Aviation Maintenance Terms beginning with L
L-Band
Radio Frequency Band (390 to 1550 MHz)
LCD
Liquid crystal display. A digital display that consists of two sheets of glass separated by a sealed-in, normally transparent liquid crystal material. The outer surface of each glass sheet has a transparent conductive coating with the viewing side etched into character-forming segments with leads going to the edges of the display. A voltage applied between the front and back coatings disrupts the orderly arrangement of molecules and causes the liquid to darken so that light cannot pass through it. The segment to which the voltage is applied appears as black against a reflected background.
LCD
Liquid-crystal Display
LD
Load
LED
Light-emitting Diode
LF (lf)
Low Frequency (30 to 300 KHz)
LO Z
Low Impedance
LOC
Localizer
LORAN
Long-Range Navigation. A [Decommissioned] radio navigation system utilizing master and slave stations transmitting timed pulses. The time difference in reception of pulses from several stations establishes a hyperbolic line of position that may be identified on a LORAN chart. By utilizing signals from two pairs of stations, a fix in position is obtained.
LORAN A
Long Range Aid to Navigation. A hyperbolic navigation system that operates with frequencies of 1,950 kHz, 1,850 kHz, and 1,900 kHz.
LORAN C
The LORAN system used in aircraft. It operates on a frequency of 100 kHz.
LPV
Localizer Performance with Vertical Guidance
LRU
Line replaceable unit. Aircraft components designed to be replaced as a unit while the aircraft is on the flight line.
LRU
Line Replaceable Unit
LRU
Line replaceable unit.
LS
Loudspeaker
LSB
Lower Sideband
LSPTM
Limit Switch Position Transmitter Module
LT
Light
LTS
Lights
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