Removal of the Air Intake Diffuser and Elbow (131-9(A))

TASK 49-16-45-000-003-A
Removal of the Air Intake Diffuser and Elbow (131-9(A))

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

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 4M (13 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 52-41-00-010-001-A	Open the APU Doors for Access
Air Intake Diffuser and Elbow

3. Job Set-up
Subtask 49-16-45-860-056-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) On the panel 25VU, make sure that the APU MASTER SW p/bsw is set to the OFF position.
(3) Put a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-16-45-865-056-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-16-45-010-054-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the APU compartment.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT SW 11LJ to the ON position.

4. Procedure

WARNING: AFTER THE DIFFUSER IS REMOVED, CAREFULLY SUPPORT THE UNIT/ASSEMBLY BEFORE YOU CLOSE THE APU DOOR. IF YOU DO NOT SUPPORT THE UNIT/ASSEMBLY, IT CAN FALL AND BECOME DAMAGED, OR CAUSE INJURY TO PERSONNEL AND DAMAGE TO THE AIRCRAFT.

Subtask 49-16-45-020-054-A ** ON A/C NOT FOR ALL

A. Removal of the Air Intake Diffuser and Elbow

Air Intake Diffuser and Elbow ** ON A/C NOT FOR ALL

(1) Remove the screw (19), the washer (18) and disconnect the bonding strap (17).
(2) Disconnect the drain hoses (16) from the drain lines.
(3) Hold the diffuser (20) and elbow assembly (26).
(4) Remove and discard the cotter pin (25).
(5) Remove the castle nut (24), the washer (23) and the bolt (21). Move the tie-rod (22) out of the diffuser (20) and elbow assembly (26).
(6) Remove and discard the cotter pin (11).
(7) Remove the castle nut (12), the washer (10) and the bolt (15).
(8) Push the diffuser (20) and elbow assembly (26) rearwards and remove it from the fitting (9).

[Rev.10 from 2021] 2026.04.01 12:41:47 UTC