Discard of Exhaust Outer and Inner Finger Seals [CFML]

TASK 78-12-41-960-801-A
Discard of Exhaust Outer and Inner Finger Seals

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
Refer to the MPD TASK: 781000-L2
DISCARD OF EXHAUST OUTER AND INNER FINGER SEALS.
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 0.39 and 0.29 m.daN (34.51 and 25.66 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(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, 451AL, 452AR, 473AL, 473AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR, 483AL, 483AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	FINGER SEALS	AIPC 78-11-41-10-050

E. Referenced Information

REFERENCE	DESIGNATION
TASK 54-57-22-000-815-A	Removal of the Rear Mount Fairing (RMF) Door
TASK 54-57-22-400-815-A	Installation of the Rear Mount Fairing (RMF) Door
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 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
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
Replacement of the Finger Seals

3. Job Set-up
Subtask 78-12-41-941-053-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) 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 78-12-41-010-062-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

Subtask 78-12-41-040-054-A

C. Deactivation of the Thrust Reverser System for Nacelle 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) Do the deactivation of the thrust reverser system for nacelle maintenance (ICU) (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-12-41-010-063-A

D. Get Access
(1) Open the thrust-reverser cowl doors (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
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-12-41-010-064-A

E. Get Access
(1) Remove the Rear Mount Fairing (RMF) doors (Ref. AMM TASK 54-57-22-000-815):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
473AL 473AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
483AL 483AR

4. Procedure
Subtask 78-12-41-020-051-A

A. Removal of the Finger Seals

NOTE: This procedure is given for one set of finger seals (2) and it is the same for the other five sets of finger seals (2).

NOTE: In order to disengage the set to be removed from the above nearest set, its first screw has to be untightened.

NOTE: Remove the sets of finger seals (2) from the left side to the right side of the thrust reverser.

NOTE: It is possible to remove only one set of finger seals (2). To do so, pull the side laying on one adjacent set and slide it from under the other adjacent set.

(1) Remove the three screws (1) that attach the set of finger seals (2) to the support (3).
(2) Remove and discard the set of finger seals (2).

Subtask 78-12-41-420-051-A

B. Installation of the Finger Seals

NOTE: This procedure is given for one set of finger seals (2) and it is the same for the other five sets of finger seals (2).

NOTE: Install the sets of finger seals (2) from the right side to the left side of the thrust reverser.

NOTE: It is possible to install only one set of finger seals (2). To do so, slide it under the adjacent set on one side and position it on the other adjacent set.

(1) Clean the parts to be installed and the contact surfaces with a LINT-FREE COTTON CLOTH (Material No.CPNCL02069) made moist with GENERAL CLEANING AGENT - MULTI PURPOSE (Material No.CPNCL02589) .
(2) Put the set of new AIPC 78-11-41-10-050 FINGER SEALS (2) in position.
(3) Compress the set of new finger seals (2) in contact with the support (3).
(4) Install the three screws (1).
(5) TORQUE the three screws (1) to between 0.39 and 0.29 m.daN (34.51 and 25.66 lbf.in )

plus the one untightened on the nearest set.

5. Close-up
Subtask 78-12-41-410-059-A

A. Installation of the RMF Doors
(1) Do a check that the nozzle finger seal is fully engaged under the aft pylon fairing. If not, engage it manually.
(2) Install the RMF doors (Ref. AMM TASK 54-57-22-400-815):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
473AL 473AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
483AL 483AR

Subtask 78-12-41-410-060-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) 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 78-12-41-440-054-A

C. Do the reactivation of the thrust reverser after nacelle maintenance (ICU) (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-12-41-410-061-A

D. 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).

[Rev.10 from 2021] 2026.04.01 13:13:22 UTC