Garmin GNC 420AW Pilot's Manual

Also see for GDL 69: Pilot's guide addendum Pilot's guide addendum Activation Instructions Activation Instructions Pilot's guide addendum

Contents

Garmin GNC 420AW Pilot's Manual Manual pdf 51 page image

45Part Four: Section 1HTAWS IntroductionPart Four:HTAWS InterfaceSection 1: IntroductionNOTE: Either the TERRAIN, TAWS (500W-series only),HTAWS, or Terrain Proximity functionality will be availablevia the Terrain page, depending on the installed hardwareand configuration.OverviewGarmin’s Helicopter Terrain Awareness WarningSystem (HTAWS) is an optional feature to increasesituational awareness and aid in reducing controlledflight into terrain. Garmin TAWS satisfies TSO-C194requirements for certification.HTAWS provides visual and aural annunciationswhen terrain and obstacles are a hazard to the aircraft.HTAWS Page with Terrain AlertNOTE: HTAWS-enabled units can be identified byobserving the power-up screens. HTAWS-enabledunits will display “HTAWS” after the model number.HTAWS-enabled units can also be identified by going tothe Terrain page and checking the upper left-corner for“HTAWS.”Operating CriteriaGarmin HTAWS requires the following to operateproperly:• The system must have a valid 3D GPS positionsolution• The system must have a valid terrain/obstacledatabase.LimitationsNOTE: The data contained in the terrain and obstacledatabases comes from government agencies. Garminaccurately processes and cross-validates the data, butcannot guarantee the accuracy and completeness of thedata.HTAWS displays terrain and obstructions relative tothe flight path of the aircraft. Individual obstructionsmay be shown if available in the database. However, allobstructions may not be available in the database anddata may be inaccurate. Never use this information fornavigation.Terrain information is based on terrain elevationdata contained in a database that may containinaccuracies. Terrain information should be used as anaid to situational awareness. Never use it for navigationor to maneuver to avoid terrain.HTAWS uses terrain and obstacle information sup-plied by government sources. The data undergoes veri-fication by Garmin to confirm accuracy of the content.However, the displayed information should never beunderstood as being all-inclusive.190-00356-30 Rev H