Removal of the Exhaust Front Plug [CFML]

TASK 78-11-40-000-801-A
Removal of the Exhaust Front Plug

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.

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	STEPLADDER 0.5 M (1.6 FT)
No specific	AR	WARNING NOTICE(S)
98N7810H001-000	1	EXHAUST DOLLY
98N7810H004-000	1	EXHAUST SHOCK ABSORBER
98N7810H005-000	1	FORWARD PLUG PROTECTION RUG

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 78-11-41-000-803-A	Removal of the Exhaust Rear Plug
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
Exhaust Front Plug

3. Job Set-up
Subtask 78-11-40-941-050-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).
(3) Put a STEPLADDER 0.5 M (1.6 FT) in position.

Subtask 78-11-40-040-050-A

B. 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 78-11-40-010-057-A

C. Get Access
(1) Remove the exhaust rear plug (Ref. AMM TASK 78-11-41-000-803).

4. Procedure
Subtask 78-11-40-420-052-A

A. Installation of the Protection

WARNING: MAKE SURE THAT THE EXHAUST FRONT PLUG CANNOT FALL AFTER THE REMOVAL OF ALL THE FASTENERS. THE EXHAUST FRONT PLUG WEIGHS 18 KG (39.68 LB).

(1) Install the 98N7810H004-000 EXHAUST SHOCK ABSORBER on the lower area of the exhaust nozzle.
(2) Install the 98N7810H005-000 FORWARD PLUG PROTECTION RUG on the lower area of the inside front plug.

Subtask 78-11-40-020-051-A

B. Removal of the Exhaust Front Plug

WARNING: TWO MECHANICS ARE NECESSARY TO REMOVE AND INSTALL THE EXHAUST FRONT PLUG. ONE MUST HOLD THE END OF THE EXHAUST FRONT PLUG ASSEMBLY WHILE THE OTHER MUST REMOVE OR INSTALL THE BOLTS AND WASHERS. THE EXHAUST FRONT PLUG ASSEMBLY WEIGHS 18KG (39.68 LBS).

CAUTION: BE CAREFUL NOT TO CAUSE DAMAGE TO THE BOLT HOLE FLANGES WHEN YOU REMOVE THE BOLTS.

(1) Loosen all the bolts (2).
(2) Remove the bolts (2) and washers (3), except bolts (2) and washers (3) from the position numbers 8, 23, 30 and 15.
(3) Hold the exhaust front plug while you remove the bolts (2) and washers (3) from the bolt positions numbers 8, 23, 30 and 15.
(4) Remove the exhaust front plug (1).
(5) Put the exhaust front plug (1) on the 98N7810H001-000 EXHAUST DOLLY.

[Rev.10 from 2021] 2026.04.01 13:04:26 UTC