Removal of the Acoustic Shroud [CFML]

TASK 72-23-03-000-801-A
Removal of the Acoustic Shroud

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.

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 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-61-41-000-802-A	Removal of the Air Intake Cowl
TASK 73-21-65-000-802-A	Removal of the PS12 Line and Sensor
Acoustic Shroud

3. Job Set-up
Subtask 72-23-03-941-050-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,
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 72-23-03-010-050-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 2M (6 FT) - ADJUSTABLE in position.

4. Procedure
Subtask 72-23-03-020-050-A

A. Removal of the Acoustic Shroud

WARNING: WHEN YOU REMOVE/INSTALL THE ACOUSTIC SHROUD, BE CAREFUL NOT TO HIT THE T12 SENSOR. THE T12 SENSOR CAN CAUSE INJURY TO YOU.

(1) Remove the inlet cowl (2) (Ref. AMM TASK 71-61-41-000-802).
(2) Remove the PS12 Sensor (Ref. AMM TASK 73-21-65-000-802).
(3) Remove the 13 bolts (4) that attach the acoustic shroud (1) to the fan case (3).
(4) Carefully move the acoustic shroud (1) forward to disengage it from the fan case (3).
(5) Remove the acoustic shroud (1) from the engine.
(6) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and the disconnected connectors.

[Rev.10 from 2021] 2026.04.01 02:52:20 UTC