DOC AIRBUS | AMM A320FInstallation of the Left Thrust Reverser Blocker Door Bumpers [IAE]
TASK 78-32-45-400-803-A
Installation of the Left Thrust Reverser Blocker Door Bumpers
1. Reason for the Job
This task supplies the data to install the five thrust reverser blocker door bumpers. The upper bumper uses a wedge to support the bumper assembly, the four lower bumpers use a filler in place of the wedge.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 78-32-45-860-056-A ** ON A/C NOT FOR ALL
Subtask 78-32-45-420-053-A ** ON A/C NOT FOR ALL
(a) Pre-clean faying surfaces of the metal using a lint free cloth (Material No.V02-099) dampened withV01-031 Acetone, Technical grade
(b) Lightly abrade the pre-cleaned surface using ABRASIVE PAPER -120 GRIT or aluminium oxyde abrasive nylon web.
(c) Final-clean with a lint free cloth (Material No.V02-099) dampened withV01-031 Acetone, Technical grade
(2) Install the filler (2) or the wedge (3) to the bond panel.
(a) Use DAPCO 2100 Primerless Sealant or DAPCO 2200 Rapid Cure Primerless Sealant according to the manufacturer's instructions to install the filler (2) or wedge (3) to the bond panel.
(3) Pre-clean the bumper assembly as follows:
(a) Scuff sand the faying surface of the rubber absorber with ABRASIVE PAPER -120 GRIT.
(b) Remove all the sanding debris using a lint free cloth (Material No.V02-099) dampened withV01-124 Isopropyl Alcohol, Technical grade
(4) Install the bumper assembly (1) on the filler (2) or on the wedge (3).
(a) Use primer (Material No.V08-032) for silicone rubber compound (Material No.V08-031) or General Electric SS4004 primer for RTV 108 according to the manufacturer's instructions to install the bumper assembly (1) on the filler (2) or on the wedge (3).
(b) Install the bumper assembly (1) over the filler (2) or the wedge (3) with the laminated shim towards the blocker door.
Subtask 78-32-45-820-050-A ** ON A/C NOT FOR ALL
Subtask 78-32-45-860-058-A ** ON A/C NOT FOR ALL Subtask 78-32-45-410-065-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:12:38 UTC
Installation of the Left Thrust Reverser Blocker Door Bumpers
1. Reason for the Job
This task supplies the data to install the five thrust reverser blocker door bumpers. The upper bumper uses a wedge to support the bumper assembly, the four lower bumpers use a filler in place of the wedge.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ABRASIVE PAPER -120 GRIT |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-031) | Acetone, Technical grade |
| (Material No.V01-124) | Isopropyl Alcohol, Technical grade |
| (Material No.V02-099) | lint free cloth |
| (Material No.V08-031) | silicone rubber compound |
| (Material No.V08-032) | primer |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-31-00-710-041-A | Operational Test of the Thrust Reverser System with the CFDS |
| TASK 78-31-00-710-041-A-02 | Operational test of the Thrust Reverser without the CFDS and Engine Running |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
| TASK 78-32-00-410-010-A | Closing of the Thrust Reverser Halves |
| TASK 78-32-00-860-010-A | Manual Extension of the Thrust Reverser Translating Sleeves |
| TASK 78-32-00-860-011-A | Manual Retraction of the Thrust Reverser Translating Sleeves |
| TASK 78-32-45-400-010-A | Installation of the Left Thrust Reverser Blocker Doors |
Left Thrust Reverser Blocker Door BumpersSubtask 78-32-45-860-056-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
Subtask 78-32-45-010-071-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 78-32-45-040-060-A ** ON A/C NOT FOR ALL (1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
C. Make sure that the thrust reverser is deactivated:
Subtask 78-32-45-860-057-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(1) Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated (Ref. AMM TASK 78-30-00-040-012). D. Make sure that the thrust reverser translating sleeves are extended 3 in. (76.2 mm) to 4 in. (101.6 mm) (Ref. AMM TASK 78-32-00-860-010).
4. ProcedureSubtask 78-32-45-420-053-A ** ON A/C NOT FOR ALL
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
A. Installation of the Left Thrust Reverser Blocker Door Bumpers NOTE: Parts may be sized using removed parts as template.
(1) Pre-clean faying surfaces of the filler (2) or wedge (3) as follows: (a) Pre-clean faying surfaces of the metal using a lint free cloth (Material No.V02-099) dampened with
(b) Lightly abrade the pre-cleaned surface using ABRASIVE PAPER -120 GRIT or aluminium oxyde abrasive nylon web.
(c) Final-clean with a lint free cloth (Material No.V02-099) dampened with
(2) Install the filler (2) or the wedge (3) to the bond panel.
(a) Use DAPCO 2100 Primerless Sealant or DAPCO 2200 Rapid Cure Primerless Sealant according to the manufacturer's instructions to install the filler (2) or wedge (3) to the bond panel.
(3) Pre-clean the bumper assembly as follows:
(a) Scuff sand the faying surface of the rubber absorber with ABRASIVE PAPER -120 GRIT.
(b) Remove all the sanding debris using a lint free cloth (Material No.V02-099) dampened with
(4) Install the bumper assembly (1) on the filler (2) or on the wedge (3).
(a) Use primer (Material No.V08-032) for silicone rubber compound (Material No.V08-031) or General Electric SS4004 primer for RTV 108 according to the manufacturer's instructions to install the bumper assembly (1) on the filler (2) or on the wedge (3).
(b) Install the bumper assembly (1) over the filler (2) or the wedge (3) with the laminated shim towards the blocker door.
B. Adjust the Aero Smoothness
(1) Remove the peelable laminated shim on the bumper assembly (1), to adjust the aero smoothness at the trailing edge of the blocker door to adjacent bond panel.
(2) Make sure to keep the acceptable tolerance between +0.050 in. (1.27 mm) to the wind step and -0.050 in. (-1.27 mm) out of the wind step. See the sheet 1 of the figure.
Subtask 78-32-45-420-054-A ** ON A/C NOT FOR ALL (1) Remove the peelable laminated shim on the bumper assembly (1), to adjust the aero smoothness at the trailing edge of the blocker door to adjacent bond panel.
(2) Make sure to keep the acceptable tolerance between +0.050 in. (1.27 mm) to the wind step and -0.050 in. (-1.27 mm) out of the wind step. See the sheet 1 of the figure.
C. Installation of the Thrust Reverser Blocker Doors
(1) Install the thrust reverser blocker doors (Ref. AMM TASK 78-32-45-400-010).
5. Close-up(1) Install the thrust reverser blocker doors (Ref. AMM TASK 78-32-45-400-010).
Subtask 78-32-45-860-058-A ** ON A/C NOT FOR ALL Subtask 78-32-45-410-065-A ** ON A/C NOT FOR ALL
B. Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 78-32-45-440-056-A ** ON A/C NOT FOR ALL Subtask 78-32-45-410-066-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).
Subtask 78-32-45-710-051-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).
E. Operational Test
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).
NOTE: As an alternative procedure, you can do the operational test without the CFDS (Ref. AMM TASK 78-31-00-710-041).