General Visual Inspection (GVI) of the Thrust Reverser (T/R) Left and Right Sync Tube and Over-the-Top Flex Tube [CFML]

TASK 78-31-44-210-802-A
General Visual Inspection (GVI) of the Thrust Reverser (T/R) Left and Right Sync Tube and Over-the-Top Flex Tube

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
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 71-13-00-410-803-A	Closing of the Fan Cowl Doors
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 78-31-44-000-802-A	Removal of the Sync Tubes, Sync Shafts, Flex Tubes and Flex Shaft
TASK 78-31-44-400-802-A	Installation of the Sync Tubes, Sync Shafts, Flex Tube and Flex Shaft
Right Sync Tube
Over-the-Top Flex Tube
Left Sync Tube

3. Job Set-up
Subtask 78-31-44-941-057-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 a WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
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 78-31-44-010-055-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) - ADJUSTABLE in position.

Subtask 78-31-44-040-055-A

C. Deactivation of the T/R 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 T/R system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

4. Procedure
Subtask 78-31-44-210-052-A

A. GVI of the T/R Left and Right Sync Tube and Over-the-Top Flex Tube
(1) Examine the right sync tube (1), left sync tube (3) and the over-the-top flex tube (2) for:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Left Sync Tube (3) and Right Sync Tube (1), Rigid Tube Sections
A.Cracks, nicks, scratches and burrs	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
B.Corrosion, deterioration, abrasion and permanent deformations	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
C.Chafing	Depth must not be more than 0.28 mm (0.011 in.)	If damaged beyond maximum serviceable limit, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
D.Dents	Depth must not be more than 0.45 mm (0.018 in.)	If damaged beyond maximum serviceable limit, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
2.Left Sync Tube (3) and Right Sync Tube (1), End Fittings
A.Cracks, nicks, scratches and burrs	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
B.Corrosion, deterioration, abrasion and permanent deformations	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
C.Damaged threads	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
D.Burnish marks and evidence of contact with gauges and fixtures	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
3.Left Sync Tube (3) and Right Sync Tube (1), Trombone Fittings
A.Evidence of hydraulic fluid leak	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
B.Cracks, nicks, scratches and burrs	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
C. Corrosion, deterioration, abrasion and permanent deformations	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
D.Chafing	Depth must not be more than 0.28 mm (0.011 in.)	If damaged beyond maximum serviceable limit, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
E.Dents	Depth must not be more than 0.45 mm (0.018 in.)	If damaged beyond maximum serviceable limit, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
4.Over-the-Top Flex Tube (2), External Fire Sleeve
A.Cracks, nicks, scratches and burrs	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
5.Over-the-Top Flex Tube (2), End Fittings
A.Cracks, nicks, scratches and burrs	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
B.Corrosion, deterioration, abrasion and permanent deformations	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
C.Damaged threads	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).
D.Burnish marks and evidence of contact with gauges and fixtures	Not serviceable	If damaged, replace the part (Ref. AMM TASK 78-31-44-000-802) and (Ref. AMM TASK 78-31-44-400-802).

5. Close-up
Subtask 78-31-44-440-053-A

A. Do the reactivation of the T/R system after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-31-44-410-054-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:35:19 UTC