Replacement of the Fan-Cowl Door Metallic-Strips [CFML]

TASK 71-13-17-390-801-A
Replacement of the Fan-Cowl Door Metallic-Strips

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: DO NOT EXTEND THE SLATS WHEN THE FAN COWLS AND THE THRUST REVERSER COWLS ARE OPEN. IF YOU DO THIS, DAMAGE TO THE AIRCRAFT CAN OCCUR.

ZONE: 400

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 2M (6 FT) - ADJUSTABLE
No specific	AR	CLAMPS
No specific	2	SCRAPER - NON METALLIC
No specific	AR	TAPE - ADHESIVE
No specific	AR	TAPE- TEFLON
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL00585)	ABRASIVE (Emery Cloth)
(Material No.CPNCL01343)	POLYSULFIDE SEALANT ADHESION PROMOTER (PR 148 AF)
(Material No.CPNCL01420)	SEALANT LOW DENSITY-FUEL TANK & GP
(Material No.CPNCL02069)	LINT-FREE COTTON CLOTH
(Material No.CPNCL02589)	GENERAL CLEANING AGENT - MULTI PURPOSE

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
23	METALLIC STRIPS	AIPC 71-13-10-14-010
24	METALLIC STRIPS	AIPC 71-13-10-14-020
15	METALLIC STRIPS	AIPC 71-13-10-14-030
13	METALLIC STRIPS	AIPC 71-13-10-14-040
14	METALLIC STRIPS	AIPC 71-13-10-14-050
16	METALLIC STRIPS	AIPC 71-13-10-14-060
17	METALLIC STRIPS	AIPC 71-13-10-14-070
18	METALLIC STRIPS	AIPC 71-13-10-14-080
19	METALLIC STRIPS	AIPC 71-13-10-14-090
20	METALLIC STRIPS	AIPC 71-13-10-14-100
21	METALLIC STRIPS	AIPC 71-13-10-14-110
22	METALLIC STRIPS	AIPC 71-13-10-14-120
36	METALLIC STRIPS	AIPC 71-13-10-14-130
37	METALLIC STRIPS	AIPC 71-13-10-14-150
38	METALLIC STRIPS	AIPC 71-13-10-14-160
39	METALLIC STRIPS	AIPC 71-13-10-14-170
40	METALLIC STRIPS	AIPC 71-13-10-14-190
41	METALLIC STRIPS	AIPC 71-13-10-14-200
42	METALLIC STRIPS	AIPC 71-13-10-14-210
43	METALLIC STRIPS	AIPC 71-13-10-14-230
44	METALLIC STRIPS	AIPC 71-13-10-14-240
45	METALLIC STRIPS	AIPC 71-13-10-14-250
46	METALLIC STRIPS	AIPC 71-13-10-14-260
1	METALLIC STRIPS	AIPC 71-13-11-15-010
2	METALLIC STRIPS	AIPC 71-13-11-15-020
5	METALLIC STRIPS	AIPC 71-13-11-15-030
3	METALLIC STRIPS	AIPC 71-13-11-15-040
4	METALLIC STRIPS	AIPC 71-13-11-15-050
6	METALLIC STRIPS	AIPC 71-13-11-15-060
7	METALLIC STRIPS	AIPC 71-13-11-15-070
8	METALLIC STRIPS	AIPC 71-13-11-15-080
9	METALLIC STRIPS	AIPC 71-13-11-15-090
10	METALLIC STRIPS	AIPC 71-13-11-15-100
11	METALLIC STRIPS	AIPC 71-13-11-15-110
12	METALLIC STRIPS	AIPC 71-13-11-15-120
25	METALLIC STRIPS	AIPC 71-13-11-15-130
26	METALLIC STRIPS	AIPC 71-13-11-15-150
27	METALLIC STRIPS	AIPC 71-13-11-15-160
28	METALLIC STRIPS	AIPC 71-13-11-15-170
29	METALLIC STRIPS	AIPC 71-13-11-15-190
30	METALLIC STRIPS	AIPC 71-13-11-15-200
31	METALLIC STRIPS	AIPC 71-13-11-15-210
32	METALLIC STRIPS	AIPC 71-13-11-15-230
33	METALLIC STRIPS	AIPC 71-13-11-15-240
34	METALLIC STRIPS	AIPC 71-13-11-15-250
35	METALLIC STRIPS	AIPC 71-13-11-15-260

E. 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
Fan-Cowl Door Metallic-Strips PRE SPOL BD-FC-18001, PRE SPOL BD-FC-18002, PRE SB BD70CR71-015 and PRE SB BD70CR71-023
Fan-Cowl Door Metallic-Strips POST SPOL BD-FC-18001, POST SPOL BD-FC-18002, POST SB BD70CR71-015 and POST SB BD70CR71-023
Fan-Cowl Metal-Door Metallic-Strips-Flange POST SPOL BD-FC-18001, POST SPOL BD-FC -18002, POST SB BD70CR71-015 and POST SB BD70CR71-023

3. Job Set-up
Subtask 71-13-17-941-055-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 71-13-17-010-052-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 2M (6 FT) - ADJUSTABLE in position.

