Visual Inspection of Fan Blade Spacers [CFML]

TASK 72-21-41-210-801-A
Visual Inspection of Fan Blade Spacers

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 the visual inspection criteria for the fan blade spacers.

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. Referenced Information

REFERENCE	DESIGNATION
Fan Blade Spacer

3. Job Set-up
Subtask 72-21-41-941-050-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).
(3) Put an ACCESS PLATFORM 1M(3 FT) in position.
(4) Install MAT - PROTECTIVE in lower half of the inlet cowl.

4. Procedure
Subtask 72-21-41-210-050-A

A. Visual Inspection of the Fan Blades Spacers (1)

Fan Blade Spacer

(1) Visual examination of composite material outside head area

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1. Wear on areas in contact with the disk or the fan blade	- Area D: Permitted if thickness is not less than 0.1831 in. (4.65 mm) - Area E: Permitted.
2. Nick, dent	Permitted if not more than 0.020 in. (0.51 mm) in depth and 0.01 in.2 (6.45 mm2) in area for each nick or dent.
3. Scratch	Permitted if not more than 0.004 in. (0.10 mm) in depth.
4. Micro-crack or decohesion	Not permitted.
5. Tear or fiber breakage	Not permitted.

(2) Visual examination of composite in head area

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1. Tears, fiber breakage or missing material in extraction hole area	PRE SB 72-0400 Permitted if thickness is not less than 0.150 in. (3.81 mm) (composite with wearstrip). END OF PRE SB 72-0400 POST SB 72-0400 Permitted if thickness is not less than 0.138 in. (3.5 mm). END OF POST SB 72-0400
2. Tears, fiber breakage or missing material outer extraction hole area	Not permitted.
3. Micro-crack or decohesion	Permitted if within the extraction hole area.
4. Ovalisation of extraction hole	Permitted.
5. Nick, dent	Permitted if not more than 0.020 in. (0.51 mm) in depth and 0.01 in.2 (6.45 mm2) in area for each nick or dent.
6. Scratch	Permitted if not more than 0.008 in. (0.20 mm) in depth.
POST SB 72-0400
7. Wear in area B (flat area)	Permitted up to 0.1 mm (0.004 in.) in depth.
END OF POST SB 72-0400

(3) Visual examination of PU film in case of spacer with PU film 362-040-502-0.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1. Scratches	Permitted.
2. Missing, torn or unbounded material	Permitted after removal of unbounded material.
3. PU film worn through to the bases composite	Permitted.

(4) PRE SB 72-0400
Visual examination of the wear strips in area B (flat area)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1. Missing material, frayed, disbonded, wear	- Permitted if exposed area is less than 25 percent of the area and if thickness of exposed composite is not less than 0.1831 in. (4.65 mm) - Continue in service: 200 cycles permitted if exposed area is more than 25 percent of the area and thickness of visible composite is not less than 0.1831 in. (4.65 mm).
2. Dents	Permitted if thickness of head in dented area is not less than 0.1831 in. (4.65 mm) and if area is not more than 0.01 in.2 (6.45 mm2) for each dent.

(5) Visual examination of the wear strips in area A

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
In area A, missing wearstrip material, frayed, disbonded, worn or dented wearstrip are permitted.

(6) Visual examination of the wear strips in area C

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
In area C, missing wearstrip material, frayed, disbonded, worn or dented wearstrip are permitted. You must remove frayed or disbonded material.

END OF PRE SB 72-0400

5. Close-up
Subtask 72-21-41-942-050-A

A. Put the aircraft back to its initial configuration.
(1) Remove MAT - PROTECTIVE in lower half of the inlet cowl.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:51:54 UTC