AVTC3461 Lab 6 HU25 SP17 Turbine Fuel System
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AVTC 3641 CARBS & FUEL SYSTEMS
NAME
Keyu Yang
LAB PROJECT #6
Crew Number _______ Lab section
__
SUBJECT:
HU-25A Fuel System Familiarization
PURPOSE:
To familiarize the student with the operation of a typical jet fuel system and allow
them to see the results of operating the various components and controls.
They
will also have an opportunity to troubleshoot various problems in the system.
MATERIAL:
HU-25A Fuel System Manual, HU-25A Training Board, HU-25A Training
Board Checklist, Library References, Internet, and Airframe text chapter 8.
RESEARCH:
1.
What type of airplane is a HU-25A?
(NOTE: This may require you to perform an
internet search)
Dassault Guardian HU-25 Jet is a
fixed wing aircraft.
2.
How many fuel tanks (including feeder tanks) does this airplane have?
15
3.
Explain what the purpose of a feeder tank and how the feeder tanks operate in this
airplane?
Feeder tank feed the fuel to the engine, they get fuel through wing tanks.
4.
What is the total quantity of the fuel system on this aircraft?
1534 US gallon
5.
What type of tanks are the feeder and auxiliary tanks?
Bladder type.
Lab 6,
HU-25A Fuel System Familiarization,
1
6.
Explain how fuel quantity is measured in this system?
Describe the system in detail
including number of probes, operating voltages, and testing methods.
7.
What indication is there in the event of a low feeder tank fuel level?
What redundancy is
incorporated into the system in case of an electrical problem?
There is a low level light on the caution advisory panel. The system is powered by
two buses, protection is made by circuit breakers.
8.
What pressures are the fuel tanks maintained at and why?
3.6 psi for wing and auxiliary tanks, 1.4 psi for feeder tank to ensure fuel transfer to
the feeder tanks in event of normal transfer pump failure.
9.
What provisions are included in the system to prevent possible over pressurization?
Through what does this provision vent/drain overboard?
There is a negative pressure relief valve in each wing at rib 16.
10. Explain how the pressurization system operates?
Is it controlled automatically or
manually?
The fuel tanks are pressurized by filtered bleed air tapped from each engine
outboard LP bleed port. It is automatic.
11. What tanks can the auxiliary fuel tank feed?
It feeds the wing tanks.
12. What fuel level is maintained in the feeder tank with the float switch in:
LO? 430 lbs
HI? 730 lbs
Lab 6,
HU-25A Fuel System Familiarization,
2
13. Explain the purpose of the interconnect valves?
T
hey are operated to correct fuel imbalance between the wing tanks and, in
conjunction with the auxiliary fuel distribution valve, to transfer auxiliary tank
fuel to the wing tanks.
14. When will the caution advisory panel illuminate the L FUEL PRESS warning?
W
hen boost pump pressure falls below 6 psi.
15. Can both engines be run off of one boost pump/tank?
Explain why or why not?
Yes, because there is the crossfeed system.
16. On separate sheets, sketch a simple schematic to show the different fuel flows possible
through the system.
Lab 6,
HU-25A Fuel System Familiarization,
3
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17. What methods of refueling can be used on this aircraft?
Gravity refueling and pressure refueling.
18. Where is the single point refueling receptacle found on this aircraft?
It is on the out board mid-wing tanks.
19. Describe in detail the process of refueling this aircraft.
Be sure to describe the various
switches and their function.
Park the aircraft in a level position, fill the wing tanks and the feeder tanks can also
be refueled by operating the transfer pump. During this operation, the feeder tank
level select switch is set to the desired refuel level. When feeder tanks refueling is
complete, the wing tanks can be topped off.
20. List ALL the refueling safety devices incorporated into this aircraft.
The
door installation includes a micro-switch safety circuit connected in series with
the refueling panel access door. Refuel select switch. The access door covering the
panel. Flow restrictions. Amber wing-tank-full indicators.
PROCEDURE:
Using the HU-25A Fuel System Training Board in the lab, simulate the following scenarios.
Describe the results below each scenario.
Return all controls to their NORMAL operation
after each scenario.
a. Normal Operation in Flight (vary the fuel levels and note the changes in the system)
b. Crossfeed Operation (simulate with one boost pump OFF)
c. Engine Fire (either side; pull fire handle)
d. Single Point Refueling Operation (be sure to set switches on side of board to simulate
refueling operation)
Ask your instructor for a quiz over the material in this assignment.
Instructor Signoff
________
Lab 6,
HU-25A Fuel System Familiarization,
4
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