Visual Inspection of the Fan Disk [CFML]

TASK 72-21-45-210-801-A
Visual Inspection of the Fan Disk

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 fan disk.

NOTE: The inspection criteria below are applicable after the removal of the 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	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-20-000-801-A	Removal of the Fan Blades
TASK 72-21-20-400-801-A	Installation of the Fan Blades
TASK 72-21-44-000-801-A	Removal of the Fan Disk Shields
TASK 72-21-44-400-801-A	Installation of the Fan Disk Shields
Fan Disk
Area M of the Fan Disk
Area P of the Fan Disk

3. Job Set-up
Subtask 72-21-45-941-050-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) Make sure that the WARNING NOTICE(S) are 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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).
(3) Install a MAT - PROTECTIVE in the lower half of the inlet cowl.

Subtask 72-21-45-010-050-A

B. Get Access
(1) Put an ACCESS PLATFORM 1M(3 FT) in position.
(2) Remove the fan blades and shields (Ref. AMM TASK 72-21-20-000-801) (Ref. AMM TASK 72-21-44-000-801).

4. Procedure
Subtask 72-21-45-210-050-A

A. Visual Inspection of the Fan Disk (1)

Fan Disk

Area M of the Fan Disk

Area P of the Fan Disk

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual inspection of all areas, except the dovetail slots, area D, area E, area H, area F, area J, area K and area L:
A.Dents	Any number, up to: 0.002 in. (0.05 mm) in depth 0.020 in. (0.51 mm) in length.
B.Nicks	Any number, up to: 0.002 in. (0.05 mm) in depth 0.020 in. (0.51 mm) in length.
C.Scratches	Any number, up to: 0.002 in. (0.05 mm) in depth 0.020 in. (0.51 mm) in length.
2.Visual inspection of area D:
A.Nicks, dents and scratches	If the indication is lower than 0.00098 in. (0.025 mm) deep, the part is serviceable. If the indication is included between 0.00098 in. (0.025 mm) and 0.00197 in. (0.050 mm) deep, a Continued-In-Service of 3000 cycles is permitted before part removal. If the indication is greater than 0.00197 in. (0.050 mm) deep, the part is not serviceable.
3.Visual inspection of the dovetail slots:
A.Nicks, dents, scratches and all other indications	Not serviceable
4.Visual inspection of area E:
A.Nicks, dents, scratches and all other indications	Not serviceable
5.Visual inspection of dia G:
A.Fretting/Wear	Any amount within limits: Minimum dia G of 0.2508 IN. (6.3703 MM) Maximum dia G of 0.2527 IN. (6.4186 MM).
6.Visual inspection of area H:
A.Nicks, dents, scratches and all other indications	Not serviceable
7.Visual inspection of area F:
A.Dents	Any number, up to: 0.00098 in. (0.02 mm) in depth 0.0098 in. (0.25 mm) in length.
B.Nicks	Any number, up to: 0.00098 in. (0.02 mm) in depth 0.0098 in. (0.25 mm) in length.
C.Scratches	Any number, up to: 0.00098 in. (0.025 mm) in depth 0.0098 in. (0.25 mm) in length.
8.Visual inspection of area K:
A.Nicks, dents and scratches	If the indication is lower than 0.00098 in. (0.025 mm) deep, the part is serviceable. If the indication is included between 0.00098 in. (0.025 mm) and 0.00197 in. (0.050 mm) deep, a Continued-In-Service of 3000 cycles is permitted before part removal. If the indication is greater than 0.00197 in. (0.050 mm) deep, the part is not serviceable.
9.Visual inspection of area J:
A.Scratches	Any number, up to: 0.0016 in. (0.04 mm) in depth 0.016 in. (0.41 mm) in length.
10.Visual inspection of downstream half holes circumference:
A.Dents	Any number, up to: 0.0212 in. (0.54 mm) in depth 0.2146 in. (5.45 mm) in length.
B.Nicks	Any number, up to: 0.0212 in. (0.54 mm) in depth 0.2146 in. (5.45 mm) in length.
C.Scratches	Any number, up to: 0.0212 in. (0.54 mm) in depth 0.2146 in. (5.45 mm) in length.
11.Visual inspection of area L:
A.Dents	Any number, up to 0.0020 in. (0.05 mm) in depth.
B.Nicks	Any number, up to 0.0020 in. (0.05 mm) in depth.
C.Scratches	Any number, up to 0.0020 in. (0.05 mm) in depth.
D.Fretting and wear	Any amount, up to 0.0020 in. (0.05 mm) in depth.
12.Visual inspection of area M and dovetail bottom:
A.Stains	Any amount.
13.Examine the area P:
A.Contact marks	Any amount with no depth.

5. Close-up
Subtask 72-21-45-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the fan blades and the shields (Ref. AMM TASK 72-21-20-400-801) (Ref. AMM TASK 72-21-44-400-801).
(3) Remove the MAT - PROTECTIVE from the lower half of the inlet cowl.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:52:05 UTC