DOC AIRBUS | AMM A320FInstallation of the AFT Cascade Support Ring [IAE]
TASK 78-32-81-400-010-A
Installation of the AFT Cascade Support Ring
1. Reason for the Job
This task supplies the data to install the Aft Cascade Support Ring.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 78-32-81-860-050-A ** ON A/C NOT FOR ALL
Subtask 78-32-81-420-050-A ** ON A/C NOT FOR ALL
Subtask 78-32-81-420-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:29:55 UTC
Installation of the AFT Cascade Support Ring
1. Reason for the Job
This task supplies the data to install the Aft Cascade Support Ring.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-23-11-911-013-A | General Torque Tightening Techniques |
| 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 78-32-19-400-010-A | Installation of the Thrust Reverser Deflector Boxes |
| TASK 78-32-43-400-010-A | Installation of the C-Duct Locking Actuator |
| TASK 78-32-46-400-010-A | Installation of the Left Translating Cowl |
| TASK 78-32-48-400-010-A | Installation of the C-Duct Non-Locking Actuator |
| TASK 78-32-76-400-010-A | Installation of the Right Translating Cowl |
AFT Support RingSubtask 78-32-81-860-050-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, 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, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
Subtask 78-32-81-010-054-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, 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, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-010)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 78-32-81-040-051-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
C. Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated (Ref. AMM TASK 78-30-00-040-012).
4. ProcedureSubtask 78-32-81-420-050-A ** ON A/C NOT FOR ALL
A. Install the Aft Cascade Support Ring
(1) Install the Aft Cascade Support Ring (1) on the C-Duct fixed structure.
(2) Attach the upper end of the Aft cascade support ring (1) with bolt (2), washer (3), bushings (4) and (5), washer (6) and nut (7).
(3) Attach the lower end of the Aft cascade support ring (1) with bolt (13), washer (12), bushings (11) and (10), washer (9) and nut (8).
(4) TORQUE nut (7) to between 190 and 160 lbf.in (2.15 and 1.81 m.daN )
(Ref. AMM TASK 70-23-11-911-013).
(5) TORQUE nut (8) to between 140 and 100 lbf.in (1.58 and 1.13 m.daN ) (Ref. AMM TASK 70-23-11-911-013).
5. Close-up(1) Install the Aft Cascade Support Ring (1) on the C-Duct fixed structure.
(2) Attach the upper end of the Aft cascade support ring (1) with bolt (2), washer (3), bushings (4) and (5), washer (6) and nut (7).
(3) Attach the lower end of the Aft cascade support ring (1) with bolt (13), washer (12), bushings (11) and (10), washer (9) and nut (8).
(4) TORQUE nut (7) to between 190 and 160 lbf.in (2.15 and 1.81 m.daN )
(Ref. AMM TASK 70-23-11-911-013). (5) TORQUE nut (8) to between 140 and 100 lbf.in (1.58 and 1.13 m.daN )
(Ref. AMM TASK 70-23-11-911-013). Subtask 78-32-81-420-051-A ** ON A/C NOT FOR ALL
A. Install the Thrust Reverser Actuators (Ref. AMM TASK 78-32-43-400-010) and (Ref. AMM TASK 78-32-48-400-010).
Subtask 78-32-81-420-052-A ** ON A/C NOT FOR ALL Subtask 78-32-81-420-053-A ** ON A/C NOT FOR ALL C. Install the Translating Sleeve (Ref. AMM TASK 78-32-46-400-010) and/or (Ref. AMM TASK 78-32-76-400-010).
Subtask 78-32-81-440-050-A ** ON A/C NOT FOR ALL Subtask 78-32-81-410-050-A ** ON A/C NOT FOR ALL E. 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 78-32-81-710-050-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).
F. 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).