Adjustment of the Fan Cowl Doors [PW11]

TASK 71-13-00-820-802-A
Adjustment of the Fan Cowl Doors

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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

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	AIR SOURCE - REGULATED, FILTERED, DRY
No specific	1	GAGE - FEELER
No specific	1	GAGE - PUSH-PULL
No specific	1	VERNIER CALIPER
No specific	Torque wrench: range to between 16 and 12 lbf.in (0.18 and 0.14 m.daN )
No specific	Torque wrench: range to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )
No specific	Torque wrench: range to between 270 and 240 lbf.in (3.05 and 2.71 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU-0008)	thinner
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU2-0001)	alcohol, isopropyl
(Material No.PU4-0002)	epoxy primer, fluid resistant
(Material No.PU4-0002C)	base primer
(Material No.PU4-0002D)	base primer
(Material No.PU4-0002E)	base primer
(Material No.PU4-0004A)	curing solution, epoxy primer
(Material No.PU4-0005)	thinner
(Material No.PU4-0007)	converter
(Material No.PU4-0009)	curing solution

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 71-13-11-720-801-A	Functional Check of Fan Cowl Latch Tension
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Adjustment of the Fan Cowl Doors
Thrust Reverser Shims - Adjustment
Fan Cowl Doors - Clearances
Fan Cowl Aft Latch

3. Job Set-up
Subtask 71-13-00-941-076-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 71-13-00-010-101-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

Subtask 71-13-00-410-084-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the thrust reverser cowl-doors are closed (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR

4. Procedure
Subtask 71-13-00-140-051-A ** ON A/C NOT FOR ALL

A. Cleaning of the latches

WARNING: USE A PROTECTIVE EYE SHIELD OR GOGGLES WHEN YOU USE COMPRESSED AIR. IF YOU GET HIGH-PRESSURE AIR OR PARTICLES IN YOUR EYES, IN YOUR MOUTH OR ON YOUR SKIN, INJURY CAN OCCUR.

CAUTION: WHEN YOU OPEN OR CLOSE THE FAN COWL AFT LATCH (L3), OBEY THESE INSTRUCTIONS:

DO NOT OPEN THE LATCH HOOK MORE THAN NECESSARY TO DISENGAGE FROM OR ENGAGE THE KEEPER.
DO NOT MOVE THE LATCH HOOK TOO MUCH IN THE DIRECTION OF THE LATCH HANDLE OR PUT THE LATCH HOOK AGAINST THE LATCH HANDLE.
MAKE SURE THAT THE ANGULAR POSITION OF THE LATCH HOOK IS A MINIMUM OF 90 DEGREES FROM THE LATCH HANDLE.

IF YOU DO NOT OBEY THESE INSTRUCTIONS, THE LATCH CAN HIT THE ENGINE OIL TUBE AND CAUSE DAMAGE.

CAUTION: IF THERE IS SAND AND/OR DUST ON THE LATCHES, REMOVE THE CONTAMINATION WITH DRY, COMPRESSED AIR BEFORE YOU ADJUST THE LATCHES. SAND AND DUST IN THE LATCHES CAN CAUSE DAMAGE.

(1) If necessary, blow AIR SOURCE - REGULATED, FILTERED, DRY to remove the sand and dust particles from the latches.

Subtask 71-13-00-010-090-A ** ON A/C NOT FOR ALL

B. For forward (L1), center (L2) and aft (L3) latches, remove all washers (7), (10) and (11) from the left and right fan cowl doors at each alignment pin (12) and striker (8). Put the washers on the rear side of the housings. See the views B and C, on the sheet 2, of the figure:

Adjustment of the Fan Cowl Doors ** ON A/C NOT FOR ALL

Subtask 71-13-00-410-092-A ** ON A/C NOT FOR ALL

C. Slowly close the fan cowl doors. Make sure that the lower axial locators (2) and (3) and the upper axial locators (1) and (4) on the fan cowl doors engage the locator clips on the inlet cowl. Do not close the latches on the fan cowl doors.

