Detailed Inspection of APU Suspension Rods, Vibration Isolator Structure including Brackets and visible part of Structure Attachment Fittings (APS 3200)

TASK 49-12-00-210-004-A
Detailed Inspection of APU Suspension Rods, Vibration Isolator Structure including Brackets and visible part of Structure Attachment Fittings (APS 3200)

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

ZONE: 315

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 3M (10 FT)- ADJUSTABLE
No specific	AR	BRUSH - BRISTLED, STIFF
No specific	AR	LIGHT SOURCE - WHITE
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)

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
315	TAIL CONE APU AND ACCESSORY COMPARTMENT
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 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 49-12-51-000-002-A	Removal of the FWD LH Tie-Rods and Vibration Isolator (APS 3200)
TASK 49-12-51-400-002-A	Installation of the FWD LH Tie-Rods and Vibration Isolator (APS 3200)
TASK 49-12-52-000-002-A	Removal of the FWD RH Tie-Rods and Vibration Isolator (APS 3200)
TASK 49-12-52-400-002-A	Installation of the FWD RH Tie-Rods and Vibration Isolator (APS 3200)
TASK 49-12-53-000-002-A	Removal of the AFT Tie-Rod and Vibration Isolator (APS 3200)
TASK 49-12-53-400-002-A	Installation of the AFT Tie-Rod and Vibration Isolator (APS 3200)
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
APU Mounts

3. Job Set-up
Subtask 49-12-00-860-056-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 24-41-00-861-002).
(3) Make sure that the hydraulic systems are depressurized (Ref. AMM TASK 29-10-00-864-001), (Ref. AMM TASK 29-10-00-864-002) and (Ref. AMM TASK 29-10-00-864-003).

Subtask 49-12-00-865-058-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 49-12-00-010-054-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR and safety them in the open position (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT control switch 11LJ to the ON position.

4. Procedure
Subtask 49-12-00-110-053-A ** ON A/C NOT FOR ALL

A. Cleaning

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.

(1) Clean the vibration isolators and the tie-rods with a Textile-Lint free Cotton - (Material No.14SBA1) and Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .

NOTE: 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 transfer of contamination.

(a) 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 lint free cloth frequently to make sure dirt is not put back on the surfaces.
(b) Use a BRUSH - BRISTLED, STIFF to clean any holes, corners and edges.
(2) When the surfaces are clean, flush 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 dry, filtered compressed air at a maximum pressure of 1.4 bar (20 psi).

Subtask 49-12-00-210-059-A ** ON A/C NOT FOR ALL

B. Visual Inspection of the APU Suspension
(1) Inspection of the tie-rods and bonding straps.
(a) Examine the tie-rods (3) for damage (scratches and cracks) and corrosion under a LIGHT SOURCE - WHITE.
1 If you are not sure if a component has cracks, do a crack detection test with a dye penetrant.
(b) Make sure that the tie-rods and the tie-rod attachments are not bent.
1 Do the check with 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.
(c) Make sure that the nuts of the bolts (1) are in the correct condition. Make sure that the nuts of the bolts (1) are safetied with cotter pins.
(d) Make sure that the nuts (2) are safetied with the lockwashers.
(e) Examine the bonding straps (8) for correct attachment and condition.
1 If a component is not in the 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).

(2) Inspection of the vibration isolators, coverplates and APU mount brackets.
(a) Examine the vibration isolators (4), coverplates (9) and the APU mount brackets (7) for damage and corrosion under a source of white light.
1 If you are not sure if a component has cracks, do a crack detection test with a dye penetrant.
(b) Visually examine the vibration isolator self-lock nuts (5), make sure that the red varnish torque position marks are in line.
(c) Make sure that bolts (6) of the APU mount brackets (7) are safetied with lockwire and that the lockwire is in correct condition.
(3) Examine the structural brackets for damage and corrosion under a source of white light.
(a) If you are not sure if a component has cracks, do a crack detection test with a dye penetrant.

5. Close-up
Subtask 49-12-00-410-054-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 off.
(3) Close the APU access doors 316AR 315AL (Ref. AMM TASK 52-41-00-410-001) .
(4) Remove the access platform(s).

Subtask 49-12-00-865-059-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 49-12-00-860-057-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration.
(1) De-energize the ground service network (Ref. AMM TASK 24-41-00-862-002)
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 01:26:55 UTC