Removal of the Fuel Control Unit (APS 3200)

TASK 49-32-11-000-002-A
Removal of the Fuel Control Unit (APS 3200)

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

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

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	CAP - BLANKING
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	1	PICK UP TOOL - MAGNETIC
No specific	AR	PLUG - BLANKING
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 28-00-00-910-001-A	Fuel Safety Procedures
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
Fuel Control Unit

3. Job Set-up
Subtask 49-32-11-941-057-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Obey the Fuel Safety Procedures (Ref. AMM TASK 28-00-00-910-001).
(2) On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Put a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that ground fire extinguishing equipment is available.
(5) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-32-11-865-058-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 49-32-11-010-054-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).

4. Procedure
Subtask 49-32-11-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Fuel Control Unit

CAUTION: PUT PLASTIC CAPS OR PLUGS ON ALL FUEL AND/OR LUBRICATION SYSTEM COMPONENTS AND LINES. IF YOU USE TAPE, CLOTH, OR METAL CAPS ON THEM, YOU CAN DAMAGE THE APU.

CAUTION: YOU MUST USE TWO WRENCHES AND HOLD THE COMPONENT WHEN YOU REMOVE/INSTALL THE PIPE COUPLINGS AND/OR UNIONS. THIS PREVENTS DAMAGE TO THE COMPONENT.

(1) Disconnect the electrical connector P19 (1) from the fuel control unit (12).
(2) Remove the nuts (11), the washers (10), the bolts (8) and harness clamps (9) from the fuel control unit (12).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Put a CONTAINER 5 L (1.32 USGAL) under the fuel inlet.
(5) Remove connector (2).
(6) Remove the pressure switch (4).
(7) Remove the union (5) from the FCU (12).
(8) Remove and discard the packings (3).
(9) Make sure that the container is in position.
(10) Disconnect the tubes (6), (13) and (15) from the FCU (12).
(11) Put the PLUG-BLANKING in each disconnected line end.
(12) Hold the FCU and remove the V-band clamp (20) .
(13) Remove the FCU (12).
(14) Remove and discard the packings (18) and (19).

Subtask 49-32-11-210-055-A ** ON A/C NOT FOR ALL

B. General Visual Inspection of the FCU shaft
(1) Examine the FCU shaft.
(a) If the FCU shaft is broken:

NOTE: If the FCU shaft is broken, a new FCU will be installed.

1 Examine the inner spline area. The broken shaft can fall in.
a If you find it, remove the broken shaft from the inner spline area.

Insert a PICK UP TOOL - MAGNETIC into the gearshaft to remove the broken shaft.

2 If the broken shaft falls into the hollow diameter of the FCU drive gearshaft:

Insert a PICK UP TOOL - MAGNETIC to remove the broken shaft.
Rotate the PICK UP TOOL - MAGNETIC to align the spline teeth with the gearshaft spline and pull it out slowly.

(b) If you find a sheared spline:
1 Remove the debris from the gearbox with a PICK UP TOOL - MAGNETIC.

NOTE: The magnetic pick up tool needs to be 4.76 mm or smaller to fit inside the FCU drive gearshaft.

[Rev.10 from 2021] 2026.04.01 01:29:48 UTC