General Visual Inspection of the APU Air Inlet Plenum and APU Air Intake (APS 3200)

TASK 49-16-00-210-805-A
General Visual Inspection of the APU Air Inlet Plenum and APU Air Intake (APS 3200)

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

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

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

ZONE: 310

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	1	HOT WATER PRESSURE WASHER
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SPRAY - BOTTLE
No specific	1	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08AJA9)	Aqueous Cleaner-Turbine Engine Gas Path - Legacy

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
315AL, 316AR

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 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
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 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
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
TASK 52-41-00-410-001-A	Close the APU Doors after Access

3. Job Set-up
Subtask 49-16-00-860-091-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On panel 25VU, push the APU MASTER SW pushbutton switch, then make sure that the APU air-intake flap moves to the fully open position.
(3) Put a WARNING NOTICE(S) in position 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 49-16-00-865-122-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 49-16-00-010-081-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 49-16-00-210-061-A ** ON A/C NOT FOR ALL

A. Inspection and Cleaning of the APU Inlet Plenum
(1) Do a visual inspection of the APU inlet plenum for dirt, debris, dust, sand, oil, combustible residues, grease, fungus growth and/or other contamination.

Make sure that the APU inlet plenum is dry and clean.
If you find contamination, do the procedure that follows:

(a) Clean the APU inlet plenum internally and all the sound attenuator baffles.

Apply Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) mixed with clean drinking water with a SPRAY - BOTTLE with a pressure between 2 bar (29.0075 psi) and 3 bar (43.5113 psi) on:
. The inner walls of the installed inlet plenum
. The sound attenuator baffles.

(b) Let the mixture stay on the surfaces for 20 minutes to complete the cleaning procedure.
(c) Prepare a HOT WATER PRESSURE WASHER with a maximum pressure of 3 bar (43.5113 psi) and a maximum temperature of 130 deg.C (266.00 deg.F).
(d) Flush the cleaning solution from the surface of the inspection area with a HOT WATER PRESSURE WASHER. Do not point the HOT WATER PRESSURE WASHER to the external components of the APU.
(e) Examine the surfaces after the cleaning procedure.
(f) Let the inspection area dry for 15 minutes.

5. Close-up
Subtask 49-16-00-410-084-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set the LIGHT control switch 11LJ to the OFF position.
(3) Close APU access doors 316AR and 315AL (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).

Subtask 49-16-00-865-123-A ** ON A/C NOT FOR ALL

B. 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
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-16-00-860-092-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On panel 25VU, push the APU MASTER SW pushbutton switch and make sure that the APU air-intake flap moves to the fully closed position.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Put the aircraft back to its initial configuration.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:41:59 UTC