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Part Four: Section 3
HTAWS Alerts
NOTE: HTAWS Caution Alerts are displayed as
constant black text on a yellow background;
HTAWS Warning Alerts are displayed as constant
white text on a red background.
Forward Looking Terrain Avoidance
The unit will issue terrain alerts not only when the
aircraft altitude is below the terrain elevation but also when
the aircraft is projected to come within minimum clearance
values of the terrain. This alerting, called Forward Looking
Terrain Avoidance (FLTA), is also provided for obstacles.
The FLTA functionality looks ahead of the aircraft using
GPS position information and the terrain and obstacle
databases to provide alerts when the predicted flight path
does not clear the terrain or obstacle by the required
clearance. The amount of clearance required varies
depending on position relative to airports and heliports, in
order to reduce the occurrence of nuisance alerting.
Any potential impact points are depicted on the display.
There are 2 levels of severity for FLTA alerts. They are
cautionary (amber) and warning (red) in nature and are
described in further detail below.
FLTA CAUTION—Estimated potential impact in approximately
30 seconds after a caution pop-up alert and annunciation. FLTA
caution alerts are accompanied by the aural message “Caution
Terrain; Caution Terrain” OR “Terrain Ahead; Terrain Ahead”.
Similarly, a “Caution Obstacle; Caution Obstacle” or “Obstacle
Ahead; Obstacle Ahead” alert is also provided. The time to an
alert can vary with conditions, therefore there is no guarantee
of a 30 second caution alert being issued.
FLTA WARNING— Warning pop-up alerts are issued 15 seconds
prior to an estimated potential impact in normal mode and
approximately 10 seconds in RP Mode. FLTA warning alerts are
accompanied by the aural message “Warning - Terrain, Terrain” .
Similarly, a “Warning - Obstacle, Obstacle” alert is also provided.
The time to an alert can vary with conditions, therefore there is
no guarantee of a 15/10 second warning alert being issued.
The alerts are annunciated visually through the
annunciator status bar, a pop-up alert box, and the red and
yellow X’s on the HTAWS page. The alerts are annunciated
aurally through a voice message indicating the potential
threat, such as “Caution - Terrain, Terrain” or “Warning -
Obstacle, Obstacle”.
Voice Call Out Aural Alert
The purpose of the Voice Call Out aural alert messages
are to provide an advisory alert to the pilot that the aircraft
is between 500 feet and 100 feet above terrain in 100 foot
increments. When the aircraft descends within the selected
distance from the terrain, the aural message for the selected
distance is generated. There are no display annunciations
or pop-up alerts that accompany the aural message.
190-00356-30 Rev L
- 400W / 500W Series 1
- Foreward 2
- Warnings and Cautions 3
- Table of Contents 4
- Part One: 7
- Traffic Information Service 7
- (TIS) Interface 7
- Symbology 7
- How TIS differs from TCAS 8
- TIS Limitations 8
- Improving TIS 9
- TIS Symbology 9
- TIS Operation and Symbology 10
- Part One: Section 1 10
- Part One: Section 2 11
- TIS Controls and Display 11
- Traffic Target Track Vector 12
- Traffic Warning Window 12
- Map Page 13
- Part One: Section 3 15
- Introduction 15
- Power-Up Test 15
- TIS Operational Procedures 15
- Manual Override 16
- Flight Procedures 16
- After Landing 16
- Part Two: 17
- XM Radio Interface 17
- Section 1: Introduction 17
- Section 2: SiriusXM Weather 18
- 190-00356-30 Rev L 19
- Part Two: Section 2 20
- XM Weather 20
- SiriusXM Weather 20
- SiriusXM Weather METARs 23
- TFR Information 25
- Lightning (LTNG) 27
- Cell Movement (CELL MOVE) 27
- Part Two: Section 3 28
- Winds Aloft 28
- The display includes: 28
- Section 3: XM AUX Pages 29
- XM WX Timestamps 30
- Part Two: Section 4 30
- XM Audio 30
- XM Audio Menu 33
- Add to Presets List 33
- Part Three: 37
- TAWS Interface 37
- Section 2: TAWS Operation 38
- Part Three: Section 2 39
- TAWS Operation 39
- Inhibit Mode 39
- TAWS Manual Test 40
- TAWS Symbols 40
- General Database Information 42
- Database Versions 42
- Database Updates 43
- Coverage 43
- Section 3: TAWS Alerts 44
- Part Three: Section 3 45
- TAWS Alerts 45
- “DON’T SINK”“DON’T SINK” 47
- No GPS Position 48
- TAWS FAILED Display 48
- Pilot Actions 50
- Part Four: 51
- HTAWS Interface 51
- Section 2: HTAWS Operation 52
- Part Four: Section 2 53
- HTAWS Operation 53
- Reduced Protection Mode 54
- Mute Active Caution 55
- HTAWS Manual Test 56
- HTAWS Legend 56
- Obstacle Symbol 57
- WARNING (Red) 58
- CAUTION (Yellow) 58
- Part Four: Section 3 59
- HTAWS Alerts 59
- Section 3: HTAWS Alerts 60
- Voice Call Out Aural Alert 61
- HTAWS Not Available Alert 62
- HTAWS Failure Alert 62
- HTAWS Alert Summary 62
- Part Five: 65
- Terrain Proximity Interface 65
- Part Five 66
- Terrain Proximity 66
- Select “Show Legend” 67
- Terrain Proximity Limitations 68
- System Status 68
- Part Six: 69
- Garmin GTS 8XX Series 69
- Interface 69
- Part Six 70
- GTS 800 Interface 70
- Voice Announcements 70
- Drawing Not to Scale 71
- Traffic Page Display Range 72
- Part Seven: 75
- Garmin GDL 88/88D Interface 75
- Section 2: FIS-B Weather 76
- NEXRAD Description 77
- Part Seven: Section 2 77
- Section 3: Traffic 81
- Altitude Display Mode 82
- Part Seven: Section 3 82
- GDL 88 Interface: Traffic 82
- Traffic Page 84
- Traffic On Map Page 84
- Traffic Off-Scale (Map Page) 84
- Altitude Display Modes 84
- Traffic With GDL 88 84
- Traffic Alert Pop-Up 85
- Failure Response 88
- RYAN TCAD 89
- Part Eight: 91
- Garmin Connext Interface 91
- Section 2: Bluetooth Status 92
- View Device Details 93
- Auto-Reconnect 93
- Part Eight: Section 2 93
- Part Eight: Section 3 94
- Unpair Device 94
- Part Eight: Section 4 95
- View User Waypoint List 97
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