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heavier-than-air heavier-than-air /heviə θən eə/
adjective weighing more than the air it
displaces, and so needing power to fly
heavy heavy /hevi/ adjective having a lot of
weight  a heavy load a load of great
weight  heavy rain rain which is dense
and distributes a lot of water over the
surface of the Earth in a relatively short
time
heavy-duty heavy-duty /hevi djuti/ adjective
referring to something designed for
111 hill
hard wear or use
a heavy-duty battery

Longerons are heavy-duty steel members.
heavy landing heavy landing /hevi lndŋ/ noun
a routine landing in which the aircraft
makes contact with the surface with
more force than usual, thereby possibly
causing damage to the undercarriage

The pilot reported a heavy landing.
hedgehop hedgehop /hed"hɒp/ verb to fly at
very low height above the ground
height height /hat/ noun the vertical distance
of a point, level or object measured
from a particular point, e.g. sea
level
Pressure decreases with increasing
height.  height of the aircraft the
vertical distance, measured in feet, of
the aircraft above the surface of the
earth
held held /held/  hold
heli heli /heli/ noun a rotary-wing aircraft
heliborne heliborne /helibɔn/ adjective transported
by helicopter
helicopter helicopter /helkɒptə/ noun an aircraft
with one or more rotors rotating
around vertical axes which provide lift
and control
Helicopter operations are
carried out at the airport.
helicopter rotor helicopter rotor /helkɒptə rəυtə/
noun two or more rotating blades,
known as the main rotor, which provide
lift and thrust for a helicopter;
helideck helideck /helidek/ noun a deck on
something such as a ship or offshore oil
platform that is used as a landing area
for helicopters
heliograph heliograph /hilə|$rɑf/ noun an
instrument with a mirror to send messages
by reflecting the sun
Heliographs
enable reflected sunlight to be
directed to a ship or aircraft in periods
of direct sunlight.
helipad helipad /helipd/ noun an area
where helicopters take off and land
heliport heliport /helipɔt/ noun an airport
designed for helicopters
helistop helistop /helistɒp/ noun a place
where helicopters can take off and land,
but usually one that does not have the
support facilities found at a heliport
helo helo /hiləυ/ noun 1. a rotary-winged
aircraft 2. same as heliport
hemisphere hemisphere /hemsfə/ noun half a
sphere
Hertz Hertz /h%ts/ noun the SI unit of frequency,
defined as the number of cycles
per second of time. Abbreviation Hz
HFHF abbreviation high frequency
high high /ha/ adjective 1. having great
vertical distance
a high mountain 2.
great, large, a lot  high engine rpm
fast engine speed  high pressure a lot
of pressure  high reliability good reliability
 high speed a fast speed  high
temperature a hot temperature  noun
an area of high atmospheric pressure

There is a high over the British Isles.
high frequency high frequency /ha frikwənsi/,
high frequency band /ha
frikwənsi bnd/ noun a radio communications
range of frequencies
between 3–30 MHz. Abbreviation HF
high-performance high-performance /ha pə|
fɔməns/ adjective a system which
provides better-than-usual output
an
engine with a high performance
Some
high-performance engines have coolant
and oil system thermostats which aid
warming-up.
high performance aircraft high performance aircraft /ha
pə|fɔməns eəkrɑft/ noun an aircraft
capable of flying faster, higher or with
more manoeuvrability than normal aircraft
hijack hijack /had"k/ verb to take over
control of an aircraft by one or several
unauthorised person or persons with the
intention of forcing the crew to fly it to
a different destination
The airliner
was hijacked on its way to Paris.
hijacker hijacker /had"kə/ noun a person
who hijacks an aircraft or other vehicle
hijacking hijacking /had"kŋ/ noun the act
of taking over control of an aircraft by
one or several unauthorised person or
persons with the intention of forcing the
crew to fly it to a different destination

The crew must be alert at all times to the
　
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本文鏈接地址：Dictionary of Aviation上(103)