Removal of the Exhaust Nozzle [CFML]

TASK 78-12-40-000-801-A
Removal of the Exhaust Nozzle

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.

CAUTION: THIS PART IS A REMOVABLE STRUCTURAL COMPONENT (RSC), WHICH CAN BE MOVED BETWEEN AIRCRAFT. THUS IT CAN HAVE DIFFERENT OPERATION CONDITIONS AND A DIFFERENT LIFE RECORD (FLIGHT HOURS/FLIGHT CYCLES/CALENDAR) FROM THE AIRCRAFT IT IS INSTALLED ON OR REMOVED FROM. THE OPERATOR IS RESPONSIBLE FOR THE SPECIFIC TRACKING AND CONTINUED AIRWORTHINESS OF REMOVABLE STRUCTURAL COMPONENTS. INCORRECT MAINTENANCE OF THESE COMPONENTS CAN CAUSE A RISK FOR THE FLIGHT SAFETY.

1. Reason for the Job
Two persons are necessary to do this task.
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)
98N7810H001-000	1	EXHAUST DOLLY
98N7810H004-000	1	EXHAUST SHOCK ABSORBER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 54-56-00-000-803-A	Removal of the Aft Pylon Fairing (APF)
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
Exhaust Nozzle

3. Job Set-up
Subtask 78-12-40-941-050-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, 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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-12-40-010-050-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 1M(3 FT) in position.

Subtask 78-12-40-040-050-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 (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-12-40-010-051-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) Remove the left and right Aft Pylon Fairings (Ref. AMM TASK 54-56-00-000-803).
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
473AL 473AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
483AL 483AR

4. Procedure
Subtask 78-12-40-020-050-A

A. Removal of the Exhaust Nozzle
(1) Install the 98N7810H004-000 EXHAUST SHOCK ABSORBER (9) on the front plug.
(2) Remove the bolts (2) and washers (3) from positions 1 to 6 and 43 to 48.
(3) Removal of the fasteners and pads (5) and (6) from the nozzle (1):
(a) Remove the nuts (4), the two washers (3), bolts (2) and pads (5) and (6) from positions 8 to 11, 14 to 17, 23 to 26, 32 to 35 and 38 to 41.
(4) Removal of the fasteners from the nozzle (1):
(a) Remove the nuts (4), the two washers (3) and bolts (2) from positions 7, 18 to 22, 27 to 31 and 42.
(5) Removal of the last fasteners

WARNING: MAKE SURE THAT TWO MECHANICS ARE AVAILABLE FOR THIS OPERATION. ONE MECHANIC MUST HOLD THE NOZZLE TO PREVENT ITS FALL WHEN THE OTHER MECHANIC REMOVES THE LAST FASTENERS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

(a) Hold the nozzle (1) in position.
(b) Removal of the last fasteners from the nozzle (1):
1 Remove the nuts (4), the two washers (3) and bolts (2) from positions 12, 13, 36 and 37.
(6) Removal of the nozzle

CAUTION: BE CAREFUL NOT TO CAUSE DAMAGE TO THE ADJACENT PARTS DURING REMOVAL/INSTALLATION OF THE NOZZLE.

(a) Carefully remove the nozzle (1).
(7) Install the nozzle (1) on the 98N7810H001-000 EXHAUST DOLLY or transportation box.

[Rev.10 from 2021] 2026.04.01 13:03:35 UTC