Installation of the Nozzle Pads [CFML]

TASK 78-12-42-400-801-A
Installation of the Nozzle Pads

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.

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	1	WRENCH - TORQUE
No specific	Torque wrench: range to between 1.40 and 1.20 m.daN (123.89 and 106.19 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
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	NUTS	AIPC 78-11-41-05-030

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
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
Nozzle Pads

3. Job Set-up
Subtask 78-12-42-941-051-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) are 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 78-12-42-010-052-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 78-12-42-040-051-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 nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-12-42-010-053-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 78-12-42-420-050-A

A. Installation of the Nozzle Pads

NOTE: This procedure is given for one pad (4) and is same for the other seven pads (4) and the other two pads (5).

NOTE: Start the installation of the pads from the position #8 and then continue in the clockwise direction.

(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) It is recommended to install new nuts (1).
(a) If you use new AIPC 78-11-41-05-030 NUTS (1), go to Step 4.A.(4).
(b) If you use old nuts (1), do the Step 4.A.(3) to check the condition of the nuts (1).
(3) Check the condition of the nut (1):
(a) Tighten the nut (1) with yours hands, until the self-locking device is fully engaged.
(b) Tighten the nut (1) with the WRENCH - TORQUE and make sure that the maximum locking torque value is not greater than the 0.34 m.daN (30.09 lbf.in).
(c) If the maximum locking torque value is not in the limits, discard and replace the AIPC 78-11-41-05-030 NUTS (1).
(d) Make sure that at least one and a half thread fillets of the bolt (3) extend after the nut (1).
(e) Loosen the nut (1) with the WRENCH - TORQUE.
(f) Make sure that the minimum breakaway torque value necessary is more than 0.04 m.daN (3.54 lbf.in).
(g) If the minimum breakaway torque value is not in the limits, discard and replace the nut (1).
(4) Installation of the pads (4):

CAUTION: MAKE SURE THAT THE PAD ORIENTATION IS CORRECT. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EQUIPMENT CAN OCCUR.

(a) Put the pad (4) in position.
(b) Install the bolts (3).
(c) Put the washers (2) and the nuts (1) in position.
(d) TORQUE the bolt (3) to between 1.40 and 1.20 m.daN (123.89 and 106.19 lbf.in )

.
(e) Loosen the bolts (3).
(f) TORQUE the bolts (3) to between 1.40 and 1.20 m.daN (123.89 and 106.19 lbf.in )

5. Close-up
Subtask 78-12-42-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the 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 78-12-42-440-050-A

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

Subtask 78-12-42-410-051-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:34:39 UTC