4. Procedure
Subtask 71-13-17-020-051-A

A. Removal of the Fan-Cowl Door Metallic-Strips

PRE SPOL BD-FC-18001 AND PRE SB BD70CR71-015
PRE SPOL BD-FC-18002 AND PRE SB BD70CR71-023

(1) Remove all the sealant from the metallic strips to be replaced with the SCRAPER - NON METALLIC and CPNCL00585ABRASIVE (Emery Cloth) (150 grit).
(2) Remove and discard the metallic strips to be replaced, from the fan cowl skin.

END OF PRE SPOL BD-FC-18001 AND PRE SB BD70CR71-015
END OF PRE SPOL BD-FC-18002 AND PRE SB BD70CR71-023

Subtask 71-13-17-020-052-A

B. Removal of the Fan-Cowl Door Metallic-Strips

POST SPOL BD-FC-18001 AND POST SB BD70CR71-015
POST SPOL BD-FC-18002 AND POST SB BD70CR71-023

(1) Remove all the sealant from the metallic strips to be replaced with the SCRAPER - NON METALLIC and the CPNCL00585ABRASIVE (Emery Cloth) (150 grit).
(2) Remove and discard the metallic strips to be replaced, from the fan cowl skin.
(3) For the L-shape metallic strips (26), (27), (28), (29), (30), (31), (32), (33), (34), (37), (38), (39), (40), (41), (42), (43), (44) and (45) record the height of the L-shape metallic strips to be replaced. Refer to

Fan-Cowl Metal-Door Metallic-Strips-Flange POST SPOL BD-FC-18001, POST SPOL BD-FC -18002, POST SB BD70CR71-015 and POST SB BD70CR71-023

END OF POST SPOL BD-FC-18001 AND PRE SB BD70CR71-015
END OF POST SPOL BD-FC-18002 AND PRE SB BD70CR71-023

Subtask 71-13-17-420-051-A

C. Installation of the Fan-Cowl Door Metallic-Strips

PRE SPOL BD-FC-18001 AND PRE SB BD70CR71-015
PRE SPOL BD-FC-18002 AND PRE SB BD70CR71-023

(1) Clean the fan cowl skin with LINT-FREE COTTON CLOTH (Material No.CPNCL02069) made moist with GENERAL CLEANING AGENT - MULTI PURPOSE (Material No.CPNCL02589) .
(2) Apply a thin layer of SEALANT LOW DENSITY-FUEL TANK & GP (Material No.CPNCL01420) on the mating surfaces of the metallic strips to be replaced.
(3) Carefully put the metallic strips:

NOTE: Gap between the metallic strips: min 0.1 mm (0.004 in.) max 3.1 mm (0.122 in.).

NOTE: Gap between the metallic strip and the fan cowl door skin edge: min 0 mm (0 in.) max 2.6 mm (0.102 in.).

(4) Remove the unwanted sealant with the LINT-FREE COTTON CLOTH (Material No.CPNCL02069) made moist with the GENERAL CLEANING AGENT - MULTI PURPOSE (Material No.CPNCL02589) .
(5) Let the sealant cure. Refer to the manufacturer's instructions for the cure time.

