Removal of the Fan Rotor Blades [CFMB]

TASK 72-21-00-000-007-A
Removal of the Fan Rotor Blades

CAUTION: ALL FAN ROTOR BLADES SHALL BE MATCHMARKED OR NUMBERED FOR ASSEMBLY IN ORIGINAL ALIGNMENT AND POSITION USING ONLY APPROVED MARKING MATERIAL.

ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
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	MAT - RUBBER
No specific	AR	WARNING NOTICE(S)
856A2631	1	STAND,STORAGE-FAN BLADES

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP5061)	temporary marking

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-00-000-005-A	Removal of the Spinner Front Cone
TASK 72-21-00-000-006-A	Removal of the Spinner Rear Cone
Removal of Fan Blades

3. Job Set-up
Subtask 72-21-00-941-069-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Put the ACCESS PLATFORM 1M(3 FT) in position.
(2) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(3) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(4) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(5) Install a MAT - PROTECTIVE in lower half of the inlet cowl.

Subtask 72-21-00-010-058-A ** ON A/C NOT FOR ALL

B. Preparation for Removal of the Fan Blades:
(1) Install a MAT - RUBBER in the inlet cowl before you go into it.
(2) Remove spinner front cone. (Ref. AMM TASK 72-21-00-000-005)
(3) Remove spinner rear cone. (Ref. AMM TASK 72-21-00-000-006)

NOTE: Removal will be easier if fan blade to be removed is placed at the 12 o'clock position.

4. Procedure
Subtask 72-21-00-020-065-A ** ON A/C NOT FOR ALL

A. Removal of the fan blades:

CAUTION: USE ONLY APPROVED MARKING MATERIAL TO PREVENT DAMAGE TO THE BLADES.

(1) Temporarily mark each blade (80) from 1 to 36 on their convex side. Use a temporary marking (Material No.CP5061) . Blade No. 1 will be the blade immediately above the offset hole in the fan disk bolt flange. Numbering is counter-clockwise (CCW), forward looking aft.
(2) Removal of the first and second fan blades circled 1 and 2.

NOTE: The removal of blades (80) is counterclockwise (CCW) after the first blade removed.

NOTE: Put the first blade to be removed at the 12 o'clock position to ease the removal.

(a) Remove spacer (70) from the fan blade circled 2 located immediately at left of the first blade circled 1 you want to remove.
Carefully lower blade circled 2 in its dovetail recess (this unlocks it from its engagement on the booster spool), and move it at a slope (inclined) to the left. Do not try to remove it now.
(b) Remove spacer (70) from the first blade circled 1 to be removed.
(c) Lower blade circled 1 in its dovetail recess (this unlocks it), and carrefully pull it forward while you move its left midspan shroud above the right midspan shroud of the (sloped) blade circled 2 at left. Remove blade circled 1.
(d) Remove blade.
(3) Removal of the 3rd to the 36th blades:
(a) The removal of the following blades is easier, done CCW, and as follows for each blade:
1 Remove spacer (70)
2 Remove blade (80).
(4) Put spacer (70) and fan blades from 1 through 36 in their related compartements on 856A2631 STAND,STORAGE-FAN BLADES (865A2631G01)

[Rev.10 from 2021] 2026.04.01 12:59:41 UTC