Inspection of the Magnetic Drain Plug (APS 3200)

TASK 49-91-42-200-003-A
Inspection of the Magnetic Drain Plug (APS 3200)

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

WARNING: MAKE SURE THAT THE CORRECT FIRE FIGHTING/EXTINGUISHING EQUIPMENT AND THE APPROVED PERSONNEL ARE AVAILABLE. THE APU FIRE EXTINGUISHING SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF ACCESS DOORS 315AL AND 316AR ARE OPEN OR REMOVED.

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

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	LIGHT SOURCE - WHITE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
98L12003001000	AR	HARNESS,SAFETY

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(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 24-41-00-861-002-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 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-11-11-000-003-A	Removal of the Power Plant (APU) (APS 3200)
TASK 49-11-11-400-003-A	Installation of the Power Plant (APU) (APS 3200)
TASK 49-90-00-600-005-A	Oil Change (Drain Procedure) (APS 3200)
TASK 49-90-00-600-005-A-01	Oil Change (Top-Off Procedure) (APS 3200)
TASK 49-90-00-600-005-A-02	Brand/Type Oil Change (Flush Procedure) (APS 3200)
TASK 49-91-41-920-001-A	Discard Pressure Oil-Filter Element (APS 3200)
TASK 49-91-41-920-002-A	Replace AC-Generator Scavenge Filter-Element (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
Magnetic Drain Plug Inspection
Magnetic Drain Plug Inspection

3. Job Set-up
Subtask 49-91-42-860-053-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 the overhead panel 25VU, make sure that the APU MASTER SW pushbutton switch is released (ON legend is off).
(3) On the APU section of overhead panel 25VU, put a WARNING NOTICE(S) 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 49-91-42-865-058-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 49-91-42-010-053-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 an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the 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

WARNING: USE THE CORRECT PERSONAL PROTECTION. OIL CAN HAVE ADDITIVE CALLED TRICRESYL PHOSPHATE IN IT. THIS CHEMICAL IS AN ASPHYXIANT, IT IS POISONOUS AND CAN BE ABSORBED THROUGH THE SKIN. USE CARE WHEN ENGINE OIL IS DRAINED. HOT OIL CAN POSSIBLY CAUSE BAD BURNS.

Subtask 49-91-42-240-050-A ** ON A/C NOT FOR ALL

A. Inspection of the Magnetic Drain Plug
(1) Remove the magnetic element (1) from the drain plug (2).
(2) Do an inspection of the magnetic element (1) under a LIGHT SOURCE - WHITE for metal particles.
(a) A small quantity of metal particles not larger than 1.50 mm (0.0591 in.) in any dimension is permitted. In this case install the magnetic element (1) in the drain plug (2).
(b) If you find a large quantity of metal particles smaller than 1.50 mm (0.0591 in.), do the following steps:

CAUTION: DO NOT CLEAN THE OIL FILTER ELEMENTS. YOU MUST DISCARD THEM AND INSTALL NEW FILTER ELEMENTS. IF YOU CLEAN THE OIL FILTER ELEMENTS, YOU CAN CAUSE DAMAGE TO THEM. THIS WILL CAUSE DAMAGE TO THE APU.

1 Clean the magnetic element (1) in the Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
2 Dry the magnetic element (1) with a clean Textile-Lint free Cotton - (Material No.14SBA1) .
3 Replace the oil filters (Ref. AMM TASK 49-91-41-920-002) and (Ref. AMM TASK 49-91-41-920-001).
4 Install the magnetic element (1) in the drain plug (2).
5 Do the servicing to change the oil in the APU oil reservoir (Ref. AMM TASK 49-90-00-600-005).
6 APU operation:
a Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
121VU...APU/APU/CTL...(2KD)...L42
121VU...APU/ECB/SPLY..(1KD)...L41
b Start the APU (Ref. AMM TASK 49-00-00-860-005) and operate it for 15 minutes.
c Do the APU shutdown procedure (Ref. AMM TASK 49-00-00-860-006).
d Open, safety and tag this(these) circuit breaker(s):
121VU...APU/APU/CTL...(2KD)...L42
121VU...APU/ECB/SPLY..(1KD)...L41

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

7 Remove the magnetic element (1) from the drain plug (2).
8 Remove the oil filters for inspection (Ref. AMM TASK 49-91-41-920-001) and (Ref. AMM TASK 49-91-41-920-002).
9 Do an inspection of the magnetic element (1) and the oil filter elements under a source of white light for metal particles.
a If you find any metal particles on the magnetic element or the oil filter elements:

Install the magnetic element (1) in the drain plug (2).
Install the oil filters (Ref. AMM TASK 49-91-41-920-001) and (Ref. AMM TASK 49-91-41-920-002).
Replace the APU (Ref. AMM TASK 49-11-11-000-003) and (Ref. AMM TASK 49-11-11-400-003).

b If you do not find any metal particles on the magnetic element (1) or in the oil filter elements :

Install the oil filters (Ref. AMM TASK 49-91-41-920-001) and (Ref. AMM TASK 49-91-41-920-002).
Install the magnetic element (1) in the drain plug (2).

NOTE: Make entries in the logbook:

that a check for metal particles was made, and what the result of the check was.

(c) If you find metal particles larger than 1.50 mm (0.0591 in.):
1 Install the magnetic element (1) in the drain plug (2).
2 Replace the APU (Ref. AMM TASK 49-11-11-000-003) and (Ref. AMM TASK 49-11-11-400-003).

5. Close-up
Subtask 49-91-42-410-053-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) Close APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(3) Remove the access platform(s).
(4) Remove the safety harness.

Subtask 49-91-42-865-059-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 49-91-42-860-054-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Put the related hydraulic system in the pressurized configuration (Ref. AMM TASK 29-00-00-864-001).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:33:17 UTC