DOC AIRBUS | TSM A320FPartial deployment of the Thrust Reverser when commanded to deploy on ENG2
TASK 78-31-00-810-872-A
Partial deployment of the Thrust Reverser when commanded to deploy on ENG2
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 78-31-00-710-190-A ** ON A/C NOT FOR ALL Subtask 78-31-00-710-190-B ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 78-31-00-810-133-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:38:05 UTC
Partial deployment of the Thrust Reverser when commanded to deploy on ENG2
1. Possible Causes
- TR hydraulic tubes
- blocker door actuator
- stow-switches
- electrical harness
- EIU
HCU (4101KS) - ECU [4000KS]
- SW-BLOCKER DOOR DEPLOY, L [4103KS1]
- SW-BLOCKER DOOR DEPLOY, R [4103KS2]
ECU (4000KS)
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 73-25-34-000-040 | Removal of the Engine Interface Unit (EIU) |
| AMM 73-25-34-400-040 | Installation of the Engine Interface Unit (EIU) |
| 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 78-31-17-000-040 | Removal of the Blocker Door Deploy Switch |
| AMM 78-31-17-210-001 | Detailed Visual Inspection of the Deploy Switches and Triggers |
| AMM 78-31-17-400-040 | Installation of the Blocker Door Deploy Switch |
| AMM 78-31-18-210-001 | Detailed Visual Inspection of the Stow-switches (4104ks1,4104ks2,4104ks3,4104ks4) |
| AMM 78-31-18-210-040 | Detailed Visual Inspection of the Stow-switches |
| 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 |
Subtask 78-31-00-710-190-A ** ON A/C NOT FOR ALL Subtask 78-31-00-710-190-B ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 78-31-00-810-133-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message EIU, HCU:
Subtask 78-31-00-810-133-B ** ON A/C NOT FOR ALL - Do a general visual inspection of the TR hydraulic tubes AMM 78-31-49-210-002.
- repair or replace as necessary.
- Perform a manual deployment of the blocker door AMM 78-32-41-860-040.
- Do a general visual inspection of blocker door actuator rod end attachments AMM 78-31-41-210-042.
- repair or replace as necessary.
- Do a detailed visual inspection of the stow-switches AMM 78-31-18-210-040.
- repair or replace as necessary.
- Do a detailed visual inspection of the electrical harness AMM 78-31-42-210-040.
- repair or replace as necessary.
- Replace the EIU AMM 73-25-34-000-040 AMM 73-25-34-400-040.
* If the fault continues, replace theHCU (4101KS) AMM 78-31-51-000-040 AMM 78-31-51-400-040.
** If the fault continues, replace the ECU [4000KS] AMM 73-21-60-000-001 AMM 73-21-60-400-001.
A. If the test gives the maintenance message TR LOCK, TR ACT:
PRE SB 73-1100
Subtask 78-31-00-810-284-A ** ON A/C NOT FOR ALL PRE SB 73-1100
NOTE: If the Thrust Reverser is partially open when commanded to deploy, the ECU triggers the "TR LOCK, TR ACT" maintenance message instead of "EIU, HCU" (due to 2 fault parameters 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
- repair or replace as necessary.
- Perform a manual deployment of the blocker door AMM 78-32-41-860-001
- Do a general visual inspection of blocker door actuator rod end attachments AMM 78-31-41-210-042
- repair or replace as necessary.
- Do a detailed visual inspection of the stow-switches AMM 78-31-18-210-001.
- repair or replace as necessary.
- Do a detailed visual inspection of the electrical harness AMM 78-31-42-210-041
- repair or replace as necessary.
- Replace the EIU AMM 73-25-34-000-040 AMM 73-25-34-400-040.
* If the fault continues, replace theHCU (4101KS) AMM 78-31-51-000-042 AMM 78-31-51-400-042.
** If the fault continues, replace the ECU [4000KS] AMM 73-21-60-000-001 AMM 73-21-60-400-001
END OF PRE SB 73-1100
B. If the test gives the maintenance message TR LOCK, TR ACT DPLSW:
POST SB 73-1100 (FADEC 5BS2)
Subtask 78-31-00-710-191-A ** ON A/C NOT FOR ALL POST SB 73-1100 (FADEC 5BS2)
- Do a general visual inspection of the TR hydraulic tubes AMM 78-31-49-210-002.
- repair or replace as necessary.
- Perform a manual deployment of the blocker door AMM 78-32-41-860-001
- Do a general visual inspection of blocker door actuator rod end attachments AMM 78-31-41-210-042.
- repair or replace as necessary.
- Do a detailed visual inspection of the stow-switches AMM 78-31-18-210-001.
- repair or replace as necessary.
- Inspect the deploy switches levers AMM 78-31-17-210-001.
*If the finding do not indicate mechanical problem, replace the defective: - SW-BLOCKER DOOR DEPLOY, L [4103KS1] or/and
- SW-BLOCKER DOOR DEPLOY, R [4103KS2] AMM 78-31-17-000-040 AMM 78-31-17-400-040.
** If nothing is found: - Do a detailed visual inspection of the electrical harness AMM 78-31-42-210-041.
- repair or replace as necessary.
- Replace the EIU AMM 73-25-34-000-040 AMM 73-25-34-400-040.
* If the fault continues, replace theHCU (4101KS) AMM 78-31-51-000-042 AMM 78-31-51-400-042.
** If the fault continues, replace theECU (4000KS) AMM 73-21-60-000-001 AMM 73-21-60-400-001.
END OF POST SB 73-1100
C. Do the test given in Para. 3.A.