Removal of the AFT Cascade Support Ring [IAE]

TASK 78-32-81-000-010-A
Removal of the AFT Cascade Support Ring

1. Reason for the Job
This task supplies the data to remove the Aft Cascade Support Ring.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening 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 78-32-19-000-010-A	Removal of the Thrust Reverser Deflector Boxes
TASK 78-32-43-000-010-A	Removal of the C-Duct Locking Actuator
TASK 78-32-46-000-010-A	Removal of the Left Thrust Reverser Translating Cowl
TASK 78-32-48-000-010-A	Removal of the C-Duct Non-Locking Actuator
TASK 78-32-76-000-010-A	Removal of the Right Translating Cowl
AFT Support Ring

3. Job Set-up
Subtask 78-32-81-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) 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) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 78-32-81-010-053-A ** ON A/C NOT FOR ALL

B. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 78-32-81-040-050-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust reverser.

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) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 78-32-81-010-050-A ** ON A/C NOT FOR ALL

D. Remove the Translating Sleeve (Ref. AMM TASK 78-32-46-000-010) and/or (Ref. AMM TASK 78-32-76-000-010).

Subtask 78-32-81-010-051-A ** ON A/C NOT FOR ALL

E. Remove the Deflector Boxes and Blank Cascades (Ref. AMM TASK 78-32-19-000-010).

Subtask 78-32-81-010-052-A ** ON A/C NOT FOR ALL

F. Remove the Thrust Reverser Actuators (Ref. AMM TASK 78-32-43-000-010) and (Ref. AMM TASK 78-32-48-000-010).

4. Procedure
Subtask 78-32-81-020-050-A ** ON A/C NOT FOR ALL

A. Remove the Aft Cascade Support Ring

AFT Support Ring ** ON A/C NOT FOR ALL

(1) Remove nut (7), washer (6), bushings (5) and (4), washer (3) and bolt (2) from the upper end of the Aft cascade support ring (1).
(2) Remove nut (8), washer (9), bushings (10) and (11), washer (12) and bolt (13) from the lower end of the Aft cascade support ring (1).
(3) Remove the Aft support ring (1).

[Rev.10 from 2021] 2026.04.01 03:29:54 UTC