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 TASK 78-31-00-810-815
 Failure of the Control of the Thrust-Reverser HCU Directional-Valve through the two Channels on Engine 1
 1. Possible Causes
_______________
 - RELAY-THRUST REV INHIBITION, ENG 1 (14KS1)

 - EIU-1 (1KS1)

 - CTL UNIT-THROTTLE, ENG 1 (8KS1)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
78-31-00-810-817 Failure of the Control of the Thrust-Reverser HCU Directional-Valve through the Channel A on Engine 1 78-31-00-810-818 Failure of the Control of the Thrust-Reverser HCU
 Directional-Valve through the Channel B on Engine 1 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

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-042).
 4. Fault Isolation
_______________
 A. The fault message is generated when the ECU detects an open circuit or a short to ground on both solenoids of the HCU directional valve on channel A and channel B or on associated electrical wiring. Most probable cause is an inhibition relay (14KS1) failure or of its control.
 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.
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 (1) If the test gives the maintenance message DIR VLV, J5, ECU then DIR VLV, J6, ECU:
 - remove the RELAY-THRUST REV INHIBITION, ENG 1 (14KS1) from its base on 187VU,

 - on the overhead panel 50VU, push and release the P/BSW-ENG/FADEC GND PWR/1 (7KS1) the ON legend comes on,

 - set the engine 1 throttle lever to the reverse thrust position,

 - do a check for 28VDC at pin A/X of the relay base.

 (a) If there is 28VDC:
 - make sure that ground is present at pin A/Z of the relay base.
 1 If there is no ground:
_ - repair the wiring (Ref. ASM 73-25/16).
 2 If there is ground:
_
 - replace the RELAY-THRUST REV INHIBITION, ENG 1 (14KS1) (Ref. ASM 73-25/16).
 3 If the fault continues:
_
 - do the trouble shooting for each maintenance message DIR VLV, J5, ECU (Ref. TASK 78-31-00-810-817) then DIR VLV, J6, ECU (Ref. TASK 78-31-00-810-818).
 (b) If there is no 28VDC:
 - set the throttle levers to forward idle position,

 - on the overhead panel 50VU, push the P/BSW-ENG/FADEC GND PWR/1 (7KS1) the ON legend goes off,

 - remove the EIU1 (1KS1) (Ref. AMM TASK 73-25-34-000-040),

 - do a continuity and an insulation check of the wiring between pin A/X of the relay base 14KS1 and pin AA/10A of the EIU1 (1KS1) (Ref. ASM 73-25/16).

 1 If there is an open circuit or a short to ground:
_ - repair the wiring.
 2 If nothing is found :
_
 - do a continuity check (insulation check not required) of the wiring (Ref. ASM 73-25/16) between: . 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.
 a If there is an open circuit:
_ - repair the associated wiring.
 b If nothing is found:
_
 - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
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