Installation of Segment Shrouds 1 thru 5 [CFML]

TASK 72-24-01-400-801-A
Installation of Segment Shrouds 1 thru 5

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.

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 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 38.0 and 32.0 lbf.in (0.43 and 0.36 m.daN )
No specific	Torque wrench: range to between 36.5 and 33.5 lbf.in (0.41 and 0.38 m.daN )
No specific	Torque wrench: range to between 59.0 and 51.0 lbf.in (0.67 and 0.58 m.daN )
No specific	Torque wrench: range to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )
No specific	Torque wrench: range to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

B. Consumable Materials

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

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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. 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 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Segment Shroud 1 - PRE LEAP-1A SB 72-0232
Segment Shroud 3 - PRE LEAP-1A SB 72-0232
Segment Shroud 2 - PRE LEAP-1A SB 72-0232
Segment Shroud 4
Segment Shroud 5
Segment Shroud 3 - POST LEAP-1A SB 72-0232
Segment Shroud 2 - POST LEAP-1A SB 72-0232

3. Job Set-up
Subtask 72-24-01-941-053-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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate:

The ENG/MODE selector switch, and
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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 72-24-01-010-056-A

B. Get Access
(1) Make sure that the fan cowl doors are open (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) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 72-24-01-040-053-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-24-01-010-057-A

D. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 72-24-01-020-064-A

A. General
(1) Remove all the COVER - PROTECTION and CAP - PROTECTION from all the openings, tubes, hoses and connectors.
(2) Cover the openings of the VBV ducts and the ACC inlet duct as necessary.

Subtask 72-24-01-420-055-A

B. Installation of the Segment Shroud 1
(1) Install segment shroud 1 (1) as follows:
(a) Install the Variable Bleed Valve (VBV) duct 1 (5).
(b) Lubricate the threads of the three bolts (2), six bolts (3) and eight bolts (8) with graphite mineral Vaseline (Material No.CP2101) .
(c) Put segment shroud 1 (1) in position on the engine.
(d) Install the three bolts (2) that attach segment shroud 1 (1) to the fan hub frame (4).
(e) TORQUE the three bolts (2) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.
(f) Install the eight bolts (8) that attach segment shroud 1 (1) to strut 1 (7) and segment shroud 2 (6).
(g) TORQUE the eight bolts (8) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(h) Install the six bolts (3) that attach VBV duct 1 (5) to segment shroud 1 (1).
(i) TORQUE the six bolts (3) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.

PRE LEAP-1A SB 72-0232

(j) Install bolt (37) that attaches segment shroud 1 (1) to the shroud junction fitting (35).
(k) TORQUE the bolt (37) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.

END OF PRE LEAP-1A SB 72-0232

Subtask 72-24-01-420-056-A

C. Installation of Segment Shroud 2
(1) Install segment shroud 2 (6) as follows:
(a) Install the VBV duct 2 (9) and VBV duct 3 (15).
(b) Lubricate the threads of the eight bolts (10), 12 bolts (11) and six bolts (12) with graphite mineral Vaseline (Material No.CP2101) .
(c) Put segment shroud 2 (6) in position on the engine.
(d) Install the six bolts (12) that attach segment shroud 2 (6) to the fan hub frame (4).
(e) TORQUE the six bolts (12) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.
(f) Install the eight bolts (10) that attach segment shroud 2 (6) to segment shroud 1 (1) and segment shroud 3 (18).
(g) TORQUE the eight bolts (10) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(h) Install the 12 bolts (11) that attach VBV duct 2 (9) and VBV duct 3 (15) to segment shroud 2 (6).
(i) TORQUE the 12 bolts (11) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(j) Lubricate the threads of the screws (13) and screws (14) with engine oil (Material No.CP2442) .
(k) Install the two screws (13) that attach segment shroud 2 (6) to the bracket (16).
(l) Install the two screws (14) that attach segment shroud 2 (6) to the bracket (17).
(m) TORQUE the two screws (13) and two screws (14) to between 59.0 and 51.0 lbf.in (0.67 and 0.58 m.daN )

.

PRE LEAP-1A SB 72-0232

(n) Install the two bolts (47) that attach the segment shroud support 2 (6) to the two shroud junction fittings (35).
(o) TORQUE the two bolts (47) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.

