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Bleed air containing a large amount of energy is taken from the turbine-engine compressor. This
hot air passes through a primary heat exchanger where it gives up some of its energy. It is then taken into a
compressor driven by the expansion turbine. Here its pressure and temperature are both increased. This air
then passes through a secondary heat exchanger where it gives up more of its energy and its temperature is
dropped. From here it flows into the expansion turbine that drives the compressor, using up much of its
remaining energy.
After leaving the turbine, it expands into the air conditioning ducts. Having lost most of its energy
through the heat exchangers and the expansion turbine, the air is now cold.
expansion wave (high-speed aerodynamics). The change in pressure and velocity of a supersonic flow of
air as it passes over a surface, which drops away from the flow. As the surface drops away, the air tries to
follow it. In changing its direction, the air speeds up to a higher supersonic velocity, and its static pressure
decreases.
There is no change in the total amount of energy as the air passes through an expansion wave, and
so there is no noise as there is when air passes through a shock wave.
“Expect (altitude) at (time) or (fix)” (air traffic control).
A portion of an instrument departure clearance, to provide a pilot with an altitude to be used in the
event of two-way radio communication failure.
“Expect departure clearance (time)” (air traffic control). The time an operator can expect a gate release.
This is used in the Fuel Advisory Departure (FAD) program.
“Expect further clearance (time)” (air traffic control). The time a pilot can expect to receive clearance
beyond a clearance limit.
“Expect further clearances via (airways, routes, or fixes)” (air traffic control). This phrase is used by
air traffic controllers to inform a pilot of the routing he may expect if any part of the route beyond a short
range clearance limit differs from that filed.
“Expedite” (air traffic control). A warning used by air traffic controllers when prompt compliance is
required in order to avoid the development of an imminent situation.
expendable parts (maintenance supply). Fast-moving consumable items, usually with a unit cost of
$50.00 or less. Expendable parts include nuts, bolts, gaskets, abrasives, and glues.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 233
expendable weight (aircraft operation). The part of an aircraft load that is used in flight. The fuel carried
in an aircraft is an expendable weight. It is used up as the flight progresses.
experimental license (aircraft certification). A license issued by the Federal Aviation Administration that
allows an aircraft to be flown for the purpose of proving its design and construction in order to qualify for a
regular license. The FAA puts certain restrictions on experimental aircraft. These restrictions apply to the
crew allowed to fly in the aircraft and where it can be flown.
explode. To make a violent change in the chemical composition of a material. Usually an explosion is
accompanied by a loud noise and the release of light and heat.
When a mixture of gasoline fumes and air in a closed container is ignited, it explodes. In the
explosion, the gasoline and air change into carbon dioxide and water and produce a loud noise, light, and
heat.
exploded-view drawing. A drawing showing all of the parts spread out to show their relative location in
the component.
explosion-proof motor (electric motor). An electric motor totally enclosed in a housing. Explosive gases
cannot get into the housing to explode, and sparks produced inside the housing cannot ignite gases on the
outside.
explosion-proof switch (electrical component). A special electrical switch enclosed in a housing that
prevents the sparks which occur when the contacts separate from igniting any explosive gases that may be
on the outside of the housing.
explosive atmosphere. Atmosphere (air) which holds explosive vapors or certain types of powder that can
be ignited. Dust and particles of powdered metal are easily ignited, and atmosphere which contains these
contaminants can become dangerously explosive.
explosive bolt. A special bolt with an explosive charge built into it. This is a remotely operated charge that
causes the bolt to fail and release its hold. Explosive bolts are used to allow stages of rockets to separate,
and to release droppable fuel tanks from an airplane.
explosive decompression (aircraft operation). A condition that can occur in a pressurized aircraft when
part of the structure fails and releases the pressure inside the cabin at an explosive rate.
　
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