Thrust Reverser remaining fully stowed when commanded to deploy on ENG1

TASK 78-31-00-810-875-A
Thrust Reverser remaining fully stowed when commanded to deploy on ENG1

1. Possible Causes

TR hydraulic tubes
blocker door latches
blocker door actuator
electrical harness
ECU [4000KS]
HCU (4101KS)

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 78-31-00-710-040	Operational Test of the Thrust Reverser System
AMM 78-31-00-710-042	Operational Test of the Thrust Reverser System
AMM 78-31-19-210-041	General Visual Inspection of Blocker Door Latches, Hinges and Adjacent Structure (Blocker Doors Deployed)
AMM 78-31-41-210-042	Detailed Inspection of Actuator Rod End Attachments (Blocker Doors Deployed)
AMM 78-31-42-210-040	Detailed Visual Inspection of the Electrical Harness
AMM 78-31-42-210-041	Detailed Visual Inspection of the electrical Harness
AMM 78-31-49-210-002	General Visual Inspection of Hydraulic Tubing and Hoses (Blocker Doors Deployed)
AMM 78-31-51-000-040	Removal of the Hydraulic Control Unit
AMM 78-31-51-000-042	Removal of the Hydraulic Control Unit
AMM 78-31-51-400-040	Installation of the Hydraulic Control Unit
AMM 78-31-51-400-042	Installation of the Hydraulic Control Unit
AMM 78-32-41-860-001	Manual Deployment of the Blocker Door
AMM 78-32-41-860-040	Manual Deployment of the Blocker Door

3. Fault Confirmation
Subtask 78-31-00-710-192-A ** ON A/C NOT FOR ALL

A. Test
(1) Do an operational test of the Thrust Reverser system AMM 78-31-00-710-040.

Subtask 78-31-00-710-192-B ** ON A/C NOT FOR ALL

A. Test
(1) Do an operational test of the Thrust Reverser system AMM 78-31-00-710-042.

4. Fault Isolation
Subtask 78-31-00-810-134-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message TR LOCK, TR ACT:

Do a general visual inspection of the TR hydraulic tubes AMM 78-31-49-210-002

(1) If damage is found:

repair or replace as necessary.

(2) If mothing is found:

Perform a manual deployment of the blocker door AMM 78-32-41-860-040
Do a general visual inspection of the blocker door latches , hinges and adjacent structure AMM 78-31-19-210-041.

(a) If damage is found:

repair or replace as necessary.

(b) If nothing is found:

Do a general visual inspection of blocker door actuator rod end attachments AMM 78-31-41-210-042

1 If damaged is found:

repair or replace as necessary.

2 if nothing is found:

Do a detailed visual inspection of the electrical harness AMM 78-31-42-210-040

a If damage is found:

repair or replace as necessary.

b if nothing is found:

replace the ECU [4000KS] AMM 73-21-60-000-001 AMM 73-21-60-400-001
* If the fault continues, replace the HCU (4101KS) AMM 78-31-51-000-040 AMM 78-31-51-400-040.

Subtask 78-31-00-810-134-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message EIU, HCU:

NOTE: If the Thrust Reverser remains fully stowed when commanded to deploy, the ECU triggers the "EIU, HCU" maintenance message instead of "TR LOCK, TR ACT" (due to 2 fault parameters inverted into the ECU software) carry out the following TSM procedure without take into account the components highlighted into the maintenance message.

Do a general visual inspection of the TR hydraulic tubes AMM 78-31-49-210-002