(b) If the fault continues:
- replace the CTL UNIT-THROTTLE, ENG 1 (8KS1) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
(c) If the fault continues:
- 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:
R - do a check for a short to ground between (Ref. ASM 73-25/16): .the EIU1 (1KS1) pin AA/4C and the TCU1 (8KS1) pin E/C .the EIU1 (1KS1) pin AA/4A and the TCU1 (8KS1) pin E/C .the relay (14KS1) and its related wiring.
1 If nothing is found:
_
- replace the thrust reverser harness (Ref. AMM TASK 71-51-43-000-044) and (Ref. AMM TASK 71-51-43-400-044).
B. Do the test given in Para. 3.
(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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Failure of the Thrust Reverser Inhibition Switch - Engine 2 - Channel A
1. Possible Causes
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- CTL UNIT-THROTTLE, ENG 2 (8KS2)
- EIU-2 (1KS2)
- RELAY-THRUST REV INHIBITION, ENG 2 (14KS2)
- thrust reverser harness
- aircraft wiring
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-51-43-000-044 Removal of the Thrust Reverser (Channel A and B) Harness (4200KS) AMM 71-51-43-400-044 Installation of the Thrust Reverser (Channel A and B)
Harness (4200KS) 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 76-11-19-000-042 Removal of the Throttle Control Unit (8KS1, 8KS2) AMM 76-11-19-400-042 Installation of the Throttle Control Unit (8KS1,
8KS2) AMM 78-31-00-710-042 Operational Test of the Thrust Reverser System ASM 73-25/16 ASM 73-25/16 ASM 78-37/01
3. Fault Confirmation
__________________
A. Make sure that the throttle lever is not in the thrust reverser area.
B. Do the operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-042).
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4. Fault Isolation
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A. This fault message is generated when the ECU detects an unwanted closure of the inhibition relay 14KS2 or a short or short to ground in the harness J5 or in the thrust reverser harness or in the aircraft wiring.
CAUTION : MAKE SURE THAT THERE IS NO HYDRAULIC PRESSURE WHILE YOU DO THIS
_______ TEST. PUT A WARNING NOTICE IN THE COCKPIT TO TELL PERSONS NOT TO PRESSURIZE THE HYDRAULIC SYSTEMS.
(1) If the test gives the maintenance message J5, TR ACFT SW, ECU: - on the overhead panel 50VU, push and release the P/BSW-ENG/FADEC
GND PWR/2 (7KS2) the ON legend comes on, R
- remove the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) from 188VU and do a check for 28VDC at pin A/X on the relay base (Ref. ASM 73-25/16).
(a) If there is 28VDC: R
- disconnect the connector E from the TCU2 (8KS2) and do a check for ground at pin E/C.
1 If there is ground:
_
- replace the CTL UNIT-THROTTLE, ENG 2 (8KS2) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
2 If there is no ground:
_ - on the overhead panel 50VU, push the P/BSW-ENG/FADEC GND PWR/2 (7KS2) the ON legend goes off,
- remove the EIU2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and disconnect the connector E from the TCU2 (8KS2),
- do a check for a short to ground between (Ref. ASM 78-37/01): .the EIU2 (1KS2) pin AA/4C and the TCU2 (8KS2) pin E/C .the EIU2 (1KS2) pin AA/4A and the TCU2 (8KS2) pin E/C.
3 If there is a short to ground:
_ - repair as required.
4 If nothing is found:
_
- 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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