Installation of the Spinner Rear Cone [CFMB]

TASK 72-21-00-400-006-A
Installation of the Spinner Rear Cone

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	GAGE - SET, FEELER
No specific	AR	GUN - HOT AIR
No specific	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )
856A3409	1	PIN,GUIDE-SPINNER REAR CONE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-00-000-006-A	Removal of the Spinner Rear Cone
TASK 72-21-00-400-005-A	Installation of the Spinner Front Cone
Spinner Front and Rear Cones
Post Installation Checks of the Spinner Rear Cone

3. Job Set-up
Subtask 72-21-00-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
(2) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(3) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(4) Make sure that the MAT - PROTECTIVE is in position.

4. Procedure
Subtask 72-21-00-480-058-A ** ON A/C NOT FOR ALL

A. Install the guide pins as follows:
(1) Apply a thin layer of engine oil (Material No.CP2442) to the 3 pins of the 856A3409 PIN,GUIDE-SPINNER REAR CONE (856A3409G01).
(2) Install the 3 pins, equally spaced, on the forward flange of the fan disk. Install one of the pins in the offset hole of the flange.

Subtask 72-21-00-420-067-A ** ON A/C NOT FOR ALL

B. Install the spinner rear cone as follows:
(1) Apply a thin layer of graphite grease (Material No.CP2101) to the threads of the bolts (30).
(2) Safety precautions

WARNING: USE THERMAL GLOVES WHEN YOU MOVE OR TOUCH HOT OR COLD PARTS. HOT OR COLD PARTS CAN CAUSE INJURY.

(a) Increase the temperature of the aft flange of spinner rear cone (20) to 60 deg.C (140.00 deg.F) with a GUN - HOT AIR.
(3) Install the spinner rear cone.

CAUTION: TAKE CARE NOT TO LET THE SPINNER REAR CONE FALL WHEN YOU INSTALL IT ON THE FAN DISK. DAMAGE TO THE CONE COULD RESULT.

(a) Install the spinner rear cone on the fan disk forward flange as follows:
1 Align the offset holes.

NOTE: The offset hole in the spinner rear cone is identified by a spherical indentation on its rear flange.

2 Install the three equally-spaced bolts (30) and washers (10) and tighten them until the rear cone comes fully against the forward flange of fan disk. While you do this, make sure that the lip of the rear cone seal engages correctly under the front edge of the fan blade platforms.
(4) Let the assembly return to ambient temperature. Remove the 3 pins of the 856A3409 PIN,GUIDE-SPINNER REAR CONE (856A3409G01).
(5) Install the remaining bolts (30) and washers (10).
(6) TORQUE all the bolts (30) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

Subtask 72-21-00-220-056-A ** ON A/C NOT FOR ALL

C. Do a check of the spinner rear cone on fan disk for correct installation as follows:

Post Installation Checks of the Spinner Rear Cone ** ON A/C NOT FOR ALL

(1) Make sure that the spinner rear cone is correctly installed against the fan disk flange at location A.
(a) Do this check at a minimum of 6 locations, and radially to the flange scallops.
(b) The spinner rear cone is correctly installed against the fan disk flange if you cannot put a feeler gage of 0.001 in. (0.03 mm) maximum thickness between two flange scallops at the specified 6 locations marked A.
(c) If you can put the 0.001 in. (0.03 mm) feeler gage at two or three consecutive locations, the spinner rear cone is incorrectly installed in the related sector. Before you do anything else, make sure that the bolts in this sector are correctly torqued. If the installation is incorrect again after this check, remove the spinner rear cone (Ref. AMM TASK 72-21-00-000-006), find the cause and correct it.
(2) Make a check of the Gap F34 over 360 degrees with a GAGE - SET, FEELER.

NOTE: The gap F34 is the blueprint clearance, or gap, between the aft edge of the spinner rear cone and the front edge of the fan blade platforms after installation.

(a) The gap F34 must measure between: 0.0098 in. (0.249 mm) and 0.0374 in. (0.950 mm).
(b) If this gap F34 is out of limits at any location of the circumference, remove the rear cone (Ref. AMM TASK 72-21-00-000-006), find the cause (see the NOTE) and correct it.

NOTE: The cause might be a misinstalled blade on the fan disk, a FOD damaged blade in the platform area, or an out-of-shape aft flange of the spinner rear cone, for example.

Subtask 72-21-00-410-060-A ** ON A/C NOT FOR ALL

D. Install the spinner front cone (Ref. AMM TASK 72-21-00-400-005).

5. Close-up
Subtask 72-21-00-869-063-A ** ON A/C NOT FOR ALL

A. Make sure that the work area is clean and clear of tools and other items.

Subtask 72-21-00-942-062-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Remove the MAT - PROTECTIVE from the inlet cowl.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 12:59:40 UTC