Subtask 71-13-00-820-082-A ** ON A/C NOT FOR ALL

D. Adjust the closing force of the forward latch (L1).
(1) Close the center latch (L2) and the aft latch (L3). Leave the forward latch (L1) open.
(2) Measure the force necessary to close the forward latch (L1) with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(3) Make sure that the force necessary to close the latch is between 13 lbf (5.78 daN) and 18 lbf (8.01 daN).
(4) If the force to close the forward latch (L1) is not correct, adjust the star wheel on the latch until the force is correct.
(a) Open the forward latch (L1).
(b) Disconnect the latch hook from the associated keeper.
(c) Turn the star wheel clockwise on the forward latch (L1) to increase the force to close the latch, or counterclockwise to decrease the force to close the latch.
(d) Do the step 4.D.(2). again.

Subtask 71-13-00-820-072-A ** ON A/C NOT FOR ALL

E. Adjust the closing force of the aft latch (L3).
(1) Close the forward latch (L1) and the center latch (L2). Open the aft latch (L3).
(2) Measure the force necessary to close the forward latch (L3) with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(3) Make sure that the force necessary to close the latch is between 13 lbf (5.78 daN) and 18 lbf (8.01 daN).
(4) If the force to close the aft latch (L3) is not correct, adjust the star wheel on the latch until the force is correct.
(a) Open the aft latch (L3).
(b) Disconnect the latch hook from the associated keeper.
(c) Turn the star wheel clockwise on the latch (L3) to increase the force to close the latch, or counterclockwise to decrease the force to close the latch.
(d) Do the step 4.E.(2). again.

Subtask 71-13-00-820-074-A ** ON A/C NOT FOR ALL

F. Adjust the closing force of the center latch (L2).
(1) Close the forward latch (L1) and the aft latch (L3). Open the center latch (L2).
(2) Measure the force necessary to close the center latch (L2) with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(3) Make sure that the force necessary to close the latch is between 3 lbf (1.33 daN) and 5 lbf (2.22 daN).
(4) If the force to close the latch is not correct, adjust the star wheel on the latch until the force is correct:
(a) Open the center latch (L2).
(b) Disconnect the latch hook from the associated keeper.
(c) Turn the star wheel clockwise on the latch to increase the force to close the latch, or counterclockwise to decrease the force.
(d) Do the step 4.F.(2). again.

Subtask 71-13-00-820-087-A ** ON A/C NOT FOR ALL

G. Make sure that there is a clearance between the left and right fan cowl doors at the alignment pins and strikers.
(1) If there is clearance between the left and right fan cowl doors at the alignment pins and strikers, continue to step 4.H.
(2) If there is no clearance at one of the alignment pins or strikers, do the following:
(a) Adjust the shims on the thrust reverser

Thrust Reverser Shims - Adjustment ** ON A/C NOT FOR ALL

1 Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802).
2 Remove the 51 nuts (20), 51 washers (21) and (26), and 51 screws (22) and (23) that attach the rubstrip (24) and shims (25) to the thrust reverser torque box.
3 Add or remove shims (25) as necessary under the rubstrip (24).
4 Install the rubstrip (24) back on the thrust reverser torque box with the 51 screws (22) and (23), 51 washers (21) and (26), and 51 nuts (20).
5 Tighten the screws (22) and (23) until the rubstrip (24) and shims (25) are against the thrust reverser torque box and the end of the screws are at least flush with the nuts (20).

NOTE: A clearance of 0.100 in. (2.54 mm) or less is permitted under the land in between the fasteners.

6 TORQUE the nuts (20) to between 16 and 12 lbf.in (0.18 and 0.14 m.daN )

.
7 Do steps 4.D. thru 4.G. again.

Subtask 71-13-00-820-073-A ** ON A/C NOT FOR ALL

H. Adjust the clearance between the left and right fan cowl doors.
(1) Measure the clearance between the fan cowl doors at the forward and aft sides of the center latch (L2).
(2) Make sure the clearance at those places is between 0.059 in. (1.5 mm) and 0.400 in. (10.2 mm). See the view A-A, on the sheet 4, of the figure:

Adjustment of the Fan Cowl Doors ** ON A/C NOT FOR ALL

(3) If the clearance between the doors adjacent to the center latch (L2) is more than 0.400 in. (10.2 mm), increase the force to close the latch.
(a) Open the forward (L1) and aft (L3) latches.
(b) Disconnect the latch hook from the associated keeper.
(c) Turn the star wheel on the latches to increase the force to close the latch.
(d) Measure the force necessary to close the forward (L1) and aft (L3) latches with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(e) Make sure that the force to close the latches is not more than 18 lbf (8.01 daN).
(f) Do steps 4.H. again until the clearance between the fan cowl doors at the forward and aft sides of the center latch (L2) is between 0.059 in. (1.5 mm) and 0.400 in. (10.2 mm).

