- set the engine 2 throttle control lever to idle position,
 - do a check of the wiring continuity between the static
 relay (3EG2), the SEC1 (1CE1) and the SEC3 (1CE3).
 k_ If the wiring is correct:
 - make sure that there is no ground at pin AE/15F on the
 SEC1 (1CE1) and the SEC3 (1CE3) (Ref. ASM 78-37/01).
 - look for any FCDC or radio altimeter failure (Chek Post
 Flight Report (PFR)) causing SEC output malfunction (TSM
 chapter 27).
 l_ If no external failure to the SECs is found:
 - replace successively the SEC-1 (1CE1) then the SEC-3
 (1CE3) (Ref. AMM TASK 27-94-34-000-001) and (Ref. AMM
 TASK 27-94-34-400-001).

 (3) If thrust reverser operation (deploy and stow) was normal during aircraft operation and during the test but the test gives the maintenance message HCU, TRSOV, HYD or HCU (TRPV), HYD:
 - replace the HCU pressure switch (4102KS) (Ref. AMM TASK 78-31-16-000-041) and (Ref. AMM TASK 78-31-16-400-041).
 (a) If the fault continues:
 - replace the HCU (4101KS2) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
 B. Do the test given in Para. 3.B.
 (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 78-31-00-810-857
 Failure of the HCU Pressurizing Valve on the Engine 1
 1. Possible Causes
_______________
 - PRESS SW-HCU (4102KS)

 - HCU-THRUST REV (4101KS)

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
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 78-31-00-710-042 Operational Test of the Thrust Reverser System
 AMM 78-31-16-000-041 Removal of the Hydraulic Control Unit Pressure Switch

 (4102KS) AMM 78-31-16-400-041 Installation of the Hydraulic Control Unit Pressure
 Switch (4102KS)
 AMM 78-31-51-000-042 Removal of the Hydraulic Control Unit
 AMM 78-31-51-400-042 Installation of the Hydraulic Control Unit

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the thrust reverser system (MENU mode test) (Ref. AMM TASK 78-31-00-710-042).
 4. Fault Isolation
_______________
 A. The fault message is generated if a position fault is detected on the HCU pressurizing valve (valve detected open when reverse stowage is commanded). The HCU pressurizing valve position monitoring is based upon the output signal of the HCU pressure switch. The warning ENG 1 REV PRESSURIZED is generated only if the fault has persisted for more than 10 seconds:
 - switch closed = no pressure,

 - switch opened = valve pressurized.

 (1) If the test gives the maintenance message HCU (TRPV), OPEN and the thrust reverser blocker doors deploy and stow normally:
 - replace the PRESS SW-HCU (4102KS) (Ref. AMM TASK 78-31-16-000-041) and (Ref. AMM TASK 78-31-16-400-041).
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 E 56 E E E (a) 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 gives the maintenance message HCU (TRPV), OPEN and the thrust reverser blocker doors do not deploy or stow normally:

 - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
 (a) 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).

 (3) If the test does not give the maintenance message HCU (TPRV), OPEN:

 - replace the HCU (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
　
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