Thrust Reverser Unlocked on Engine 2

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1. Possible Causes
· heat source in the fan zone
· HCU-THRUST REV (4101KS)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 30-21-49-200-010 Detailed Visual Inspection of the Inlet Cowl Anti-Ice Supply Ducts and
Associated Hardware in the Core Compartment
Ref. AMM 30-21-49-790-010 Leak Test of the Inlet Cowl Anti-Ice Supply Ducts with the Engine in
Operation
Ref. AMM 73-22-49-220-040 Purge the Burner Pressure Sensor Tube
Ref. AMM 78-31-51-000-010 Removal of the Thrust Reverser Hydraulic Control Unit
Ref. AMM 78-31-51-200-010 General Check of the Hydraulic Control Unit (HCU) General Condition
and Filter Indicator, without component removal
Ref. AMM 78-31-51-400-010 Installation of the Thrust Reverser Hydraulic Control Unit
Ref. AMM 80-13-49-200-010 General Check of the Starter Duct
Ref. AMM 80-13-49-700-010 Leak Test of the Starter Ducts with the Engine in Operation
3. Fault Confirmation
Subtask 78-30-00-710-157-A
A. Test
Not applicable.
4. Fault Isolation
Subtask 78-30-00-810-119-A
A. If the fault symptom is identified by the ECAM warning ENG2 REVERSER UNLOCKED and ENG2 REV
PRESSURIZED:
(1) Check for signs of HCU overheat:
(a) examine the HCU for heat damage Ref. AMM 78-31-51-200-010 .
(b) make a record of any heat damage to the HCU.
(2) Make sure that there is no source of abnormal heat generation under the fan cowls:
(a) examine the under cowl area for evidence of fire.
(b) examine starter ducts for leaks Ref. AMM 80-13-49-200-010 .
(c) examine the thermal anti-ice ducts for leaks in the fan zone only Ref. AMM 30-21-49-200-010 .
(d) do a leak test of the starter duct Ref. AMM 80-13-49-700-010 .
(e) do a leak test of the thermal anti-ice ducts in the fan zone only Ref. AMM 30-21-49-790-010 .
(f) examine the Pb line for leaks Ref. AMM 73-22-49-220-040 .
(g) rectify any leak or heat source in the fan zone .
(3) Replace the HCU-THRUST REV (4101KS) Ref. AMM 78-31-51-000-010 and Ref.
AMM 78-31-51-400-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:09 UTC