Subtask 71-13-00-820-076-A ** ON A/C NOT FOR ALL

I. Adjust the closing force of the forward (L1) and aft (L3) latches again.
(1) Make sure you closed the forward latch (L1), center latch (L2) and aft latch (L3).
(2) Open the forward latch (L1).
(3) Measure the force necessary to close the forward latch (L1) with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(4) Make sure that the force necessary to close the latch is between 13 lbf (5.78 daN) and 18 lbf (8.01 daN).
(5) If the force to close the forward latch (L1) is not correct, adjust the star wheel on the latch until the force is correct.
(a) Open the forward latch (L1).
(b) Disconnect the latch hook from the associated keeper.
(c) Turn the star wheel clockwise on the forward latch (L1) to increase the force to close the latch or counterclockwise to decrease the force.
(d) Measure the force necessary to close the forward latch (L1) with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(e) If the force is not between 13 lbf (5.78 daN) and 18 lbf (8.01 daN), do steps 4.J.(5)(a). thru 4.J.(5)(e). again.
(f) If the force is between 13 lbf (5.78 daN) and 18 lbf (8.01 daN), close the forward latch (L1) and continue to step 4.J.(6).
(6) Open the aft latch (L3).
(7) Measure the force necessary to close the aft latch (L3) with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(8) Make sure that the force necessary to close the latch is between 13 lbf (5.78 daN) and 18 lbf (8.01 daN).
(9) If the force to close the aft latch (L3) is not correct, adjust the star wheel on the latch until the force is correct.
(a) Open the aft latch (L3).
(b) Disconnect the latch hook from the associated keeper.
(c) Turn the star wheel clockwise on the aft latch (L3) to increase the force to close the latch or counterclockwise to decrease the force.
(d) Measure the force necessary to close the aft latch (L3) with a GAGE - PUSH-PULL (with a range of 0 lbf (0.00 daN) to 100 lbf (44.48 daN)) located 0.5 in. (12.70 mm) from the edge of the latch handle.
(e) If the force is not between 13 lbf (5.78 daN) and 18 lbf (8.01 daN), do steps 4.J.(9)(a). thru 4.J.(9)(e). again.
(f) If the force is between 13 lbf (5.78 daN) and 18 lbf (8.01 daN), close aft latch (L3).
(g) Do step 4.J.(1). thru step 4.J.(9). until the force to close the forward (L1) and aft (L3) latches is between 13 lbf (5.78 daN) and 18 lbf (8.01 daN).

Subtask 71-13-00-820-077-A ** ON A/C NOT FOR ALL

J. Adjust the closing force of the center latch (L2) again.
(1) Measure the force necessary to close the center latch (L2). If the force is not between 3 lbf (1.33 daN) and 5 lbf (2.22 daN), adjust the star wheel on the latch until the force is correct.
(a) Open the center latch (L2).
(b) Disconnect the latch hook from the associated keeper.
(c) Turn the star wheel clockwise on the latch to increase the force to close the latch or counterclockwise to decrease the force.
(d) Do step 4.K.(1). again.
(2) Measure the force necessary to close the forward (L1) and aft (L3) latches.
(3) Make sure that the force is at least 13 lbf (5.78 daN) for each latch. If the force to close the forward (L1) or aft (L3) latch is less than 13 lbf (5.78 daN), open the latches and turn the star wheel to increase the force to close the center latch (L2). Do steps 4.K.(1) thru 4.K.(2) again.
(4) Make sure that the center latch (L2) handle, when closed, does not move freely.

Subtask 71-13-00-820-078-A ** ON A/C NOT FOR ALL

K. Make sure that there is a clearance between the left and right fan cowl doors at the alignment pins and strikers.
(1) If there is no clearance at one of the alignment pins or strikers, do steps 4.D. thru 4.K. again.

