Aircraft Fuel Systems (Aerospace Series (PEP)) by Roy Langton, Chuck Clark, Martin Hewitt, Lonnie Richards

By Roy Langton, Chuck Clark, Martin Hewitt, Lonnie Richards

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The aircraft fuel system is one of the most interactive systems in modern aircraft today. It is critical, therefore, that the development phase provide the maximum possible exposure of the fuel system components and operational software to detect, isolate and correct systemlevel functional issues well before the system is exposed to the actual aircraft. Testing and certification issues are also covered in detail in Chapter 11. 3 Fuel System Examples and Future Technologies The penultimate chapter contains several real world examples of aircraft fuel systems all of which are concerning commercial (civil) aircraft applications because of the security constraints imposed by the military aircraft community.

Pilot valve: A float operated valve that controls the state of a separately located valve. The float may be positioned to sense a high or low fuel level condition Introduction 17 Pre-check: This is the process of verifying the integrity of the refuel shut-off system by simulating a full tank condition via fluidic or electrical means prior to actually reaching the full tank condition. g. a feed tank or collector tank). Scavenged fuel would otherwise be trapped and/or unusable. Sensing level: The level at which the pilot valve is set to operate by closing the pilot valve.

The opposite is true for the statically unstable aircraft. Here for steady level flight a pitchdown trim is required in steady state level flight because the weight acts behind the lift force. Now if a pitch-up disturbance takes place the increase in lift from the wing tends to increase pitch attitude further which is clearly destabilizing. It is important therefore, to ensure that the fuel system must not have potential failure modes that would cause an unstable aircraft CG location. This is important in many of today’s aircraft designs with aft located fuel tanks for minimization of trim drag in cruise.

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