Visual Inspection of the Fan Frame Shroud [CFML]

TASK 72-24-10-210-801-A
Visual Inspection of the Fan Frame 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.

ZONE: 400

1. Reason for the Job
This procedure gives the criteria for the visual inspection of fan frame shroud.

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	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 72-24-10-340-801-A	Fan Frame Shroud - Local Repair of the Poly-Tetra-Fluoro-Ethylene (PTFE) Varnish in the V-groove
Fan Frame Shroud

3. Job Set-up
Subtask 72-24-10-941-050-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 a 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 72-24-10-010-050-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 72-24-10-420-050-A

A. Visual Inspection of the Two Fan Frame Shrouds
(1) Do a visual inspection of the fan frame shroud (1). Refer to the table that follows for the inspection areas.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual inspection of the V-groove (2):
A.Dents, nicks, scratches	Not serviceable
B.Fretting on the varnish area (4)	Any amount if dimension CD is between 0.091 in. (2.3 mm) and 0.106 in. (2.7 mm). Any amount if dimension CX is between 0.189 in. (4.8 mm) and 0.205 in. (5.2 mm).
C.Missing varnish PTFE in the varnish area (4)	Any amount	See the repair (Ref. AMM TASK 72-24-10-340-801).
D.Missing varnish PTFE in the varnish area (8)	6.2 in.2 (4000 mm2) of missing varnish PTFE	See the repair (Ref. AMM TASK 72-24-10-340-801).
E.Missing varnish PTFE in the varnish area (9)	3.1 in.2 (2000 mm2) of missing varnish PTFE	See the repair (Ref. AMM TASK 72-24-10-340-801).
F.Distortion of the forward flange (3)	Not serviceable
G.Tears, cracks	Not serviceable
2.Visual inspection of the V-groove seal (5):
A.Cracks, tears, crushed areas, missing parts	Cumulative length up to ten percent of the seal circumference	Contact your CFM representative.
3.Visual inspection of the visible inserts, rivets (6) and floating nuts (7):
A.Bent, torn, worn, cut inserts	Not serviceable	Contact your CFM representative.
B.Loose, missing inserts	Not serviceable	Contact your CFM representative.
C.Bent, torn, worn, cut rivets (6)	Not serviceable	Contact your CFM representative.
D.Loose, missing rivets (6)	Not serviceable	Contact your CFM representative.
E.Bent, torn, worn, cut floating nuts (7)	Not serviceable	Contact your CFM representative.
F.Loose, missing floating nuts (7).	Not serviceable	Contact your CFM representative.
4.Visual inspection of area A:
A.Tears, cracks.	Not serviceable
B.Nicks, dents, scratches	Not serviceable
C.Fretting, wear	Any amount up to 0.0007 in. (0.02 mm) in depth

5. Close-up
Subtask 72-24-10-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:53:10 UTC