Page 155 - Aeronautical Engineer Data Book

128 Aeronautical Engineer’s Data Book
Table 8.3 Continued
Digital Electronic Engine Control (DEEC)
The computer that automatically controls all the
subsystems of the engine.
Electronic Engine Control (EEC)
Also known as the FADEC (full-authority digital
electronic engine control), it is an advanced computer
which controls engine functions.
Engine Build Unit (EBU)
The equipment supplied by the aircraft manufacturer that
is attached to the basic engine, e.g. ducting, wiring
packages, electrical and hydraulic pumps and mounting
parts.
Engine Pressure Ratio (EPR)
The ratio of the pressure of the engine air at the rear of
the turbine section compared to the pressure of the air
entering the compressor.
Exhaust Gas Temperature (EGT)
The temperature of the engine’s gas stream at the rear of
the turbine stages.
Fan
The large disc of blades at the front of a turbofan engine.
In-flight Shutdown Rate (IFSD)
A measure of the reliability of an engine, expressed as
the number of times per thousand flight hours an engine
must be shut down in flight.
Inlet duct
The large round structure at the front of an engine where
the air enters.
Line Replaceable Unit (LRU)
An engine component that can be replaced ‘in service’ at
an airport.
Mean Time Between Failures (MTBF)
The time that a part or component operates without
failure.
Nacelle
The cylindrical structure that surrounds an engine on an
aircraft. It contains the engine and thrust reverser and
other mechanical components that operate the aircraft
systems.
N1 (rpm)
The rotational speed of the engine’s low pressure
compressor and low pressure turbine stage.
N2 (rpm)
The rotational speed of the engine’s high pressure
compressor.