the Aviation Dictionary

L . landing area [ICAOl
LIDmax - The maximum ratio between total lift (L) and
total drag (D). This point provides the best glide speed.
Any deviation from the best glide speed increases drag
and reduces the distance of the glide.
labyrinth air seal - The thin sheet metal rims on turbine
blades, either rotating or stationary, that control air
leakage from the gas path to the inner portions of the
engine. Same as knife edge air seal.
labyrinth oil seal - A main bearing oil seal. It is
configured with thread-type grooves that allow gas
path air to leak inward to the bearing sump and keep oil
mist from escaping. Unlike the carbon seal, which rides
on a surface, the labyrinth oil seal has a small clearance
between its sealing lands and the rotating shaft.
lacing cord - A strong cotton, linen, or synthetic fiber
cord used to rib stitch fabric covering to an aircraft
structure. Also referred to as rib-stitching cord.
lack of common experience - In communication, a
difficulty that arises because words have different
meanings for the source and the receiver of information
due to their differing backgrounds.
lacquer - The pigments dissolved in a volatile base
(solvents, plasticizers, and thinners) in preparation for
spraying as a liquid. Cures to a durable surface when
the solvent evaporates.
lag - 1. A delay in time. 2. To fall behind.
lagging current - An occurrence in an AC inductive
reactance circuit whereby changes in the voltage occur
before changes in the current. Current, therefore, lags
the voltage.
lagging material - An insulating material wrapped
around aircraft plumbing to prevent the unwanted loss
of heat to the outside air.
LAHSO - An acronym for "Land and Hold Short
Operation." These operations include landing and
holding short of an intersecting runway, a taxiway, a
predetermined point, or an approachldeparture
flightpath.
LAHSO-dry - Land and hold short operations on
runways that are dry.
LAHSO-wet - Land and hold short operations on
runways that are wet (but not contaminated).
laminar - Arranged in or consisting of thin layers.
laminar flow - The nonturbulent flow of air or viscous
fluid over a surface.
laminate -A structure made by bonding together two or
more layers of material with resin. It contains no core
material.
laminate ply - In composites, one fabric-resin or fiberresin
layer that is bonded to adjacent layers in the
curing process.
laminated - Composed of thin layers of material firmly
bonded or united together.
laminated core - The core of a coil, transformer, or
other electrical device consisting of a stack of thin, soft
iron sheets insulated from each other by a film oxide or
varnish. Laminated cores are used to minimize eddy
currents.
laminated plastic material - A reinforced plastic resin
made up of layers of material such as cloth, paper, or
wood bonded with plastic resin to form complex
shapes or to produce a material with high strength for
its weight.
laminated structure - An element or part of an aircraft
made up of layers of material bonded together to form
complex shapes or to produce a material with high
strength for its weight.
laminated wood - Layers of wood bonded together to
make a stronger material.
lampblack - The black soot from incompletely burned
carbonaceous materials used for making generator
brushes. Lampblack is used as a pigment when mixed
with rubber for making tires.
land and hold short operations (LAHSO) -
Operations that include simultaneous takeoffs and
landings andlor simultaneous landings when a landing
aircraft is able and is instructed by the controller to
hold-short of the intersecting runwayltaxiway or
designated hold-short point. Pilots are expected to
promptly inform the controller if the hold short
clearance cannot be accepted.
land breeze - A coastal breeze blowing from land to
sea, caused by temperature difference when the sea
surface is warmer than the adjacent land. Therefore, it
usually blows at night and alternates with a sea breeze,
which blows in the opposite direction by day.
land plane - An airplane designed to operate from the
surface of land using wheeled landing gear rather than
pontoons or skis for landing on water or snow.
lander - A space vehicle designed for landing on a
celestial body.
landing area - Any locality either on land, water, or
structures, including airportsheliports and intermediate
landing fields, used or intended to be used, for the
landing and takeoff of aircraft whether or not facilities
are provided for the shelter, servicing, or for receiving
or discharging passengers or cargo.
landing area [ICAO]- That part of the movement area
intended for the landing and takeoff of aircraft.
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