Subtask 71-13-00-820-079-A ** ON A/C NOT FOR ALL

L. Check the fan cowl steps and gaps.
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802).
(2) Measure the clearance between the inlet cowl and the fan cowl doors at different areas. Make sure that the clearance is between the values in Table 1. See Table 1 and the figure:

Fan Cowl Doors - Clearances ** ON A/C NOT FOR ALL

Table 1 Clearances for Fan Cowl to Inlet Cowl

Location	X1	X2
20°	0.059 in. (1.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.136 in. (3.5 mm)
50°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.097 in. (2.5 mm)
80°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.058 in. (1.5 mm)
110°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.058 in. (1.5 mm)
140°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.058 in. (1.5 mm)
170°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.058 in. (1.5 mm)
220°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.058 in. (1.5 mm)
250°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.058 in. (1.5 mm)
280°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.058 in. (1.5 mm)
310°	0.020 in. (0.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.097 in. (2.5 mm)
340°	0.059 in. (1.5 mm) and 0.220 in. (5.6 mm)	-0.038 in. (-1.0 mm) and 0.136 in. (3.5 mm)

(3) Measure the clearance between the thrust reverser and the fan cowl doors at different areas. Make sure that the clearance is between the values in Table 2. See the Table 2 and the figure:

Fan Cowl Doors - Clearances ** ON A/C NOT FOR ALL

Table 2 Clearances for Fan Cowl to Thrust Reverser

Location	Y1	Y2
20°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
30°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
60°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
90°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
120°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
150°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
200°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
230°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
260°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
290°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
320°	0.118 in. (3.0 mm) and 0.433 in. (11.0 mm)	-0.112 in. (-2.8 mm) and 0.112 in. (2.8 mm)
340°	0.067 in. (1.7 mm) and 0.354 in. (9.0 mm)	-0.126 in. (-3.2 mm) and 0.078 in. (2.0 mm)
FC to HAP	0.118 in. (3.0 mm) and 0.315 in. (8.0 mm)	-0.118 in. (-3.0 mm) and 0.039 in. (1.0 mm)

(4) Measure the clearance between the left and right fan cowl doors. Make sure that the clearance is between 0.059 in. (1.5 mm) and 0.400 in. (10.2 mm).
(5) Measure the clearance between the fan cowl doors and the Inner Fixed Structure (IFS) latch beam. See the views B, C-C and D-D, on the sheets 4 and 5, to the figure:

Fan Cowl Doors - Clearances ** ON A/C NOT FOR ALL

(6) If the clearance is not correct, do the following:
(a) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802).
1 FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
2 FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(b) Adjust the shims on the thrust reverser. Refer to step 4.G.(2)(a).
(c) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802).
1 FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
2 FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(d) Open the forward (L1) and aft (L3) latches.
(e) Adjust the closing force of the forward (L1) and aft (L3) latches again. Refer to step 4.J.
(f) Adjust the closing force of the center latch (L2) again. Refer to step 4.K.
(g) Make sure there is clearance between the left and right fan cowl doors at the alignment pins and strikers. Refer to step 4.L.

Subtask 71-13-00-820-080-A ** ON A/C NOT FOR ALL

M. Adjust the alignment pins and strikers.
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802).
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(2) Accurately measure and record the clearance between the three alignment pins (12) adjacent to the three latches and the related bushings on the opposite door. Use a GAGE - FEELER or VERNIER CALIPER.
(3) Make sure the clearance is not greater than 0.016 in. (0.41 mm). See the view B-B, on the sheet 4, of the figure:

Adjustment of the Fan Cowl Doors ** ON A/C NOT FOR ALL

If the clearance is greater than 0.016 in. (0.406 mm), do the following:
(a) For each alignment pin (12) with a clearance, do the following:
1 Remove the alignment pin (12) and the related washers (10) and (11) and nut (13) from the right fan cowl door.
2 Clean the alignment pin (12), nut (13), and washers (10) and (11) with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Clean the mating surfaces of the keeper with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean, dry lint-free cotton cloth (Material No.PU1-0001) before it dries.
3 Mix the PU4-0002epoxy primer, fluid resistant (or as an alternative base primer (Material No.PU4-0002C) or base primer (Material No.PU4-0002D) with curing solution (Material No.PU4-0009) or base primer (Material No.PU4-0002E) with converter (Material No.PU4-0007) ), PU4-0004Acuring solution, epoxy primer and thinner (Material No.PU4-0005) (or as an alternative thinner (Material No.PU-0008) ). Refer to the instructions of the manufacturer.
4 Put a mixture of the washers (10) and (11) together so that they make the same depth as the clearance you recorded for that alignment pin (12) in step 4.N.(2). Put these washers adjacent to the alignment pin (12). Put the remaining washers adjacent to the nut (13) to keep the correct grip length.

