the Aviation Dictionary

low blower . Ive
including the go-around maneuver where the pilot oxygen is stored under pressures of approximately 450
intentionally does not make contact with the runway. PSI.
low blower - The lower speed setting of a two-speed
internal supercharger.
low bypass turbofan - An engine with a one-to-one
bypass ratio. Approximately the same air mass flows
across the fan as across the core engine.
low frequency (LF) - The frequency band between 30
and 300 kHz.
low IFR (LIFR) - Weather characterized by ceilings
lower than 500 feet AGL andlor visibility less than one
statute mile.
low pitch, high RPM setting - The setting of a
controllable-pitch propeller that allows the engine to
produce its highest RPM with the propeller at its lowest
pitch.
low pressure turbine - The turbine rotor that drives the
low pressure compressor in a dual or triple spool axial
flow gas turbine engine.
lower turbulent zone - The portion of the lee wave
system, starting at ground level extending to just above
the mountaintop, and marked by turbulence.
low-tension ignition system - A magneto system used
for reciprocating engine airplanes that fly at high
altitudes. It consists of a rotating magnet, a cam,
breaker points, a condenser, a coil with only the
primary winding, and a carbon brush-type distributor.
The primary current is directed through the distributor
to a coil for each individual spark plug. These coils
have a primary and a secondary winding that generate
the high voltage at the spark plug.
low-tension magneto - An ignition system used for
reciprocating engine airplanes that fly at high altitudes.
It consists of a rotating magnet, a cam, breaker points,
condenser, a coil with only the primary winding, and a
carbon brush-type distributor. The primary current is
directed through the distributor to a coil for each
individual spark plug. These coils have a primary and a
secondary winding that generate the high voltage at the
spark plug.
low-voltage ignition system - A main ignition system
used on turbine engines with a voltage output in the
range of approximately 1,000 to 5,000 volts delivered
to the igniter plug.
low-frequency radio waves - Radio waves of low-wing airplane - An airplane having one main
frequency lower than the bottom of the commercial supporting aerodynamic surface flush with the bottom
AM broadcast radio band.
of the fuselage.
low-lead 100-octane aviation gasoline (100 LL) - lubber line - The reference line on a magnetic compass
Gasoline that contains a maximum of 2 ml. of or directional gyro that represents the heading of a ship
tetraethyl lead per gallon. Normal 100-octane avgas is or aircraft.
allowed to contain 4.6 ml. of tetraethyl lead per gallon.
lubricant - A natural or artificial substance used to
low-level wind shear - Wind shear below 2,000 feet reduce friction, heat, and wear between moving parts.
AGL along the final approach path or along the takeoff It also can be used to prevent corrosion on metallic
and initial climb out path.
surfaces.
low-level wind shear alert system (LLWAS)- A lubricating - The process of applying a lubricant.
'ystem at many large that Lucite - A transparent, thermoplastic resin used for
monitors surface winds at remote sites on the airport. A
windshields and side windows of small aircraft. A
computer evaluates the wind differences from the
trademark of the DuPont company.
remote sites to determine if a wind shear problem
exists.
lug - A projection from a structural member used as an
low-pass filter - A filter circuit designed to pass
attachment point.
low-frequency signals and attenuate high-frequency luminance - The intensity of light emitted or scattered
signals.
from a surface area in a given direction.
low-pressure compressor - The front section of a dual
compressor gas turbine engine Also referred to as the
Ni compressor or low-speed compressor.
low-pressure compressor gas turbine engine - The
front section of B dual c&npressor driven by the last
stages of the turbine. Also referred to as the N1
compressor or low-speed compressor.
low-pressure oxygen system - A gaseous oxygen
system formerly used in military aircraft in which the
luminescence - The emission of light from essentially
nonthermal sources such as phosphorescence.
luminous paint - A paint that glows in the dark. Used
for marking aircraft instrument dials and pointers.
lye - An alkaline solution consisting of potassium
hydroxide or sodium hydroxide.
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