Visual Inspection of the Fan Blade Lock [CFML]

TASK 72-21-61-210-801-A
Visual Inspection of the Fan Blade Lock

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.

1. Reason for the Job
This procedure gives criteria for visual inspection of the fan blade locks.

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

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

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

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-20-000-801-A	Removal of the Fan Blades
Visual Inspection of Titanium Area
Visual Inspection of Honeycomb Area

3. Job Set-up
Subtask 72-21-61-941-050-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
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 72-21-61-010-050-A

B. Get Access
(1) Make sure that the fan blades are removed (Ref. AMM TASK 72-21-20-000-801).

4. Procedure
Subtask 72-21-61-210-050-A

A. Visual Inspection of the Fan Blade Locks (1)
(1) Do the visual inspection of all titanium area:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Cracks	Not serviceable.
2.Dents	Any amount up to 0.004 in. (0.10 mm).
3.Nicks	Any amount up to 0.004 in. (0.10 mm).
4.Scratches	Any amount up to 0.004 in. (0.10 mm).

(2) Do the visual inspection of the dimension A:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension A is between 0.2736 in. (6.95 mm) and 0.2776 in. (7.05 mm).

(3) Do the visual inspection of the dimension B:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension B is between 0.3878 in. (9.85 mm) and 0.3996 in. (10.15 mm).

(4) Do the visual inspection of the dimension C:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension C is between 1.25492 in. (31.87 mm) and 1.26083 in. (32.03 mm).

(5) Do the visual inspection of the dimension D:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension D is between 0.39272 in. (9.98 mm) and 0.39469 in. (10.03 mm).

(6) Do the visual inspection of the dimension E:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension E is between 2.09949 in. (53.33 mm) and 2.10406 in. (53.44 mm).

(7) Do the visual inspection of the dimension F:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension F is between 59.85 degrees and 60.15 degrees.

(8) Do the visual inspection of all honeycomb and sheet metal cover areas:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Honeycomb crushed or collapsed cells along the edges	- Not more than three locations - 0.0250 in. (0.63 mm) in depth - 0.18299 in. (4.65 mm) in length.
2.Honeycomb crushed or collapsed cells on all other areas	Not serviceable.
3.Honeycomb disbonding of the adhesive	Not serviceable.
4.Honeycomb cracks in the adhesive	Not serviceable.
5.Honeycomb sheet metal cover nicks, dents, scratches along the edges	- Not more than three locations - 0.0250 in. (0.63 mm) in depth - 0.18299 in. (4.65 mm) in length.
6.Honeycomb sheet metal cover nicks, dents, scratches on all other areas	- Not more than three locations - 0.01701 in. (0.43 mm) in depth - 0.07299 in. (1.85 mm) in length.

(9) Do the visual inspection of the dimension G:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension G is between 0.2264 in. (5.75 mm) and 0.2382 in. (6.05 mm).

(10) Do the visual inspection of the dimension H:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fretting, wear	Any amount, if dimension H is between 0.0142 in. (0.36 mm) and 0.0173 in. (0.44 mm).

5. Close-up
Subtask 72-21-61-942-050-A

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:52:12 UTC