Visual Inspection of the Platform Front Shroud [CFML]

TASK 72-21-60-210-801-A
Visual Inspection of the Platform Front Shroud

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 platform front shroud.

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
TASK 72-21-60-300-801-A	Blend Repair of the Platform Front Shroud
TASK 72-21-60-300-802-A	Replacement of the Self-Locking Shank Nuts on the Platform Front Shroud
Platform front shroud

3. Job Set-up
Subtask 72-21-60-941-052-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 72-21-60-020-051-A

B. Removal of the Fan Blade
(1) Make sure that the fan blades are removed (Ref. AMM TASK 72-21-20-000-801).

4. Procedure
Subtask 72-21-60-210-050-A

A. Visual inspection of the Platform Front Shroud (1)
(1) Do the visual inspection of all areas.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Dents	Any amount up to: 0.004 in. (0.10 mm) in depth 0.04 in. (1.02 mm) in length.
2.Nicks	Any amount up to: 0.004 in. (0.10 mm) in depth 0.04 in. (1.02 mm) in length.
3.Scratches	Any amount up to: 0.004 in. (0.10 mm) in depth 0.04 in. (1.02 mm) in length.
4.Cracks	Not serviceable.
5.Damage by rotating crimped self locking nuts	Not serviceable.

(2) Visual inspection of crimped self locking nuts, type A (2)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Loss of self locking quality	Not serviceable if running torque is less than 3.5 lbf.in (0.04 m.daN).	See repair (Ref. AMM TASK 72-21-60-300-802).
2.Internal threads torn, bent, worn, missing fully or not	Not serviceable	See repair (Ref. AMM TASK 72-21-60-300-802).
3.Looseness	Not serviceable	See repair (Ref. AMM TASK 72-21-60-300-802).
4.Missing nut	Not serviceable	See repair (Ref. AMM TASK 72-21-60-300-802).

(3) Visual inspection of dimension L

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Peening	Any amount, if dimension L is between 0.075 in. (1.90 mm) and 0.083 in. (2.11 mm).
2.Fretting, wear	Any amount, if dimension L is between 0.075 in. (1.90 mm) and 0.083 in. (2.11 mm).

(4) Visual inspection of dimension N

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Peening	Any amount, if dimension N is between 0.173 in. (4.39 mm) and 0.181 in. (4.60 mm).
2.Fretting, wear	Any amount, if dimension N is between 0.173 in. (4.39 mm) and 0.181 in. (4.60 mm).

(5) Visual inspection of diameter D

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Peening	Any amount, if dimension D is between 16.54 in. (0.4201 m) and 16.551 in. (0.4204 m).

(6) Visual inspection of diameter F

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Peening	Any amount, if dimension F is between 19.2776 in. (0.4897 m) and 19.2815 in. (0.4897 m).
2.Fretting, wear	Any amount, if dimension F is between 19.2776 in. (0.4897 m) and 19.2815 in. (0.4897 m).

(7) Visual inspection of dimension M

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Peening	Any amount, if dimension M is between 0.1161 in. (2.95 mm) and 0.1201 in. (3.05 mm).
2.Fretting, wear	Any amount, if dimension M is between 0.1161 in. (2.95 mm) and 0.1201 in. (3.05 mm).

(8) Visual inspection of diameter E

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Peening	Any amount, if dimension E is between 17.9740 in. (0.4565 m) and 17.9756 in. (0.4566 m).
2.Fretting, wear	Any amount, if dimension E is between 17.9740 in. (0.4565 m) and 17.9756 in. (0.4566 m).

(9) Visual inspection of area G

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Nicks, dents, scratches	Not serviceable.	Continue-In-Service of 2000 cycles is permitted if indication is up to 0.0098 in. (0.25 mm) in depth. Continue-In-Service of 800 cycles is permitted if indication is up to 0.0196 in. (0.5 mm) in depth.

(10) Visual inspection of area P

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Stains	Any amount with no depth.

(11) Visual inspection of area Q

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Nicks, dents, scratches	Any number up to: 0.004 in. (0.1 mm) in depth 0.04 in. (1.0 mm) in length.	See repair (Ref. AMM TASK 72-21-60-300-801).

5. Close-up
Subtask 72-21-60-942-051-A

A. Close Access
(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 13:03:35 UTC