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assembly of the secondary heat
exchanger.
When the controlling
super-charger outlet pressure is
reached, the capsule is compressed sufficiently
to open its bleed valve.
outline outline /aυtlan/ noun 1. a line
around the shape of something
Warning
labels have a solid red outline. 2. a
shape
At low level, features are most
easily recognised from their outline in
elevation.
Cumulus cloud has
detached domes or towers which are
generally dense and have sharp outlines.
 verb to explain simply and
briefly
The changes in conditions outlined
in the next paragraph.
165 overload
out-of-balance turn out-of-balance turn /aυt əv
bləns t%n/ noun a turn in which the
aircraft ‘skids’ upwards and outwards
from the turn or ‘slips’ inwards and
downward
During an out-of-balance
turn, the ball in the slip indicator will be
deflected to the left or right.
out of trim out of trim /aυt əv trm/ adjective
referring to a situation in which the aircraft
is not in static balance in pitch, so
that if the pilot releases the yoke or control
stick, the aircraft will start to climb
or descend
output output /aυtpυt/ noun the product of a
process
Air density will affect the output
of the engine.
The function of the
supercharger is to increase the power
output.
The power output of an engine
depends on the weight of mixture which
can be burnt in the cylinders in a given
time.
outrigger outrigger /aυtr$ə/ noun a projection
attached to an aircraft to stabilise it
or to support something
outward outward /aυtwəd/ adjective moving
away from the centre or starting point

The piston draws fluid into the cylinders
on the outward stroke and expels fluid
into the system on the inward stroke.

bound
outwards outwards /aυtwədz/ adverb away
from the centre or starting point,
towards the outside
The door opens
outwards. (NOTE: The US English is
outward.)
overall overall /əυvər|ɔl/ adjective including
everything
The total aerodynamic
losses result in an overall turbine efficiency
of 92%.
Although the student
failed in one of the five exams, her overall
result was a pass.  adverb generally

Overall, the test flight was a success.
 noun /əυvərɔl/ a one-piece item of
protective clothing
The engineer was
wearing an overall to prevent his
clothes from getting dirty.
overalls overalls /əυvərɔlz/ plural noun protective
trousers with a bib and straps
over the shoulders
Wear overalls to
protect your clothes.
overcome overcome /əυvə|km/ verb to beat,
to conquer, to win against
The effects
of anoxia at high altitudes can be overcome
by breathing through a mask.

Drag must be overcome with thrust in
order for an aircraft to increase speed.
overflew overflew /əυvə|flu/  overfly
overflight overflight /əυvəflat/ noun the flight
of an aircraft over an area
overfly overfly /əυvə|fla/ verb to fly over an
area (NOTE: overflew – overflown)
overhang overhang /əυvəhŋ/ noun 1. the
distance from the last outer strut to the
end of a monoplane’s wing 2. a distance
equivalent to half of the difference in
the spans of the two wings of a biplane
overhaul overhaul verb /əυvə|hɔl/ to take
apart and examine carefully in order to
repair and clean, etc.
To overhaul the
system will take a couple of days. 
noun /əυvəhɔl/ the act of taking apart
in order to repair and clean
Other than
the oil pump and the generator rotor,
there are no other moving parts in the
system to wear or which require periodic
overhaul.
overhead overhead /əυvə|hed/ adjective 1.
vertically above the point where a
course is measured or timed
The aircraft
started from overhead A at 1000
hours on a heading of 230°T. 2. above
the level of people’s heads
Overhead
baggage lockers must be secured immediately
prior to take-off.  adverb above
one’s head
She noticed a plane flying
overhead.
overheat overheat /əυvə|hit/ verb to get too
hot
An acceleration/deceleration control
is fitted to prevent the turbine
assembly from overheating during
　
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