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LCD LCD /el si di/ abbreviation liquid
crystal display
LDA LDA abbreviation landing distance
available
LDR LDR abbreviation landing distance
required
lead lead1 /led/ noun a very heavy soft
metallic element. Symbol Pb  leadfree
not containing lead
Low-lead or
lead-free fuel is used in most modern
piston engines.
lead lead2 /lid/ noun 1. an electrical wire
or narrow cable
A lead connects the
monitor to the computer. 2.  to take
the lead to take control of a situation

It is vital in any emergency situation
that a crew member should take the
lead.  verb 1. to guide or show the way
by going first
In an emergency situation
the aircraft commander may lead
his passengers to safety.
In a smokefilled
cabin, floor lighting leads passengers
to the emergency exit. 2. to cause

In winter, the cold conditions often lead
to frost and fog.
Contraction of metal
parts and seals can lead to fluid leakage.
(NOTE: leading – led)
lead-acid battery lead-acid battery /led sd
bat(ə)ri/ noun a system of lead plates
and dilute sulphuric acid, used as a
starter battery or traction battery
leading edge leading edge /lidŋ ed"/ noun the
front part of the wing which meets the
oncoming air first
In icing conditions,
ice may build up on the leading edges.
leak leak /lik/ noun the escape of liquid or
gas from a sealed container, or the
amount of liquid or gas that has escaped

Any failure of the aircraft structure
may cause a leak of pressurised air
which might be very difficult to cure. 
exhaust leak an escape of exhaust
gases  verb to escape from a sealed
container
Fuel may leak from a fuel
tank if the drain plug is not seated correctly.
leakage leakage /likd"/ noun the escape of
liquid or gas from a sealed container

Any internal or external leakage of fuel
will cause a reduction in the operating
period. (NOTE: Leak is normally used
for an individual instance while leakage
is used more generally: There is a fuel
leak from the central tank; Fuel leakage
is a safety hazard.)
lean lean /lin/ adjective referring to a mixture
in which the ratio of air to fuel is
greater than usual
Moving the mixture
control lever aft to the lean position
reduces the amount of fuel mixing with
the air.
lean mixture lean mixture /lin mkstʃə/ noun a
fuel/air mixture in which the ratio of air
to fuel is greater than usual
LED LED /el i di/ noun a semiconductor
diode that emits light when current is
applied. LEDs are used in cockpit displays.
Full form light-emitting diode
lee lee /li/ adjective, noun which is protected
from the wind
The air on the
lee side is drier than that on the wind-
135 level
ward side.
The flow of air over and to
the lee of hills and mountains may
cause particularly severe turbulence.
Opposite windward
leg /le$/ noun part of a flight pattern
that is between two stops, positions, or
changes in direction
An airfield traffic
pattern is divided into take-off, crosswind
leg, downwind leg, base leg and
final approach.
‘…their route was across the States to
Canada, Greenland and the North Pole,
into Norway, through Europe, back to
Iceland, then two long legs across the
Atlantic via South Greenland and back to
Seattle’ [Pilot]
legal /li$(ə)l/ adjective lawful or
within the law
Alcohol concentrations
of 40 milligrams per 100 millilitres, i.e.
half the legal driving limit in the UK,
are associated with substantial
increases in errors committed by pilots.
legend /led"ənd/ noun a list explaining
the symbols on a chart or a map
A
legend is usually to be found at the edge
or on the reverse side of most topographical
charts.
length length /leŋθ/ noun 1. a measurement
along something’s greatest dimension

the length of the aircraft
The runway
length is 3 kilometres. 2. a piece of
something that is normally measured
along its greatest dimension
a length
of pipe 3. the extent from beginning to
end
the length of a book 4. extent or
duration, the distance between two
points in space or time  the length of a
briefing how much time the briefing
takes  the length of the working life
of components how long the components
last
the length of a flight 1. the
time it takes to complete a flight
The
length of the flight meant that there was
　
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