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beacon used for final approach

Power output can be as little as 15 watts
for an ILS locator beacon.
IMIM abbreviation inner marker
image image /md"/ noun a reproduction of
the form of an object or person

Although difficult to see, the photograph
shows the image of the aircraft
with part of the fin missing. (NOTE: It
suggests that the image has no detail
and that it is the shape which is important.)
117 inactive
imaginary imaginary /|md"n(ə)ri/ adjective
not real
The equator is an imaginary
line around the earth.
IMC IMC abbreviation instrument meteorological
conditions
immediate immediate /|midiət/ adjective 1.
happening at once or instantly
Fire
extinguishers should be ready for immediate
use in the event of an emergency.
 in the immediate future in the very
near future 2. nearby, close at hand

The immediate area surrounding the
Earth is known as the atmosphere.
immerse immerse /|m%s/ verb to cover completely
in liquid, to submerge
Fuel is
pumped from the main tanks via fully
immersed booster pumps mounted on
the base of the fuel tank.
imminent imminent /mnənt/ adjective due to
happen in a very short time
The transmission
made it clear that the aircraft
was in imminent danger.
A message
from the flight deck informs cabin staff
that take-off is imminent.
impact impact /mpkt/ noun the striking of
one body against another, a collision 
on impact as soon as it hit something

One of the tyres burst on impact (with
the ground).
Super-cooled water
droplets start to freeze on impact with
an aircraft surface.
impact resistance impact resistance /mpkt r|
zstəns/ noun the ability of a material
to withstand an impact
impair impair /m|peə/ verb to cause to
become less effective
Constant exposure
to very loud noise impairs the
hearing.
The pilot’s vision may be
temporarily impaired by lightning
flashes.
An incorrect grade of fuel
impairs engine performance.
impairment impairment /m|peəmənt/ noun a
lessening of effectiveness
De-icing
equipment is used to prevent impairment
of the lifting surfaces through ice
formation.
impart impart /m|pɑt/ verb to give, to pass
on
A rotating propeller imparts rearward
motion to a mass of air.
impedance impedance /m|pid(ə)ns/ noun total
electrical resistance to current flow in
an alternating current circuit
Impedance
will vary with changes in frequency.
impede impede /m|pid/ verb to hinder or
obstruct progress
Hills and mountains
impede the horizontal flow of air.
impeller impeller /m|pelə/ noun a rotor used
to force a fluid in a particular direction
importance importance /m|pɔt(ə)ns/ noun significance,
strong effect or influence

Upper winds are of great importance in
meteorology. (NOTE: The expressions
of fundamental importance, of great
importance, of prime importance, of
utmost importance, of vital importance
all mean very important.)
import duty import duty /mpɔt djuti/ noun
payment made to a government on particular
goods imported or exported
the
duty payable on a carton of cigarettes
Also called customs duty, duty
impose impose /m|pəυz/ verb 1. to force
something upon a person or thing
The
trimmer is used to ease the loads
imposed on the flying controls during
flight. 2.  to impose a fine to require
somebody to pay a sum of money as
punishment  to impose restrictions to
place limitations on somebody’s actions
improve improve /m|pruv/ verb to make or
become better
Turbochargers improve
aircraft performance.
The trainee’s
flying skills improved a lot in a short
period of time.
improvement improvement /m|pruvmənt/ noun
the process of becoming better, or
something that makes a thing better

An improvement in weather conditions
enabled the flight to depart.
impulse impulse /mpls/ noun a force of
short duration
A magneto is designed
to produce electrical impulses one after
another at precise intervals, so that
each separate impulse can be used to
provide a spark at a spark plug.
impulse magneto impulse magneto /mpls m$|
nitəυ/ noun a magneto with a mechanism
　
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本文鏈接地址：Dictionary of Aviation上(108)