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 63 page image

57Part Four: Section 3HTAWS AlertsPilot ActionsIf a HTAWS warning and associated aural are received, the pilot should immediately maneuver the rotorcraftin response to the alert unless the terrain or obstacle is clearly identified visually and determined by the pilot notto be a factor to the safety of the operation.A HTAWS caution alert indicates terrain or obstacle nearby. If possible visually locate the terrain or obstacle foravoidance. A HTAWS warning alert may follow a HTAWS caution unless the aircraft’s path towards the terrain orobstacle is changed.NOTE: Display of terrain and obstacles on the display is supplemental data only. Maneuvering solely by reference to the terrainand obstacle data is not recommended or authorized.HTAWS Alerts SummaryHTAWSAnnunciation Pop-Up Alert Aural Message DescriptionNone “HTAWS System Failure” HTAWS has failedNone None HTAWS has been inhibited by the crew,or the aircraft groundspeed has fallenbelow 30 knots (automatic inhibiting).None “HTAWS Not Available” HTAWS not available.“Caution - Terrain, Terrain” Forward Looking Terrain AvoidanceCaution for Terrain“Warning - Terrain, Terrain” Forward Looking Terrain AvoidanceWarning for Terrain“Caution - Obstacle, Obstacle” Forward Looking Terrain AvoidanceCaution for Obstacle“Warning - Obstacle, Obstacle” Forward Looking Terrain AvoidanceWarning for ObstacleNone None “Five Hundred”“Four Hundred”“Three Hundred”“Two Hundred”“One Hundred”HTAWS provides optional 500 ft through100 ft (in 100 ft increments) altitude callout alerts.NOTE: HTAWS Caution Alerts are displayed as constant black text on a yellow background; HTAWS Warning Alerts are displayed as constant white texton a red background.190-00356-30 Rev H