Dictionary of Aviation上(118)

曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者

pressure to avoid any inward leakage of
poisonous gases at the mask.
inwards inwards /nwədz/ adverb towards
the inside or the interior
The door
opens inwards. Opposite outwards
ion ion /aən/ noun an atom or a group of
atoms that has obtained an electric
charge by gaining or losing one or more
electrons
negative ion
positive ion

Ultra-violet light from the sun can
cause electrons to become separated
from their parent atoms of the gases in
the atmosphere, the atoms left with
resultant positive charges being known
as ions.
ionisation /aəna|zeʃ(ə)n/, ionization
noun the process of producing
ions by heat or radiation
The intensity
of ionisation depends on the strength of
the ultra-violet radiation and the density
of the air.
ionosphere ionosphere /a|ɒnəsfə/ noun the
part of the atmosphere 50 km above the
surface of the earth
Since the strength
of the sun’s radiation varies with latitude,
the structure of the ionosphere
varies over the surface of the earth.
ionospheric ionospheric /a|ɒnə|sferk/ adjective
referring to the ionosphere
ionospheric attenuation ionospheric attenuation /a|
ɒnəsferk ə|tenju|eiʃ(ə)n/ noun loss
of signal strength to the ionosphere
ionospheric refraction ionospheric refraction /a|
ɒnəsferk r|frkʃən/ noun a change
in direction as the wave passes through
an ionised layer
I/R I/R abbreviation instrument rating
irregular /|re$jυlə/ adjective not
regular
Pilots of long-haul flights are
subject to an irregular sleep pattern.
irrespective irrespective /r|spektv/, irrespective
of preposition taking no account of,
regardless of
Rescue flights continue
their work irrespective of the weather
conditions.
ISA ISA /asə/ abbreviation international
standard atmosphere
isobar isobar /asəυbɑ/ noun a line on a
weather chart joining points of equal
atmospheric pressure
Isobars are
analogous to contour lines.
isobaric /asə|brk/ adjective referring
to or showing isobars
isobaric
charts
isolate /asəlet/ verb to separate
something from other things or somebody
from other people
The low-pressure
fuel cock isolates the airframe fuel
system from the engine fuel system to
enable maintenance and engine removals
to be carried out.
isolated /asəletd/ adjective separate
 isolated rain showers well
spaced out rain showers
isolation isolation /asə|leʃ(ə)n/ noun the
state of being separated from something
or somebody
Isolation of the aircraft’s
passengers and crew from the
reduced atmospheric pressure at altitude
is achieved by pressurisation of the
cabin.
isotach /asəυ|tʃ/ noun a line of
equal wind speed on charts (NOTE: Wind
speed is normally given in the form of
isotachs.)
isotherm isotherm /asəυθ%m/ noun a line of
equal temperature on charts
Ascent of
stable air over high ground may result
in a lowering of the 0°C isotherm.
issue issue /ʃu/ noun a number or copy

The article was in last month’s issue of
the magazine.  verb 1. to give out
The
captain issued the evacuate command.
2. to publish
The magazine is issued
monthly. 3. to give out, to grant
The
Civil Aviation Authority issue licences.
ITCZ abbreviation intertropical convergence
zone
item /atəm/ noun a single article or
unit in a collection, on a list, etc.

Before practising stalls, the pilot should
secure all loose items in the cockpit.
J
JJ symbol joule
JAA JAA abbreviation Joint Aviation
Authorities
jack jack /d"k/ noun a powered device to
move heavy components, such as control
surfaces of large aircraft
jacket jacket /d"kt/ noun 1. a short coat
with long sleeves worn with trousers or
skirt 2. an outer covering or casing

Liquid cooling of a piston engine is
achieved by circulating a liquid around
the cylinder barrels, through a passage
formed by a jacket on the outside.
jam jam /d"m/ verb to cause moving
parts to become locked and unable to be
moved  a jammed door a door which
　
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