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4. Fault Isolation
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A. The fault message is generated when the ECU detects an open circuit or a short to ground on the solenoid of the HCU directional valve on channel B or on associated electrical 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 HCU (TRDV), J6, ECU:
- disconnect the harness from the connector B of the HCU and apply 28VDC between pin B/4 (+) and pin B/5 (-) on the HCU,
- make sure that the value of the current is between 350 and 630 mA.
(a) If the current is out of the specified limits:
- replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
(b) If the current is in the specified limits:
- on the overhead panel 50VU, push and release the P/BSW-ENG/FADEC GND PWR/2 (7KS2) the ON legend comes on,
- set the engine 2 throttle lever to the reverse thrust position,
- disconnect the harness J6 from the ECU then install a jumper wire between pins 4 and 5 on the thrust reverser harness J6 connector to the HCU,
- do a continuity check between pins 7 and 8 of the harness J6.
1 If there is no continuity:
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- remove the jumper wire from the harness pins 4 and 5,
- replace the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) (Ref. ASM 73-25/16).
a If the fault continues:
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- do a check of the thrust reverser harness including junction box and the aircraft wiring for open circuit (Ref. AMM TASK 78-31-42-210-041).
b If there is no continuity:
_ - repair or replace as required (Ref. ASM 73-25/16).
c If nothing is found:
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- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
2 If there is continuity:
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- remove the jumper wire from the harness pins 4 and 5,
- do a resistance check at the harness J6 connector to the ECU between: . pins 7 and 11 (>10 megohms) . pins 7 and 8 (>10 megohms) . pin 7 and the ground (>10 megohms).
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F 『 E C F M E E E E 56 E E E a If the resistance values are out of the specified limits:
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- repair or replace the thrust reverser harness (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049), or the aircraft wiring between the ECU and the HCU (Ref. ASM 73-25/16).
b If the resistance values are in the specified limits:
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- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(2) If the test does not give the maintenance message HCU (TRDV), J6, ECU:
- this indicates that the fault was intermittent and is no longer present,
- do a check of the thrust reverser harness connectors at the ECU, HCU and junction box for looseness, contamination or damaged pins,
- clean, retighten or replace harness as required (Ref. AMM TASK 78-31-42-210-041).
(a) If nothing is found:
- no additional action is required.
(b) If the fault becomes repetitive and is never confirmed during the operational test of the thrust reverser:
- replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
1 If the fault continues:
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- replace the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) (Ref. ASM 73-25/16).
2 If the fault continues:
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- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
3 If the fault continues:
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- replace the thrust reverser harness (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049).
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