LAT  Latitude 
L-Band  A radio frequency band from 390 to 1,550 MHz 
LBS  Pounds 
LCA  Layered.Component.Architecture 
LCC  Leadless.Chip.Carrier 
LCD  Liquid Crystal Display 
LCF  Link.Control.Field 
LCI  Logical Channel Identifier 
LCM  Logic.Control.Module 
LCN  Local.Communications.Network 
LCoS  Liquid Crystal on Silicon 
LCP  Lighting.Control.Panel 
LCR  Link.Connection.Refusal 
LCSTB  Low.Cost.Simulation.Test.bed 
LCVSM  Life.Cycle.Value.Stream.Management 
LD  Lower.Data 
LDA  Localizer.Directional.Aid 
LDCC  Leaded.Chip.Carrier 
LDGPS  Local.Area.Differential.Global.Positioning.Satellite 
LDOC  Long Distance Operational Control 
LDS  Lightning.Detection.System 
LDU  Lamp.Driver.Unit 
LE  Link.Establish 
LED  Light.Emitting.Diode 
Leg  The section of the flight between two waypoints. 
LEO  Low Earth Orbiting 
LF  Low Frequency. The frequency range from 30 to 
300.kHz. 
LFDS  Large.Format.Display.System 
LFR  Low Frequency Radio Range 
LGA  Low.Gain.Antenna 

LHP  Lightning.HIRF.Protection 
LIB  Left.Inboard 
LIM  Limit 
LIMNATRAN  Limited.North.Atlantic.Regional.Air.Navigation 
LINCS  Long-Haul.Interfacility.Communications.System 
LISN  Line.Impedance.Stabilization.Network 
LLC  Logical.Link.Control 
LLMS  Liquid Level Measurement System 
LLP  Left Lower Plug. Identifies the plug on the rear 
connector.of.an.avionics.unit. 
L/M  List.of.Materials 
LME  Link.Management.Entity 
LMI  Logical.Management.Interface 
LMM  Locator.Middle.Marker..An.NDB.that.is.co-located. 
at.the.same.site.as.the.75.MHz.middle.marker. 
beacon. 
LMP  Left Middle Plug. Identifies the plug on the rear 
connector.of.an.avionics.unit. 
LMT  Local.Mean.Time