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Common forms of energy are: chemical, electrical, light, and heat. We are able to convert energy
between these different forms, but can neither create nor destroy energy.
engineered performance standards. See EPS.
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engine gage unit (reciprocating engine instrument). A single panel-mounted instrument case that
contains three engine instruments. An oil pressure gage, oil temperature gage, and fuel pressure gage are
mounted in the same case so the pilot can see at a glance these vital engine conditions.
Some engine gage units have a cylinder head temperature gage in place of the fuel pressure gage.
engine logbook (aircraft record). A record book in which all the operating time, maintenance that has
been performed, and the inspection status of an aircraft engine are recorded.
engine mount. The part of an aircraft structure designed to support the engine. Vibration isolators are
normally included as part of the engine mount assembly.
engine nacelle (aircraft structure). The compartment on a multiengine aircraft in which the engine is
mounted. The engine nacelle for a turbojet engine that mounts on the fuselage or below the wing is often
called an engine pod.
engine pressure ratio. See EPR.
engine stations (gas turbine engine). A method of identifying various locations in a gas turbine engine for
ease of describing pressures and temperatures. Station designations are different for different types of
turbine engines, and stations can be subdivided using decimal numbers. The following station designations
are used for a typical dual-rotor turbofan engine:
Station Location
AM Ambient conditions ahead of the engine
1---------------- Tip of nose cone
2---------------- Fan or low-pressure compressor inlet
3---------------- High-pressure compressor inlet
4---------------- Combustor inlet
5---------------- High-pressure turbine inlet
6---------------- Low-pressure turbine inlet
7---------------- Turbine discharge
8---------------- Turbine duct discharge
9---------------- Exhaust nozzle discharge
engine trimming (gas turbine engine operation). A maintenance procedure in which a turbine engine fuel
control is adjusted. The idling speed and the high-end performance are adjusted to cause the engine to
produce the required EGT or EPR at the RPM specified by the engine manufacturer.
enrich (fuel metering term). To make a fuel-air mixture richer. The fuel-air mixture ratio may be adjusted
to vary the amount of fuel mixed with the air used in the engine. When the amount of fuel metered into the
engine is increased without increasing the air, the mixture is enriched.
enroute air traffic control services. Air traffic control service provided for aircraft operating on IFR flight
plans between departure and terminal areas. This service is normally provided by the air route traffic
control centers (ARTCC).
enroute automated radar tracking system. See EARTS.
enroute descent (flight operations). Descent from enroute cruising altitude which takes place along the
route of flight.
enroute flight advisory service (EFAS). This service, also known as flight watch, is designed to provide,
upon pilot request, timely weather information pertaining to the type of flight, intended route of flight, and
altitude.
enroute high-altitude charts. Aeronautical charts for enroute instrument navigation (IFR) in the
high-altitude stratum. Information includes the portrayal of jet routes, identification and frequencies of
radio aids, selected airports, distances, time zones, special use airspace, and related information.
enroute low-altitude charts. Aeronautical charts for enroute instrument navigation (IFR) in the
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low-altitude stratum. Information includes the portrayal of airways, limits of controlled airspace, position
identification and frequencies of radio aids, selected airports, minimum en route and minimum obstruction
clearance altitudes, airway distances, reporting points, restricted areas, and related data.
enroute minimum safe altitude warning. See EMSAW.
entrained air. Air trapped in a liquid, forming an emulsion with it. When lubricating oil passes through an
engine, it picks up large quantities of air, and this entrained air increases the volume of the oil, making it
less effective as a lubricant.
Entrained air must be removed from the oil by a deaerator system, an air-oil separator, before it is
sent back through the engine.
entrained water. Water held in suspension in the fuel carried in an aircraft fuel tank. Entrained water does
not cause many problems on airplanes powered with reciprocating engines, but it does cause serious
　
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