Installation of the Diffuser

TASK 36-11-49-400-838-A
Installation of the Diffuser

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

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: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 410
ZONE: 420

1. Reason for the Job

NOTE: Two persons are necessary to do this task. One person to hold the diffuser and one person to attach the bolts and washers below the pylon.

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	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	1	SCRAPER - NON METALLIC
No specific	AR	WARNING NOTICE(S)
98L12003001000	1	HARNESS,SAFETY

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06ACB1)	Polysulfide Sealant-Low Density Multi Purpose Fillet -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
191DB, 413BL, 413BR, 423BL, 423BR
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 27-00-00-080-002-A	Removal of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 27-50-00-866-008-A-01	Extension of the Flaps/Slats on the Ground
TASK 27-50-00-866-009-A-01	Retraction of the Flaps/Slats on the Ground
TASK 36-11-49-400-015-A	Installation of the Starter Valve Elbow-Duct and the Precooler Exchanger Tee-Duct in the Pylon
TASK 36-12-00-860-001-A	Pressurization of the Bleed System with the APU
TASK 36-12-00-860-002-A	Pressurization of the Bleed System through the HP Ground Connector
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
TASK 52-42-16-000-001-A	Removal of the HP Air-Ground Connector Door
TASK 52-42-16-400-001-A	Installation of the HP Air-Ground Connector Door
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-010-802-A	Opening of the Thrust Reverser Halves (Alternate Procedure)
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
TASK 78-32-00-410-802-A	Closing of the Thrust Reverser Halves (Alternate Procedure)
Diffuser

3. Job Set-up
Subtask 36-11-49-860-137-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that engine 1(2) is shutdown for a minimum of 5 minutes before you do this procedure.
(3) In the cockpit, on the AIR COND section of panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (the OFF legend is on).
(b) Make sure that the APU BLEED pushbutton switch is released (the ON legend is off).
(c) Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to operate the pneumatic system.
(4) In the cockpit, on the ENG section of panel 115VU:
(a) Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to start engine 1(2).
(5) Make sure that access door 191DB is open (Ref. AMM TASK 52-42-16-000-001).
(6) On the section of the HP ground connector:
(a) Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to pressurize the pneumatic system.
(7) Make sure that the slats/flaps are fully retracted (Ref. AMM TASK 27-50-00-866-009).
(8) Make sure that the slat/flap control-lever locking tool is installed (Ref. AMM TASK 27-00-00-480-002).
(9) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton-switch is off.
(b) Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to energize FADEC 1(2).

Subtask 36-11-49-010-302-A ** ON A/C NOT FOR ALL

B. Get Access

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

(1) Put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area.
(2) Make sure that an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position above the pylon.
(3) Make sure that these access panels are removed:

For the left pylon: 413BL and 413BR.
For the right pylon: 423BL and 423BR.

(4) Make sure that the fan cowls are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL and 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL and 448AR.

Subtask 36-11-49-040-184-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser
(1) Make sure that the thrust reverser is unserviceable for maintenance (Ref. AMM TASK 78-30-00-040-012).
(2) To get access to the bolts (2) and the washers (1):

Diffuser ** ON A/C NOT FOR ALL

(a) Make sure that the thrust reverser cowl door is open (Ref. AMM TASK 78-32-00-010-010) (Ref. AMM TASK 78-32-00-010-802).
(b) Make sure that an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below engine 1(2).

Subtask 36-11-49-865-242-A ** ON A/C NOT FOR ALL

D. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

4. Procedure
Subtask 36-11-49-420-165-A ** ON A/C NOT FOR ALL

A. Installation of the Diffuser
(1) If you use the APU to energize the electrical circuits, stop the APU:

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

(2) In the cockpit, on the SD bleed page:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: DO NOT TOUCH THE UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

(3) Use a SCRAPER - NON METALLIC to remove the remaining sealant from the plate of the diffuser (3).
(4) Apply a thin layer of Polysulfide Sealant-Low Density Multi Purpose Fillet - (Material No.06ACB1) to fill the space between the diffuser (3) and the metallic plate on the pylon.
(5) Install the diffuser (3).
(6) Install the washers (1) and the bolts (2).
(7) Tighten the bolts (2).
(8) Install the precooler exchanger tee-duct in the pylon (Ref. AMM TASK 36-11-49-400-015).

Subtask 36-11-49-710-066-A ** ON A/C NOT FOR ALL

B. Test(s)
(1) Pressurize the bleed system through the HP ground connector (Ref. AMM TASK 36-12-00-860-002) or with the APU (Ref. AMM TASK 36-12-00-860-001).
(a) Make sure that there are no leaks:

At the junction between the diffuser and the pylon.
At the junction of the precooler exchanger tee-duct.

5. Close-up
Subtask 36-11-49-865-243-A ** ON A/C NOT FOR ALL

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-49-410-227-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE.
(3) Close the thrust reverser cowl-door (Ref. AMM TASK 78-32-00-410-010) (Ref. AMM TASK 78-32-00-410-802).
(4) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL and 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL and 448AR.
(5) Install these access panels:

For the left pylon: 413BL and 413BR.
For the right pylon: 423BL and 423BR.

(6) Remove ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE.
(7) Close access door 191DB (Ref. AMM TASK 52-42-16-400-001).
(8) Remove the WARNING NOTICE(S).

Subtask 36-11-49-440-132-A ** ON A/C NOT FOR ALL

C. Reactivation of the Thrust Reverser
(1) Make the thrust reverser serviceable after reverser maintenance (Ref. AMM TASK 78-30-00-440-012).

Subtask 36-11-49-869-108-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Remove the slats/flaps control-lever locking tool (Ref. AMM TASK 27-00-00-080-002).
(2) Fully extend the slats/flaps (Ref. AMM TASK 27-50-00-866-008).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002) or (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 01:11:19 UTC