Visual Inspection of the Accessory Gearbox (AGB) Mounts [CFML]

TASK 72-63-00-210-803-A
Visual Inspection of the Accessory Gearbox (AGB) Mounts

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 criteria for the visual inspection of the AGB mounts.

NOTE: The inspection criteria below are applicable after the removal of the high metal.

NOTE: You can use equivalent alternatives for the standard tools, equipment and consumable materials.

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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

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 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Accessory Gearbox (AGB) Mounts

3. Job Set-up
Subtask 72-63-00-941-070-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 the 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 the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 72-63-00-010-084-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)
1 437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
1 447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 72-63-00-040-055-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 ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-63-00-010-085-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
1 451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
1 461AL 462AR

4. Procedure
Subtask 72-63-00-210-055-A

A. Visual Inspection of the four AGB Mounts

Accessory Gearbox (AGB) Mounts

(1) Do a visual inspection of the AGB lower rear mount (1), AGB lower front mount (2), AGB upper front mount (3) and AGB upper rear mount (4). Refer to the table below for the inspection area.

Table 601 - Visual Inspection

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual examination of diameters CV, CQ, BQ and CM:
A.Dents, nicks, scratches	Not serviceable.
B.Wear.	No limit if within the dimensional inspection limits.
2.Visual examination of diameters CU, CT, CO, CP, BN, BS, CK and CL:
A.Dents, nicks, scratches	Not serviceable.
B.Fretting.	No limit if within the dimensional inspection limits.
3.Visual examination of the AGB lower rear mount flange:
A.Dents, nicks, scratches	Not serviceable.
B.Fretting on the mating faces	No limit if dimension CW is within the dimensional inspection limits.
C.Tears, cracks.	Not serviceable.
4.Visual examination of the AGB lower front mount flange:
A.Dents, nicks, scratches	Not serviceable.
B.Fretting on the mating faces	No limit if dimension CR is within the dimensional inspection limits.
C.Tears, cracks.	Not serviceable.
5.Visual examination of the AGB upper front mount flange:
A.Dents, nicks, scratches	Not serviceable.
B.Fretting on the mating faces	No limit if dimension BO is within the dimensional inspection limits.
C.Tears, cracks.	Not serviceable.
6.Visual examination of the AGB upper rear mount flange:
A.Dents, nicks, scratches	Not serviceable.
B.Fretting on the mating faces	No limit if dimension CN is within the dimensional inspection limits.
C.Tears, cracks.	Not serviceable.
7.Visual examination of all the other surfaces of the AGB mounts:
A.Dents, nicks, scratches	Not serviceable.
B.Fretting on the mating faces	Not serviceable.
C.Tears, cracks.	Not serviceable.
8.Visual examination of the AGB bushing:
A.Missing	Not serviceable.
B.Loose.	Not serviceable.
9.Visual examination of the AGB mount pins (one pin per AGB mount)
A.Loose.	Not serviceable.

Subtask 72-63-00-220-050-A

B. Dimensional Information

Table 602 - Dimensional Information

Description	Minimum Finish Dimension	Maximum Finish Dimension
DIA BN*	0.315 in. (8.001 mm)	0.316 in. (8.026 mm)
DIM BO*	0.108 in. (2.74 mm)	0.120 in. (3.05 mm)
DIA BQ*	0.630 in. (16.002 mm)	0.631 in. (16.027 mm)
DIA BS*	0.312 in. (7.925 mm)	0.314 in. (7.976 mm)
DIA CK*	0.315 in. (8.001 mm)	0.316 in. (8.026 mm)
DIA CL*	0.312 in. (7.925 mm)	0.314 in. (7.976 mm)
DIA CM*	0.787 in. (19.990 mm)	0.867 in. (22.022 mm)
DIM CN*	0.431 in. (10.947 mm)	0.443 in. (11.252 mm)
DIA CO*	0.315 in. (8.001 mm)	0.316 in. (8.026 mm)
DIA CP*	0.312 in. (7.925 mm)	0.314 in. (7.976 mm)
DIA CQ*	0.787 in. (19.990 mm)	0.867 in. (22.022 mm)
DIM CR*	0.900 in. (22.86 mm)	0.911 in. (23.14 mm)
DIA CT*	0.315 in. (8.001 mm)	0.316 in. (8.026 mm)
DIA CU*	0.312 in. (7.925 mm)	0.314 in. (7.976 mm)
DIA CV*	0.630 in. (16.002 mm)	0.631 in. (16.027 mm)
DIM CW*	0.781 in. (19.837 mm)	0.793 in. (20.142 mm)

NOTE: The use of the * means that these dimensions must be measured if the result of their visual examination shows an unacceptable condition, i.e. if their condition is out of the visual examination serviceable limits.

5. Close-up
Subtask 72-63-00-410-078-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
1 451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
1 461AL 462AR

Subtask 72-63-00-440-052-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-63-00-410-079-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
1 437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
1 447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:54:48 UTC