Glossary of Acronyms and Abbreviations

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L
Abbrevation
Description
 LAAS  Local Area Augmentation System
 LAD  Local Area Differential
 LAT/LONG  Latitude/Longitude
 LACK  A positive logical response (message)
 LAMOS  Local ARTAS Maintenance and Operational Support
 lb  Pound(s)
 LCM  Late Change Message
 LEO  Low Earth Orbit
 LOA  Letter Of Agreement
 Logical Response  Confirmation to the originating system that the intended recipient of a
 message has received the message to which the logical acknowledgment
 refers and found it acceptable or unacceptable for further processing and/or
 display to the responsible person. The Logical Response does not replace
 any required Operational Response
 LORAN  Long Range Air Navigation System
 LRI  Air Traffic and Airport Administration (H)
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