General Visual Inspection (GVI) of the Cascades [CFML]

TASK 78-32-43-210-801-A
General Visual Inspection (GVI) of the Cascades

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400

1. Reason for the Job
This procedure gives the instructions to do a General Visual Inspection (GVI) of the thrust reverser cascades.
There are two types of cascades:

Regular cascades with vanes that turn the flow of air as it goes through the cascades
Blank cascades that do not permit the flow of air.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 73-29-00-740-804-A	Thrust Reverser Cycling Test (Menu Mode)
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-32-15-000-801-A	Removal of the Slat Panel
TASK 78-32-15-400-801-A	Installation of the Slat Panel
TASK 78-32-43-000-806-A	Removal of the Thrust Reverser Cascades
TASK 78-32-43-400-806-A	Installation of the Thrust Reverser Cascades
TASK 78-32-50-010-801-A	Manually Deploy the Translating Cowl
TASK 78-32-50-410-801-A	Manually Stow the Translating Cowl
TASK 78-36-45-000-801-A	Removal of the Thrust Reverser Hinge Access Panels
TASK 78-36-45-400-801-A	Installation of the Thrust Reverser Hinge Access Panels
General Visual Inspection (GVI) of the Cascades

3. Job Set-up
Subtask 78-32-43-941-065-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-32-43-010-082-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 2M (6 FT) in position.

Subtask 78-32-43-040-067-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-32-43-010-084-A

D. Get access
(1) Manually deploy the translating cowl (Ref. AMM TASK 78-32-50-010-801).
(2) To examine an upper cascade (cascades No. 1 thru No. 5), put an ACCESS PLATFORM 2M (6 FT) in position below the applicable fan cowl.

General Visual Inspection (GVI) of the Cascades

(3) To examine No. 1 or No. 2 cascade, remove the panels that follow from the applicable side of the engine:
(a) Remove the trust-reverser hinge access-panel (Ref. AMM TASK 78-36-45-000-801).
(b) Remove the slat clearance panel (Ref. AMM TASK 78-32-15-000-801).

4. Procedure
Subtask 78-32-43-210-053-A

A. General Visual Inspection (GVI) of the Cascades
(1) Examine the areas of the cascades that follow (these areas are known as elements):

Flanges
Vanes
Gussets
Strongbacks
Frames (frames are the same as strongbacks, but they are on the outer edges of the cascade)
Blank plates (blank plates are only on the blanking cascades).

(a) Loose material is not permitted. If found, replace the cascade (Ref. AMM TASK 78-32-43-000-806) and (Ref. AMM TASK 78-32-43-400-806).
(b) A crack that extends through the full thickness of an element is not permitted. If found, replace the cascade (Ref. AMM TASK 78-32-43-000-806) and (Ref. AMM TASK 78-32-43-400-806).
(c) A crack that extends into a fiber is not permitted. A crack in the resin that does not break a fiber is serviceable. If found, replace the cascade (Ref. AMM TASK 78-32-43-000-806) and (Ref. AMM TASK 78-32-43-400-806).
(d) A crack that starts at a bolt hole is not permitted. If found, replace the cascade (Ref. AMM TASK 78-32-43-000-806) and (Ref. AMM TASK 78-32-43-400-806).
(e) Delamination is not permitted. If found, replace the cascade (Ref. AMM TASK 78-32-43-000-806) and (Ref. AMM TASK 78-32-43-400-806).
(2) Examine each joint where two elements connect. A crack in a joint is not permitted.
(a) If a crack was found on the cascade, replace it (Ref. AMM TASK 78-32-43-000-806) and (Ref. AMM TASK 78-32-43-400-806).
(b) If a crack was found on another element of the joint, contact SAFRAN Nacelles.

5. Close-up
Subtask 78-32-43-410-067-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the slat clearance panels (Ref. AMM TASK 78-32-15-400-801).
(3) Install the thrust-reverser hinge access-panels (Ref. AMM TASK 78-36-45-400-801).
(4) Manually stow the translating cowl (Ref. AMM TASK 78-32-50-410-801).

Subtask 78-32-43-440-058-A

B. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-32-43-710-051-A

C. Test
(1) Do the thrust reverser cycling test (Ref. AMM TASK 73-29-00-740-804).

[Rev.10 from 2021] 2026.04.01 03:36:10 UTC