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possibility of hijacking, bombs and
stowaways.
hill hill /hl/ noun an easily-seen, natural
elevation, smaller than a mountain

Slopes on the side of a hill or mountain
facing away from the sun receive less
intense radiation.
Hill shading is pro-
hinder 112
duced by assuming that bright light is
shining across the chart sheet so that
shadows are cast by the high ground.
hinder /hndə/ verb to make it difficult
for something to happen
Free
flow of fuel may be hindered by a blockage
in the fuel line.
Her illness hindered
his progress on the course.
hinge /hnd"/ noun a device which
allows a door, flap or lid to open and
close on a stationary frame
Flying
control hinges should be inspected
before flight.  verb to move against a
stationary frame
Access to the engine
compartment is normally via hinged
cowling panels.
HIRF HIRF abbreviation high-intensity radiated
fields
HMR HMR abbreviation helicopter main
route
hoar /hɔ/, hoar frost noun a frozen
dew which forms on outside surfaces
when the temperature falls below freezing
point
Rapid descent from cold
altitudes into warm moist air may produce
hoar frost on the aircraft.
hold hold /həυld/ noun an area or compartment
within the aircraft for carrying
freight
Carry-on baggage is limited
by regulations as to size and weight and
items in excess of this should be stowed
in the luggage hold.  verb 1. to keep
and prevent from moving
The function
of the autopilot system is to hold
the aircraft on a desired flight path by
means of gyroscopes and/or accelerometers.

If the operating pressure falls or
fails, a mechanical lock holds the
reverser in the forward thrust position.
2. to keep an aircraft in a particular
position on the ground or in the air
while waiting for further clearance from
air traffic control
It is normal practice
for ATC to hold taxiing aircraft well
clear of the glide path and localiser
antenna when visibility is poor. 3. to
have and keep in the hand
Hold the
microphone in your right hand.  handheld
possible to hold in the hand

Nowadays, headsets are usually used in
preference to hand-held microphones.
4. to have (NOTE: holding – held)  he
holds an IMC rating he has an IMC
rating
holder holder /həυldə/ noun 1. a device for
holding something
a holder for a fire
extinguisher 2. a person who has a particular
title or qualification
a holder of
two awards for distinguished service
holding fuel holding fuel /həυldŋ fjuəl/ noun
extra fuel carried by an aircraft to allow
for time spent in the hold waiting for air
traffic control clearance
holding pattern holding pattern noun a racetrackshaped
flight pattern with two parallel
sides and two turns, flown usually while
an aircraft is waiting for clearance to
land
holding point holding point /həυldŋ pɔnt/ noun
1. a particular location, in the air or on
the ground where aircraft spend time,
waiting for further clearance from air
traffic control 2. a place, often designated
Alpha, Bravo, Charlie, etc., where
aircraft wait before entering the runway,
as instructed by air traffic control
holding stack holding stack /həυldŋ stk/ an
area of airspace where planes are
instructed to wait before landing if there
are delays (NOTE: Aircraft circle and
descend according to the controller’s
instructions until they are released from
the lowest height in the stack for their
final approach to the airport.)
hollow hollow /hɒləυ/ adjective having a
space within, not solid
a hollow drive
shaft Opposite solid
home home /həυm/ noun the home airfield 
home airfield the airfield which one
returns to after a two-leg flight
homeward homeward /həυmwəd/ adjective
going towards home
homeward journey
 adverb  homeward bound
heading towards home
homewards homewards /həυmwədz/ adverb
towards home
They were heading
homewards when the accident happened.
homing homing /həυmŋ/ noun a flight
towards or away from a radio station
while using direction finding equipment

Where an RBI is fitted, homing
to an NDB can be made by initially
turning the aircraft until the relative
bearing is zero.
　
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