General Visual Inspection of APU Suspension System for Condition and Security (APS 3200)

TASK 49-12-00-210-005-A
General Visual Inspection of APU Suspension System for Condition and Security (APS 3200)

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

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

1. Reason for the Job
Refer to the MPD TASK: 491200-A2
GENERAL VISUAL INSPECTION OF APU SUSPENSION SYSTEM FOR CONDITION AND SECURITY.
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	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY
No specific	AR	BRUSH - BRISTLED, STIFF
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	STRAIGHT EDGE 300 MM (12 IN)
No specific	1	STRAIGHT EDGE 500 MM (20 IN)
No specific	1	WARNING NOTICE(S)
98L12003001000	AR	HARNESS,SAFETY

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08ABC1)	Aqueous Cleaner-Aircraft Exterior Pressure Spraying -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied 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
TASK 52-41-00-410-001-A	Close the APU Doors after Access
TASK 49-12-51-000-002-A	Removal of the FWD LH Tie-Rods and Vibration Isolator (APS 3200) (for corrective action)
TASK 49-12-51-400-002-A	Installation of the FWD LH Tie-Rods and Vibration Isolator (APS 3200) (for corrective action)
TASK 49-12-52-000-002-A	Removal of the FWD RH Tie-Rods and Vibration Isolator (APS 3200) (for corrective action)
TASK 49-12-52-400-002-A	Installation of the FWD RH Tie-Rods and Vibration Isolator (APS 3200) (for corrective action)
TASK 49-12-53-000-002-A	Removal of the AFT Tie-Rod and Vibration Isolator (APS 3200) (for corrective action)
TASK 49-12-53-400-002-A	Installation of the AFT Tie-Rod and Vibration Isolator (APS 3200) (for corrective action)
TASK 49-12-54-000-002-A	Removal of the APU Mount Brackets (APS 3200) (for corrective action)
TASK 49-12-54-400-002-A	Installation of the APU Mount Brackets (APS 3200) (for corrective action)
APU Mounts

3. Job Set-up
Subtask 49-12-00-860-058-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 overhead panel 25VU, make sure that the APU MASTER SW pushbutton switch is released (the ON legend is off).
(3) On the APU section of overhead panel 25VU, make sure that the WARNING NOTICE(S) is in position 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 49-12-00-865-060-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 49-12-00-010-055-A ** ON A/C NOT FOR ALL

C. 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 the HARNESS, SAFETY before you start work in the work area.
(2) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below APU access doors 315AL and 316AR.
(3) Open APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001).
(4) Set the light switch 11LJ to the ON position.

4. Procedure
Subtask 49-12-00-110-054-A ** ON A/C NOT FOR ALL

A. Cleaning
(1) Do the steps that follow:

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

(a) Clean the vibration isolators (4) and the tie-rods (3) with a Textile-Lint free Cotton - (Material No.14SBA1) and the Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
(b) Apply the Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) to the cloth and not the cloth to the Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) . This will prevent the movement of contamination.
(c) Carefully clean a small area at a time and remove the Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) before it becomes dry. Use a new Textile-Lint free Cotton - (Material No.14SBA1) frequently to make sure that you do not put the contamination back on the surfaces.
(d) Use the BRUSH - BRISTLED, STIFF to clean all holes, corners and edges.
(2) When the surfaces are clean, flush them with clean water.

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.

(3) Dry the surfaces with the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY at a maximum pressure of 1.4 bar (20.31 psi).

Subtask 49-12-00-210-060-A ** ON A/C NOT FOR ALL

B. Visual Inspection

APU Mounts ** ON A/C NOT FOR ALL

(1) Visual inspection of the tie-rods and the bonding straps.
(a) Look that the nuts of the bolts (1) are safetied with cotter pins and that the cotter pins are in the correct condition.
(b) Look that the nuts (2) are safetied with the tags of the lockwashers.
(c) Examine the bonding straps (8) for correct attachment and condition.
(d) Examine the tie-rods (3) for damage and corrosion .
(e) Examine the tie-rod bearings for wear.
(f) Make sure that the tie-rods and the tie-rod attachments are not bent.
1 Do the check with the straight-edges to make sure that the tie-rods are not bent. On each tie-rod assembly, do two checks in an angle of 90 degrees apart:

On the tie-rods which hold the forward vibration isolators (4035KM and 4045KM), do the check with a STRAIGHT EDGE 500 MM (20 IN).
On the tie-rods which hold the aft vibration isolators (4055KM), do the check with a STRAIGHT EDGE 300 MM (12 IN).

2 Move the straight-edges along the tie-rods to check the full length.
(g) Make sure that the tie-rods and the tie-rod attachments are not broken.
1 If a component is not in correct condition, replace it.

FWD LH tie-rods and vibration isolators (Ref. AMM TASK 49-12-51-000-002) and (Ref. AMM TASK 49-12-51-400-002).
FWD RH tie-rods and vibration isolators (Ref. AMM TASK 49-12-52-000-002) and (Ref. AMM TASK 49-12-52-400-002).
AFT tie-rods and vibration isolators (Ref. AMM TASK 49-12-53-000-002) and (Ref. AMM TASK 49-12-53-400-002).

(h) Examine the holes of the tie-rod attachments for elongation.
(2) Inspection of the vibration isolators.
(a) Examine the self-locking nuts (5) of the vibration isolators (4) for correct installation.
(b) Make sure that the red varnish torque position marks are in line.
(c) Examine the vibration isolator (4) external surfaces for damage and corrosion.
1 If a component is not in correct condition, replace it.

FWD LH tie-rods and vibration isolators (Ref. AMM TASK 49-12-51-000-002) and (Ref. AMM TASK 49-12-51-400-002),
FWD RH tie-rods and vibration isolators (Ref. AMM TASK 49-12-52-000-002) and (Ref. AMM TASK 49-12-52-400-002),
AFT tie-rods and vibration isolators (Ref. AMM TASK 49-12-53-000-002) and (Ref. AMM TASK 49-12-53-400-002).

(3) Inspection of the Mount Brackets.
(a) Look that the bolts (6) of the APU mount brackets (7) are safetied with lockwire and the lockwire is in correct condition.
(b) Examine the mount brackets (7) external surfaces for damage and corrosion.
1 If a component is not in correct condition, replace it (Ref. AMM TASK 49-12-54-000-002) and (Ref. AMM TASK 49-12-54-400-002).
(4) Examine the structural brackets for damage and corrosion.

5. Close-up
Subtask 49-12-00-410-055-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 switch 11LJ to the OFF position.
(3) Close the APU access doors 316AR and 315AL (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).
(5) Remove the 98L12003001000 HARNESS,SAFETY.

Subtask 49-12-00-865-061-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 49-12-00-860-059-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration.
(1) Pressurize the aircraft hydraulic systems
(Ref. AMM TASK 29-00-00-864-001).
(2) Remove the WARNING NOTICE(S).
(3) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 01:26:56 UTC