Removal of the Air Intake Duct (131-9(A))

TASK 49-16-42-000-003-A
Removal of the Air Intake Duct (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 49-16-43-000-003-A	Removal of the Air Intake Flap (131-9(A))
TASK 49-16-44-000-003-A	Removal of the Air Intake Nose (131-9(A))
TASK 52-41-00-010-001-A	Open the APU Doors for Access
TASK 52-41-23-010-801-A	Opening of Access Door 314AR
Air Inlet Duct

3. Job Set-up
Subtask 49-16-42-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Put the warning notices on panel 25VU to tell persons not to start the APU.
(2) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(3) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-16-42-865-056-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 49-16-42-010-052-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 control switch 11LJ to the ON position.
(4) Open access door 314AR and safety it in the open position.
(Ref. AMM TASK 52-41-23-010-801).

4. Procedure
Subtask 49-16-42-020-053-A ** ON A/C NOT FOR ALL

A. Removal of the Air Intake Duct
(1) Remove the air intake flap (Ref. AMM TASK 49-16-43-000-003).
(2) Remove the air intake nose (Ref. AMM TASK 49-16-44-000-003).
(3) Remove the screws (2) and the seal assembly from the air intake duct (1).
(4) Remove the nuts (10), the washers (11), the distance washers (16) and the bolts (13).
(5) Remove the brackets (12) and the flexible seal (14) from the flange (15).
(6) Remove the bolts (9), the washers (8) and the screws (19).
(7) Remove the bolts (4) and the washers (3).
(8) Remove the nuts (5), the bolts (7) and the washers (6).
(9) Remove the top flange (17) and the bottom flange (18) from the air intake duct (1).
(10) Hold the air intake duct (1) and remove the bolts (21) and (22) and the washers (20) and (23).
(11) Remove the air intake duct (1).

[Rev.10 from 2021] 2026.04.01 01:27:52 UTC