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acceleration, and to prevent flame-out
during deceleration.
overlap overlap noun /əυvəlp/ part of one
thing covering something else  verb
/əυvə|lp/ to have an area or range in
common with something else, or to
cover part of something else
The maps
overlap each other at the edges by three
centimetres. (NOTE: overlapping –
overlapped)
overload overload noun /əυvələυd/ an excessive
amount of work or electricity

Resettable circuit protective devices
should be designed so that when an
overload or circuit fault exists, they will
open the circuit.  verb /əυvə|ləυd/ 1.
overload operations 166
to load a device or system, such as an
electrical circuit, with too much work;
to demand more than a system is capable
of
Operating pressure is maintained
in that part of the system which
leads to the selector valves, and some
method is used to prevent overloading
the pumps. 2. to load too heavily
The
aircraft failed to gain height after takeoff
because it was overloaded.
overload operations overload operations /əυvələυd
ɒpəreʃ(ə)nz/ noun operation of aircraft
in unusual situations when takeoff
weight exceeds the permitted maximum
override override /əυvə|rad/ verb to take
over control of the operation of an automatic
device or system
A circuit-protective
device must not be of a type
which can be overridden manually.
(NOTE: overriding – overrode – overridden)
overrun overrun /əυvərn/ noun a cleared
level area at the end of a runway, available
in case a plane does not stop
quickly enough
overshoot overshoot /əυvə|ʃut/ verb to fly
past a target
The pilot tried to land but
the aircraft overshot the runway. (NOTE:
overshooting – overshot)
overspeed overspeed verb /əυvə|spid/ to go
too fast
A fault in the constant speed
drive unit causes the generator to overspeed.
 noun /əυvəspid/ a speed that
is too fast
Overspeed is usually a fault
in the constant speed drive unit which
causes the generator to overspeed.
overspeeding overspeeding /əυvə|spidŋ/ noun
the act of going too fast
Overspeeding
of the engine is prevented by a governor
in the fuel system.
overstress overstress /əυvə|stres/ verb to subject
to too much force
It takes less g
force to overstress a heavy aircraft than
a light one.
owing to owing to /əυŋ tu/ preposition
because of
Integral tanks are now
favoured for aircraft owing to the very
high utilisation of space and saving of
weight.
Owing to the aerodrome being
unserviceable, the landing was made at
another aerodrome some distance
away.
oxidation oxidation /ɒks|deʃ(ə)n/ noun the
combination of a substance with oxygen,
with loss of electrons
When aluminium
surfaces are exposed to the
atmosphere, a thin invisible oxide skin
forms immediately that protects the
metal from further oxidation.
oxide oxide /ɒksad/ noun a compound of
an element with oxygen
When aluminium
surfaces are exposed to the
atmosphere, a thin invisible oxide skin
forms immediately that protects the
metal from further oxidation.
oxidise /ɒksdaz/, oxidize verb to
form an oxide by the reaction of oxygen
with another chemical substance
Over
a period of time, the metal is oxidised by
contact with air.
oxygen oxygen /ɒksd"ən/ noun a colourless,
odourless gas, which is essential to
human life, constituting 21% by volume
of the Earth’s atmosphere
Our bodies
can get oxygen through the lungs.
At
very high altitudes the flying pilot must
be on oxygen at all times, unless an aircraft
dispensation has been obtained.
(NOTE: The atomic number of oxygen is
8.)
ozone ozone /əυzəυn/ noun a poisonous
form of oxygen found naturally in the
atmosphere which is toxic to humans at
concentrations above 0.1 parts per million

The maximum concentration of
ozone is between 20 and 25 km above
the Earth’s surface. Symbol O3
P
PAPA abbreviation public address
Pacific Standard Time Pacific Standard Time /pə|sfk
　
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本文鏈接地址：Dictionary of Aviation下(31)