Visual Check of Fuel Distribution System for Condition and Security (APS 3200)

TASK 49-32-00-200-002-A
Visual Check of Fuel Distribution 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 NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)
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 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 52-41-00-010-001-A	Open the APU Doors for Access
Fuel Control System

3. Job Set-up
Subtask 49-32-00-860-050-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 49-32-00-865-052-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 49-32-00-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) below the APU access doors.
(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 switch 11LJ on.

4. Procedure
Subtask 49-32-00-790-050-A ** ON A/C NOT FOR ALL

A. Visual Check of the APU Fuel Distribution Sytem for Condition and Security
(1) APU Fuel Pipes.
(a) Examine the fuel pipe between the Fuel Control Unit (FCU) and the Flow Divider for damage and signs of leakage.
(b) Examine the supply and return lines from the pressure regulator of the FCU to the servo valves of the IGV and BCV for damage and signs of leakage.
(c) Examine the fuel pipes from the Flow Divider to the Pilot Fuel and Main Fuel Manifold for damage and signs of leakage.
(d) Examine the Fuel Drain Pipes from the:

flow divider to the Exhaust System
Combustion-Chamber Drain Valve to the APU Drain Collector
FCU (pump shaft seal) to the APU Drain Collector
BCV (actuator seal) to the APU Drain Collector
IGV (actuator seal) to the APU Drain Collector

for damage and signs of leakage.
(2) Fuel Control Unit.
(a) Examine all fuel line connections at the FCU for correct attachment and signs of leakage.
(b) Examine the filter housing for correct attachment, damage and signs of leakage.
(c) Examine the electrical connectors of the FCU for correct attachment and signs of damage.
(3) IGV and BCV Actuator Assembly.
(a) Examine the fuel line connections at the actuators for damage and signs of leakage.
(4) Fuel Flow Divider.
(a) Examine all fuel line connections for correct attachment and signs of leakage.
(5) Drain Valve Assembly.
(a) Examine all line connections for correct attachment and signs of leakage.
(6) Fuel Manifolds and Injectors.
(a) Examine the fuel Injectors for correct attachment and signs of leakage.
(b) Examine the fuel manifolds for correct attachment, damage and signs of leakage.

5. Close-up
Subtask 49-32-00-410-051-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 315AL 316AR.
(4) Remove the access platform.

Subtask 49-32-00-865-053-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 49-32-00-860-051-A ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial 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 01:29:44 UTC