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113 hub
homogeneous homogeneous /həυməυ|d"iniəs/
adjective of the same kind
If the air
over a large region were homogeneous,
there would be no horizontal differences
in surface temperature.
The
atmosphere is not homogeneous – pressure,
temperature and humidity can all
change with height.
hop hop /hɒp/ noun a flight or section of a
flight in an aircraft (informal )
horizon horizon /hə|raz(ə)n/ noun the line
where the sky and the ground appear to
join  visual horizon a horizon which
can be seen
horizontal horizontal /hɒr|zɒnt(ə)l/ adjective
parallel to the horizon, or at right angles
to the vertical
The horizontal motion
of air is known as wind.
horizontal axis horizontal axis /hɒrzɒnt(ə)l
kss/ noun a horizontal reference line
of a graph
The plot shows the effect of
airspeed on lift with airspeed shown on
the horizontal axis and lift on the vertical
axis.
horizontal situation indicator horizontal situation indicator
/hɒrzɒnt(ə)l stʃu|eʃ(ə)n
ndketə/ noun a cockpit instrument
which gives the pilot information about
the direction of the aircraft’s flight path

On the aircraft, the horizontal situation
indicator is located on the instrument
panel below the attitude indicator.
Abbreviation HSI
COMMENT: The horizontal situation
indicator combines the function of the
heading indicator and a VOR/ILS
display.
horizontal stabiliser horizontal stabiliser
/hɒrzɒnt(ə)l stebəlazə/ noun a
tailplane
The horizontal stabiliser
provides stability about the lateral axis
of the aircraft.
horn horn /hɔn/ noun a device for projecting
sound  warning horn device
which emits a loud warning noise
horn balance horn balance /hɔn bl(ə)ns/
noun part of a control surface forward
of the hinge line which reduces the
force needed by the pilot to move the
surface
horsepower horsepower /hɔspaυə/ noun the
accepted unit for measuring the rate of
doing work
Horsepower is defined as
33,000 foot-pounds of work done in one
minute. Abbreviation h.p., HP
hose hose /həυz/ noun a long, flexible pipe
usually made of fabric, plastic or rubber
for pumping gases or liquids  refuelling
hose a flexible pipe used to pump
fuel from the bowser to the aircraft
hot hot /hɒt/ adjective very warm, having
a high temperature
hot weather  hot
air air introduced to melt ice forming in
the carburettor in a piston engine aircraft
hour hour /aυə/ noun 1. a period of time
which lasts sixty minutes
It’s a threehour
flight to Greece from London. 2. a
method of indicating time
Flight BA
321 landed at Heathrow at 10.30 hours.
house house /haυz/ verb to contain or
accommodate
The areas between the
ribs in the wings are utilised to house
fuel tanks.
The wing tips house the
navigation lights.
housing housing /haυzŋ/ noun a compartment
or container
The crankcase is
the housing that encloses the various
mechanical parts surrounding the
crankshaft.  engine housing engine
compartment
hover hover /hɒvə/ verb to remain stationary,
relative to the earth, while in the air
 noun a period of stationary flight

During a hover, helicopter pilots must
be able to coordinate movements of
both hands and feet.
hovercraft hovercraft /hɒvəkrɑft/ noun a
vehicle that can travel over land and
water supported on a cushion of air that
is produced by a powerful engine that
blows air downwards. Also called air
cushion vehicle, ground effect
machine
however however /haυ|evə/ adverb but
The
wind was gusty, however the landing
was good.
The incident was serious,
however she escaped with only a warning.
hrs hrs abbreviation hours
HSI HSI abbreviation horizontal situation
indicator
hub hub /hb/ noun a major airport where
international or long-distance flights
take off and land
hub airport 114
hub airport hub airport /hb eəpɔt/ noun
same as hub
HUD HUD abbreviation head-up display
human factors human factors /hjumən fktəz/
noun the study of the way in which
humans handle, and react to, things in
their environment. It is used in aviation
　
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本文鏈接地址：Dictionary of Aviation上(105)