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network that allows pilots to choose and
fly on any bearing relative to a transmitter
on the ground
one-in-sixty rule one-in-sixty rule /wn n sksti
rul/ noun in navigation, every 1° of
track error, and every 60 nautical miles
flown, results in the aircraft being 1 nm
off track
onshore onshore /ɒnʃɔ/ adjective towards
the coast
onshore wind onshore wind /ɒnʃɔ wnd/ noun a
wind which blows from the sea towards
the coast. Compare offshore wind
opacity opacity /əυ|psti/ noun the state of
not allowing light to pass through

Sometimes, it is possible to estimate the
depth and opacity of the layer of mist or
fog from the ground observations.
opaque opaque /əυ|pek/ adjective not allowing
light to penetrate or pass through

Rime ice is an opaque, white, granular
ice which forms on leading edges.
opening 162
opening opening /əυp(ə)nŋ/ noun 1. a space
which acts as a passage through which
something or somebody can go
an
inlet valve opening 2. a formal start of
operation
the opening of the new flying
school 3. a vacancy for a job

There’s an opening for a new chief
ground instructor.
open-skies open-skies /əυpən skaz/ adjective
referring to a policy of allowing aircraft
belonging to any country to fly over an
area, without restrictions on surveillance
of military installations
operate operate /ɒpəret/ verb 1. to control
the working of
The control column
operates the ailerons and elevators.

The flaps are operated by a switch. 2. to
use or manage
The airline operates a
fleet of Boeing aircraft. 3. to perform or
function
Jet transports operate at
high altitudes. 4. to perform a surgical
procedure, by cutting into the body

The surgeon operated on the patient.
operating jack operating jack /ɒpəretŋ d"k/
noun a device which converts rotary
motion into linear or reciprocating
motion in order to move heavy control
surfaces
operating weight operating weight /ɒpəretŋ wet/
noun the total mass of aircraft ready for
flight but excluding fuel and payload

The type of undercarriage fitted to an
aircraft is governed by the operating
weight.
operation operation /ɒpə|reʃ(ə)n/ noun 1. the
process of making something work

The operation of the ignition system in
a light aircraft is quite simple. 2. 
long-haul operations flying over longdistance
routes 3. an effect  to come
into operation to come into effect

The new procedures come into operation
on 1st January. 4. a surgical procedure

The doctor performed an operation.
5. a procedure such as addition or
subtraction
‘…periodically check the carburettor
heating system and controls for proper
condition and operation’ [Civil Aviation
Authority, General Aviation Safety Sense
Leaflet]
operational operational /ɒpə|reʃ(ə)nəl/ adjective
1. working or functioning
Air
traffic control facilities were not operational
at the time of the accident.  the
operational life of the aircraft the
expected working life of an aircraft 2.
ready for use, referring to an aircraft in
a suitable condition to fly  an operational
aircraft an aircraft that can be
used for its assigned purpose
operational air traffic operational air traffic
/ɒpəreʃ(ə)nəl eə trfk/ noun
flights operating in accordance with
military air traffic service procedures.
Abbreviation OAT
operations department operations department /ɒpə|
reʃ(ə)nz d|pɑtmənt/ noun the part
of an airline or airport organisation
which deals with flight operations
operative operative /ɒp(ə)rətv/ adjective
functioning or working
The system is
now operative after the recent maintenance.
operator /ɒpəretə/ noun a person
who operates or uses equipment
A
ring graticule around the edge of the
cathode ray tube enables the operator
to read the bearing directly.
oppose /ə|pəυz/ verb 1. to work
against
In level flight, the force of lift
opposes the force of gravity. 2. to reject,
be in conflict with or try to prevent

The local people oppose the building of
　
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