END OF PRE LEAP-1A SB 72-0232

Subtask 72-24-01-420-057-A

D. Installation of Segment Shroud 3
(1) Install segment shroud 3 (18) as follows:
(a) Install the VBV duct 4 (19).
(b) Lubricate the threads of the three bolts (20), six bolts (21) and eight bolts (22) with graphite mineral Vaseline (Material No.CP2101) .
(c) Put segment shroud 3 (18) in position on the engine.
(d) Install the three bolts (20) that attach segment shroud 3 (18) to the fan hub frame (4).
(e) TORQUE the three bolts (20) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.
(f) Install the eight bolts (22) that attach segment shroud 3 (18) to segment shroud 2 (6) and strut 5 (23).
(g) TORQUE the eight bolts (22) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(h) Install the six bolts (21) that attach segment shroud 3 (18) to VBV duct 4 (19).
(i) TORQUE the six bolts (21) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.

PRE LEAP-1A SB 72-0232

(j) Install bolt (49) that attaches the segment shroud support 3 (18) to the shroud junction fitting (35).
(k) TORQUE the bolt (49) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.

END OF PRE LEAP-1A SB 72-0232

Subtask 72-24-01-420-058-A

E. Installation of Segment Shroud 4
(1) Install segment shroud 4 (30) as follows:
(a) Install the VBV duct 5 (31).
(b) Lubricate the threads of the three bolts (27), six bolts (28) and eight bolts (29) with graphite mineral Vaseline (Material No.CP2101) .
(c) Put segment shroud 4 (30) in position on the engine.
(d) Install the three bolts (27) that attach segment shroud 4 (30) to the fan hub frame (4).
(e) TORQUE the three bolts (27) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.
(f) Install the eight bolts (29) that attach segment shroud 4 (30) to strut 5 (23) and strut 6 (24).
(g) TORQUE the eight bolts (29) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(h) Install the six bolts (28) that attach segment shroud 4 (30) to VBV duct 5 (31).
(i) TORQUE the six bolts (28) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(j) Lubricate the threads of the two screws (26) with engine oil (Material No.CP2442) .
(k) Install the two screws (26) that attach segment shroud 4 (30) to the bracket (25).
(l) TORQUE the two screws (26) to between 59.0 and 51.0 lbf.in (0.67 and 0.58 m.daN )

.
(m) Lubricate the threads of the bolt (50) with engine oil (Material No.CP2442) .
(n) Install the bolt (50) and P clamp (43) that attach the harness (52) to the segment shroud 4 (30).
(o) TORQUE the bolt (50) to between 36.5 and 33.5 lbf.in (0.41 and 0.38 m.daN )

Subtask 72-24-01-420-059-A

F. Installation of Segment Shroud 5
(1) Install segment shroud 5 (39) as follows:
(a) Install the VBV duct 8 (42), VBV duct 7 (41), VBV duct 6 (40), and Active Clearance Control (ACC) inlet duct (36).
(b) Lubricate the threads of the eight bolts (32), 18 bolts (33) and eight bolts (34) with graphite mineral Vaseline (Material No.CP2101) .
(c) Put segment shroud 5 (39) and attached ACC inlet duct (36) in position on the engine.
(d) Install the eight bolts (34) that attach segment shroud 5 (39) to the fan hub frame (4).
(e) TORQUE the eight bolts (34) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.
(f) Install the eight bolts (32) that attach segment shroud 5 (39) to strut 1 (7) and strut 6 (24).
(g) TORQUE the eight bolts (32) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(h) Install the 18 bolts (33) that attach segment shroud 5 (39) to VBV duct 8 (42), VBV duct 7 (41) and VBV duct 6 (40).
(i) TORQUE the 18 bolts (33) to between 84 and 76 lbf.in (0.95 and 0.86 m.daN )

.
(j) TORQUE the hose clamp (38) to between 38.0 and 32.0 lbf.in (0.43 and 0.36 m.daN )

.
(k) Lubricate the threads of the eight screws (44) with engine oil (Material No.CP2442) .
(l) Install the eight screws (44) that attach the ACC inlet duct (36) to the segment shroud 5 (39).
(m) TORQUE the eight screws (44) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

5. Close-up
Subtask 72-24-01-410-052-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust-reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 72-24-01-440-051-A

B. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-24-01-410-053-A

C. Close Access
(1) 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
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:52:35 UTC