B. Test
(1) Do the operational test of the thrust reverser system (2A and 2B) (MENU mode test) (Ref. AMM TASK 78-31-00-710-042). Make sure that the hydraulic pressure is correct during the test. The pressure must not drop below the advisory threshold.
4. Fault Isolation
_______________
A. This fault message is generated if the ECU detects no pressurization of the thrust reverser HCU after a deploy command of the thrust reverser. This indicates either a thrust reverser isolation valve failure to open or a HCU failure. The ECU cannot determine which one of the two items of equipment has failed as the thrust reverser isolation valve and the HCU are installed in series, while the ECU uses the HCU pressure switch for monitoring (Ref. ASM 78-37/01).
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 does not give the maintenance message HCU, TRSOV, HYD but the fault message is shown again on the subsequent flights:
- replace the STATIC RELAY-THRUST REVERSER LOCKING CTL, ENG2 (3EG2).
(a) If the fault continues:
- replace the RELAY-THRUST REVERSER LOCKING POWER, ENG2 (2EG2).
(2) If the test gives the maintenance message HCU, TRSOV, HYD or the thrust reverser blocker doors do not deploy normally or stow during the test:
- replace the STATIC RELAY-THRUST REVERSER LOCKING CTL, ENG2 (3EG2).
(a) If the fault continues:
- replace the RELAY-THRUST REVERSER LOCKING POWER, ENG2 (2EG2).
(b) If the fault continues:
- make sure that you have correctly exited the FADEC menu mode,
- disconnect the electrical connector from the thrust reverser isolation valve (50EG2),
- 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 control lever to the reverse position. Make sure that the throttle control lever of the opposite engine is in the idle position,
- do a check for ground at pin A/2 of the thrust reverser isolation valve (50EG2).
1 If there is no ground:
_
- repair the wiring or the ground terminal 480VN2 (Ref. AWM 78-36-03).
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If there is ground:
- do a check for 115VAC between pins 1 and 2 of the connector on the harness side.
a_ If there is 115VAC:
- replace the VALVE-THRUST REVERSER HYDRAULIC ISOLATION,
ENG2 (50EG2) (Ref. AMM TASK 78-37-51-000-001) and (Ref.
AMM TASK 78-37-51-400-001).
If the fault continues:
- 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 there is no 115VAC:
_ - on the overhead panel 50VU, push the P/BSW-ENG/FADEC GND PWR/2 (7KS2) the ON legend goes off,
- do a continuity check of the electrical wiring between the thrust reverser isolation valve (50EG2) pin A/1 and the power relay 2EG2 pin A/A2.
c If the wiring is not correct:
_ - repair as required.
d If the wiring is correct:
_
- remove the static relay (3EG2) and the power relay (2EG2) from their base on 120VU.
- on the overhead panel 50VU, push and release the P/BSW-ENG/FADEC GND PWR/2 (7KS2) the ON legend comes on,
- with the engine 2 throttle control lever still in reverser position, do a check for 115VAC at pin A/B1 of the relay base 2EG2.
e If there is no 115VAC:
_
- repair the wiring or replace the C/B-SAFETY CIRCUIT BREAKER OPEN (1EG2).
f If there is 115VAC:
_
- do a check for 28VDC at pin A/X of the relay base 3EG2.
g If there is no 28VDC:
_
- repair the wiring or replace the C/B-ENGINE/ENG2/OIL/PRESS (2EN2).
h If there is 28VDC:
_
- do a check for ground at pin A/X2 at the relay base 2EG2 and pin A/Z of the relay base 3EG2.
i If there is no ground:
_ - repair the wiring.
j If there is ground:
_ - on the overhead panel 50VU, push the P/BSW-ENG/FADEC GND PWR/2 (7KS2) the ON legend goes off,
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