END OF PRE SPOL BD-FC-18001 AND PRE SB BD70CR71-015
END OF PRE SPOL BD-FC-18002 AND PRE SB BD70CR71-023

Subtask 71-13-17-420-052-A

D. Installation of the Fan-Cowl Door Metallic-Strips

POST SPOL BD-FC-18001 AND POST SB BD70CR71-015
POST SPOL BD-FC-18002 AND POST SB BD70CR71-023

(1) Clean the fan cowl skin with the LINT-FREE COTTON CLOTH (Material No.CPNCL02069) made moist with the GENERAL CLEANING AGENT - MULTI PURPOSE (Material No.CPNCL02589) .
(2) Protection of the external skin from promoter and sealant during further steps:
(a) Install the TAPE - ADHESIVE on the outer side of the fan cowl, flush with the leading edge.
(3) Apply CPNCL01343POLYSULFIDE SEALANT ADHESION PROMOTER (PR 148 AF) on the contact surfaces of the metallic strips to be replaced and the fan cowl.
(4) Let the POLYSULFIDE SEALANT ADHESION PROMOTER (PR 148 AF) (Material No. CPNCL01343) cure 15 minutes.
(5) Apply a thin layer of the SEALANT LOW DENSITY-FUEL TANK & GP (Material No.CPNCL01420) on the mating surfaces of the metallic strips to be replaced.
(6) Install the TAPE- TEFLON thickness 5.00 mm (0.20 in.) on the outer face of the fan cowl with the TAPE - ADHESIVE.

CAUTION: MAKE SURE THAT THE METALLIC STRIPS ARE CORRECTLY SAFETIED WITH A CLAMP EVERY 50.00 MM (1.968 IN.). IF THEY ARE NOT, THERE IS A RISK OF METALLIC STRIP DISBOND IN SERVICE.

CAUTION: MAKE SURE THAT THE L METALLIC STRIPS ARE IN CORRECT POSITION AND IN CONTACT WITH THE INTERNAL SURFACE AND LEADING EDGE OF THE FAN COWL. IF THEY ARE NOT, THERE IS A RISK OF METALLIC STRIP DISBOND IN SERVICE.

CAUTION: PUT TEFLON PARTS ON THE TWO SIDES OF THE SKIN TO PROTECT THE EXTERNAL SKIN PAINT FROM DAMAGE AND TO HAVE A HOMOGENEOUS CRUSHING OF THE METALLIC STRIP DURING SEALING.

(7) Carefully put the metallic strips:

NOTE: For the L-shape metallic strips (26) or (27) or (28), (29) or (30) or (31), (32) or (33) or (34), (37) or (38) or (39), (40) or (41) or (42) and (43) or (44) or (45) use the height recorded in step 4.B.(3).

NOTE: Gap between the metallic strips (3), (6), (7), (8), (19), (20), (21) and (22): min 0.1 mm (0.004 in.) max 3.1 mm (0.122 in.).

NOTE: Gap between the metallic strips (3), (6), (7), (8), (19), (20), (21) and (22) and the fan cowl door skin edge: min 0 mm (0 in.) max 2.6 mm (0.102 in.).

NOTE: Gap between the flat metallic strips (25), (35), (36) and (46) and the reference line: min 0.1 mm (0.004 in.) max 2.1 mm (0.083 in.).

NOTE: Gap between the flat metallic strips (25), (35), (36), (46), L-shape metallic strips (26) or (27) or (28), (29) or (30) or (31), (32) or (33) or (34), (37) or (38) or (39), (40) or (41) or (42) and (43) or (44) or (45) and the fan cowl door skin edge: min 0.20 mm (0.008 in.) max 2.6 mm (0.102 in.).

NOTE: Gap between the L-shape metallic strips (26) or (27) or (28) and (29) or (30) or (31) and (32) or (33) or (34): min 0.1 mm (0.004 in.) max 2.1 mm (0.083 in.).

NOTE: Gap between the L-shape metallic strips (37) or (38) or (39) and (40) or (41) or (42) and (43) or (44) or (45): min 0.1 mm (0.004 in.) max 2.1 mm (0.083 in.).

(8) Install the TAPE- TEFLON thickness 5.00 mm (0.20 in.) in position on the metallic strips and secure with the CLAMPS every 50.00 mm (1.969 in.).
(9) Remove the unwanted sealant with the LINT-FREE COTTON CLOTH (Material No.CPNCL02069) made moist with the GENERAL CLEANING AGENT - MULTI PURPOSE (Material No.CPNCL02589) .
(10) Let the sealant cure. Refer to the manufacturer's instructions for the cure time.
(11) Remove the TAPE- TEFLON thickness 5.00 mm (0.20 in.) and the TAPE - ADHESIVE from the fan cowl.
(12) Clean the work area with the LINT-FREE COTTON CLOTH (Material No.CPNCL02069) made moist with the GENERAL CLEANING AGENT - MULTI PURPOSE (Material No.CPNCL02589) .

END OF POST SPOL BD-FC-18001 AND POST SB BD70CR71-015
END OF POST SPOL BD-FC-18002 AND POST SB BD70CR71-023

5. Close-up
Subtask 71-13-17-410-051-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] 2026.04.02 06:33:21 UTC