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 f If there is 115VAC:
_
 - do a check for 28VDC at pin A/X of the relay base 3EG1.
 g If there is no 28VDC:
_
 - repair the wiring or replace the C/B-ENGINE/ENG1/OIL/PRESS (2EN1).
 h If there is 28VDC:
_
 - do a check for ground at pin A/X2 of the relay base 2EG1 and pin A/Z of the relay base 3EG1.
 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/1 (7KS1) the ON legend goes off,
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 - set the engine 1 throttle control lever to idle position,
 - do a check of the wiring continuity between the static
 relay (3EG1), the SEC1 (1CE1) and the SEC2 (1CE2).
 k_ If the wiring is correct:
 - make sure that there is no ground at pin AB/15E on the
 SEC1 (1CE1) and the SEC2 (1CE2) (Ref. ASM 78-37/01).
 - look for any FCDC or radio altimeter failure (on the 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-2
 (1CE2) (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 (4101KS1) (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 78-31-00-810-856
 Failure of the Thrust Reverser Hydraulic Isolation Valve in the Closed Position on Engine 2
 1. Possible Causes
_______________
 - STATIC RELAY-THRUST REVERSER LOCKING CTL, ENG2 (3EG2)

 - RELAY-THRUST REVERSER LOCKING POWER, ENG2 (2EG2)

 - VALVE-THRUST REVERSER HYDRAULIC ISOLATION, ENG2 (50EG2)

 - HCU-THRUST REV (4101KS)

 - C/B-SAFETY CIRCUIT BREAKER OPEN (1EG2)

 - C/B-ENGINE/ENG2/OIL/PRESS (2EN2)

 - SEC-1 (1CE1)

 - SEC-3 (1CE3)

 - HCU pressure switch (4102KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 27-94-34-000-001 Removal of the SEC (1CE1,1CE2,1CE3)
 AMM 27-94-34-400-001 Installation of the SEC (1CE1,1CE2,1CE3)
 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 AMM 78-37-51-000-001 Removal of the Thrust Reverser Hydraulic Isolation
 Valve
 AMM 78-37-51-400-001 Installation of the Thrust Reverser Hydraulic

 Isolation Valve
 ASM 78-37/01
 AWM 78-36-03

 3. Fault Confirmation
__________________
 A. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU ENG2/REV/LOCK 1EG2 N45 121VU ENGINE/ENG2/OIL/PRESS 2EN2 N42
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