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which objects can be seen and recognised
by an observer on the ground with
normal eyesight and under conditions
of normal daylight illumination.
obstacle obstacle /ɒbstək(ə)l/ noun something
which blocks a path or prevents
progress
Low frequency transmissions
can penetrate obstacles such as mountains.

Knowing the heights of obstacles
en route, it must be ensured that in
the event of an emergency, the flight
may be continued in safety.
obstacle clearance obstacle clearance /ɒbstək(ə)l
klərəns/ noun the fact of being at a
sufficient height to be able to fly over
any obstacles in the area
obstruct obstruct /əb|strkt/ verb to block a
path or to prevent the progress of something

Bags and luggage must not
obstruct the aisles.
A safety valve is
normally provided, in case the water
separator assembly becomes obstructed
by ice.
obstruction obstruction /əb|strkʃən/ noun 1.
the act or process of obstructing
The
glidepath antenna cannot be placed
close to the centre line of the runway
because it would cause an obstruction.
2. something which blocks a path or
prevents progress
Before start-up, the
obtain 160
air intakes and jet pipes must be
inspected, to ensure that they are free
from any debris or obstruction.
‘…taxiways and aerodrome obstructions
may be hidden by snow, so ask if you are
not certain’ [Civil Aviation Authority,
General Aviation Safety Sense Leaflet]
obtain obtain /əb|ten/ verb to acquire, to get

Telephone the meteorological office in
order to obtain the latest weather forecast.

The probes are positioned in the
gas stream in order to obtain an accurate
temperature reading.
obvious obvious /ɒbviəs/ adjective clear and
easily seen or understood
It is obvious
that high ground will disturb the smooth
horizontal flow of air.
occasion occasion /ə|ke"(ə)n/ noun the time
at which an event or happening occurs

In recent months the aircraft suffered
two engine failures, on the first occasion
the aircraft force-landed safely.

The maiden flight of an aircraft is a
great occasion.  on occasions sometimes
occasional occasional /ə|ke"(ə)n(ə)l/ adjective
happening from time to time 
occasional rain periodic rain  occasional
turbulence turbulence happening
from time to time
occluded front occluded front /ə|kludd frnt/
noun a weather front created when air is
forced upward from the Earth’s surface,
as when a cold front overtakes and
undercuts a warm front
Jet streams
are very rare near occluded fronts
because of the much smaller temperature
gradient across the fronts.
occlusion occlusion /ə|klu"(ə)n/ noun the
forcing of air upward from the Earth’s
surface, as when a cold front overtakes
and undercuts a warm front
If the air
ahead of the warm front is less cold
than the air behind the cold front, the
cold front will undercut the less cold air
and form a cold occlusion.
occupant occupant /ɒkjυpənt/ noun a person
who has a seat in an aircraft  occupants
the crew plus passengers
Inflight
emergency procedures are
designed to successfully combat airborne
emergencies which threaten the
safety of the aircraft and its occupants.
occupy occupy /ɒkjυpa/ verb 1. to have a
position, to be in a place
The passenger
is occupying the wrong seat. 2. to
busy oneself
Once an evacuation
process is under way the crew will be
fully occupied carrying out emergency
drills.
occur occur /ə|k%/ verb to happen
Heavy
rains occur during the monsoon season.

Tropical revolving storms generally
occur from June to October.
An accident
occurred on June 12th.
occurrence occurrence /ə|krəns/ noun a happening
or event
There were a number
of occurrences of hijacking in the eighties.

The occurrence of the equatorial
jet stream is due to a temperature gradient
with colder air to the south.
ocean ocean /əυʃ(ə)n/ noun 1. the body of
salt water which covers the earth (NOTE:
This is a chiefly American usage: British
English prefers the word sea.) 2.
any of the major sea areas of the world

the Atlantic Ocean
COMMENT: The five oceans are: the
Atlantic, the Pacific, the Indian, the
Arctic and the Antarctic (or Southern).
　
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