iIntroductionIntroductionWelcome ...Welcome to a new era of aviation communication. Once again, Garmin AT, Inc. has set new standards infeatures and ease of use for the general aviation public. The SL40 is a VHF Communications Transceiver foruse by the aviation pilot. Packaged in a new slim form factor that helps you get the most out of limited panelreal estate without limiting features and performance. The SL40 is unequaled in providing the features, level ofperformance, and reliability that aviation users expect. The slim line series of avionics sets a precedent that willbe the standard that all other avionics will be compared to. You can be confident in knowing that you are theowner of the state-of-the-art in aviation communication. Our products are built to last and to allow for upgrad-ing as your needs change in the future.The SL40 is also packaged in configurations to meet the needs of customers for base station and mobile ap-plications. Contact the Garmin Customer Support for more details.History of RevisionsDecember 1996 Original ReleaseMarch 1997 Rev. -01June 1998 Rev. -02September 2003 Rev. -02 AApril 2004 Rev -02 BMay 2005 -02 Rev CJanuary 2009 -02 Rev DApril 2010 -02 Rev ESeptember 2011 -02 Rev FOrdering InformationTo receive additional copies of the SL40 User’s Guide, order Garmin AT part #560-0954-02 Rev F (GarminP/N 190-00488-00 Rev A). The SL40 Installation Guide is Garmin AT part #560-0956-xx.