energy. The capacity for performing work. Something that changes, or tries to change, matter. There are two basic types of energy: potential, or stored energy, and kinetic energy, associated with motion.
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.
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).
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