- do a check of the connectors for looseness, bent pins, corrosion or contamination.
(a) If damage is found:
- clean, repair or replace as required (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002).
(b) If no damage is found and fault continues while maintenance message is never confirmed during the test:
- replace the PRESS SW-HCU (4102KS) (Ref. AMM TASK 78-31-16-000-040) and (Ref. AMM TASK 78-31-16-400-040).
(c) If the fault continues:
- repair or replace the defective harnesses J5 or J6 or thrust reverser harness (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002).
(d) 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).
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ECES F 『 E C F M E E E E 56 E E E B. Do the test given in Para. 3.A.
(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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TASK 78-31-00-810-878
Thrust Reverser HCU Pressure-Switch Failed Open on Engine 2
1. Possible Causes
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- PRESS SW-HCU (4102KS)
- harness J5
- harness J6
- thrust reverser harness
- junction box
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-51-44-000-002 Removal of the Thrust Reverser Harness 238W0908 AMM 71-51-44-400-002 Installation of the Thrust Reverser Harness 238W09098 AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit
(ECU)(4000KS) AMM 78-31-00-710-040 Operational Test of the Thrust Reverser System AMM 78-31-16-000-040 Removal of the Hydraulic Control Unit Pressure Switch
(4102KS) AMM 78-31-16-400-040 Installation of the Hydraulic Control Unit Pressure Switch (4102KS) ASM 73-25/16
3. Fault Confirmation
__________________
A. Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-040).
4. Fault Isolation
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A. This fault message is generated if there is an HCU pressure switch failed in the open position.
(1) If the test gives the maintenance message TR PR SW, J5+J6, ECU:
- get access to the HCU,
- disconnect the harnesses J5 and J6 from the HCU pressure switch (4102KS),
- install jumper wires between pins 2 and 3 on the harness J5 connector and between pins 4 and 5 on the harness J6 connector,
- disconnect the harnesses J5 and J6 from the ECU (4000KS) and do a resistance check at each harness connector to the ECU (Ref. ASM 73-25/16) between:
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. pins 12 and 13 (<5 ohms)
. pins 12 and 11 (>10 megohms)
. pin 12 and the ground (>10 megohms).
(a) If the resistance values are in the specified limits:
- replace the PRESS SW-HCU (4102KS) (Ref. AMM TASK 78-31-16-000-040) and (Ref. AMM TASK 78-31-16-400-040).
(b) If the resistance values are out of the specified limits:
- do a continuity and insulation check of the harnesses between the ECU and the HCU pressure switch,
- repair or replace the defective harness J5 or harness J6 or thrust reverser harness or junction box (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002).
(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).
(2) If the test does not give the maintenance message TR PR SW, J5+J6, ECU; this is indicative of an intermittent fault that may be caused by defective electrical contacts in the harnesses and junction box between the ECU and the HCU:
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