NOTE: There are two different types of washers. The washer (11) has a thickness of 0.016 in. (0.406 mm) and the washer (10) has a thickness of 0.032 in. (0.813 mm).

NOTE: Use the washers and also turn the star wheel on the latch to get the correct clearance.

5 Apply a layer of the PU4-0002epoxy primer, fluid resistant mixture to the mating surface of the washers (10) and (11) that will touch the keeper.
a Apply a layer of the PU4-0002epoxy primer, fluid resistant mixture to the shaft of the alignment pin (12) and to the mating surfaces of the keeper. Make sure the mixture on the keeper is on an area that is larger than the washers (10) and (11) and the base of the alignment pin (12).
6 Install the alignment pin (12), washers (10) and (11) and nut (13) on the right fan cowl door.
7 TORQUE the nut (13) to between 270 and 240 lbf.in (3.05 and 2.71 m.daN )

.
(4) Accurately measure and record the clearance between the three strikers (8) adjacent to the three latches and the related washers on the opposite door. Use a GAGE - FEELER or VERNIER CALIPER.
(5) Make sure the clearance is not greater than 0.016 in. (0.41 mm). See the view C-C, on the sheet 4, of the figure:

Adjustment of the Fan Cowl Doors ** ON A/C NOT FOR ALL

If the clearance is greater than 0.016 in. (0.41 mm), do the following:
(a) For each striker (8) with a clearance, do the following:
1 Remove the striker (8) and the related bolt (9), washers (7) and (6) and nut (5) from the right fan cowl door.
2 Remove the opposite striker (8) and the related bolt (9), washers (7) and (6), and nut (5) from the left fan cowl door.
3 Clean the strikers (8), bolts (9), washers (7) and (6), and nuts (5) with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Clean the mating surfaces of the keeper and latch housing with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean, dry lint-free cotton cloth (Material No.PU1-0001) before it dries.
4 Put a mixture of the washers (7) and (6) together so that they make the same depth as the clearance you recorded for that striker (8) in step 4.N.(4). Put these washers adjacent to the striker (8). Put the remaining washers adjacent to the nut (5) to keep the correct grip length. Make sure the thickness of the washers (7) and (6) adjacent to the striker (8) is approximately the same on right and left fan cowl doors.

NOTE: There are two different types of washers. The washer (7) has a thickness between 0.026 in. (0.660 mm) and 0.034 in. (0.864 mm) and the washer (6) has a thickness between 0.022 in. (0.559 mm) and 0.028 in. (0.711 mm).

NOTE: Use the washers and also turn the star wheel on the latch to get the correct clearance.

5 Apply a layer of the PU4-0002epoxy primer, fluid resistant mixture to the mating surface of the washers (7) and (6) that will touch the keeper. Apply a layer of the PU4-0002epoxy primer, fluid resistant mixture to the shafts of the bolts (9) and to the mating surfaces of the keeper and latch housing. Make sure the mixture on the keeper and latch housing is on an area that is larger than the washers (7) and (6).
6 Install the striker (8), bolt (9), washers (7) and (6) and nut (5) on the right fan cowl door.
a TORQUE the nut (5) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )

.
7 Install the striker (8), bolt (9), washers (7) and (6), and nut (5) on the left cowl door.
a TORQUE the nut (5) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )

.
(6) Open the fan cowl door. (Ref. AMM TASK 71-13-00-010-802)

Subtask 71-13-00-820-081-A ** ON A/C NOT FOR ALL

N. Do a functional test of the latch tension to verify the gaps and closing force of the latches (Ref. AMM TASK 71-13-11-720-801).

5. Close-up
Subtask 71-13-00-410-098-A ** ON A/C NOT FOR ALL

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 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR

Subtask 71-13-00-942-061-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to its initial configuration.
(1) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:32:05 UTC