASM 73-25/08
 ASM 73-25/23

 3. Fault Confirmation
__________________
 A. Test
 NOTE : The landing gear must be correctly compressed without any tools or
____
 maintenance action.

 - On the overhead panel 50VU, push the FADEC GND PWR 2 pushbutton switch.

 - Put the throttle control levers in the idle position.

 - On the left or right MCDU, get access to the ENGINE MAIN MENU screen.

 - On the MCDU, push the line key (4R) adjacent to the applicable Specific tests indication.

 - push the line key (5L) adjacent to the SEC RELAY STATUS:

 (1) If MCDU screen indicates SEC RELAY CLOSED, the failure is not confirmed.

 - No further action is required

 (2) If MCDU screen indicates SEC RELAY OPEN, the failure is confirmed.

 - Do the step 4. Fault Isolation
 4. Fault Isolation
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 A. If MCDU screen indicates SEC RELAY OPEN:
 - On the left or right MCDU, get access to the ENGINE MAIN MENU screen.

 - On the MCDU, push the line key (4R) adjacent to the applicable Specific tests indication.

 - Push the line key (2L) adjacent to the ECU RELAY 1+2 CTRL:

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 (1) If fault light located on the Engine Panel Unit (115VU) is illuminated:

 - Replace the Relay (28KS2).
 (a) If the fault continues:
 - Remove the EIU

 - Do a check for a ground signal at pin E2 of the EIU rack-connector AA:

 1 If there is a ground signal:
_

 - replace the EIU (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 2 If there is no ground signal:
_

 - Repair the wiring between EIU connector AA and 28KS2 (Ref. ASM 73-25/08)
 (2) If fault light located on the Engine Panel Unit (115VU) is not illuminated:
 - Replace the Relay (27KS2).
 (a) If the fault continues:

 - Replace the Relay (28KS2).

 (b) If the fault continues:

 - Remove the EIU

 - Do a check for a ground signal at pin E2 of the EIU rack-connector AA:

 1 If there is a ground signal:
_

 - replace the EIU (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 2 If there is no ground signal:
_

 - Remove the 28KS2

 - Do a check for a ground signal: . at pin C of the 28KS2 connector A: . at pin Z of the 28KS2 connector A:

 a If there is no ground signal:
_ - repair the wiring as required

 b If there is a ground signal:
_

 - Do a check of continuity between pin 6 of 28KS2 connector A and pin E2 of the EIU rack-connector AA:
 * If there is no continuity:
 - repair the wiring between EIU and 28KS2 (Ref. ASM 73-25/23)
 * If there is continuity:
 - remove 27KS2
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 - do a check for a 28V at pin X of the 27KS2 connector A: ** If there is 28V:

 - repair the wiring between SEC1/2 and 27KS2 (Ref. ASM 73-25/23)

 ** If there is not 28V:

 - repair the wiring as required (Ref. ASM 73-25/23)

 B. Do the test given in Para. 3.A.
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 Spurious TCMA Arming on Engine 1
 1. Possible Causes
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 - Relay (28KS1)
　
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 發動機燃油和控制 2(2)