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If a Weather Alert is detected within ±10° of the aircraft heading, an alert is displayed on the PFD in the Messages Window.
If the antenna tilt is adjusted too low, a weather alert can be generated by ground returns. To avoid unwanted weather alerts, deselect the WX ALRT Softkey..
Figure 6-54 Weather Alert IndicationsWeather Alerts
To activate or deactivate Weather Alerts, select the WX ALRT Softkey. Activating and deactivating also enables or inhibits the alert on the PFD.
Figure 6-55 Weather Alert on PFD
190-00494-02 Rev. B Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 331
Hazard Avoidance voidance voidance
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EICAS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
Ground Mapping and Interpretationnterpretationnterpretation
A secondary use of the weather radar system is for the presentation of terrain. This can be a useful tool for verifying aircraft position. A picture of the ground is represented much like a topographical map that can be used as a supplement to the navigation map on the MFD.
Ground Map mode uses a different gain range than Weather mode. Different colors are also used to represent the intensity levels. The displayed intensity of ground target returns are defined in the table below. Use of the GAIN and TILT controls helps improve contrast so that specific ground targets can be recognized more easily. As previously discussed, the type and orientation of the target in relation to the aircraft affects the intensity displayed.
When the weather radar system is in either the Weather or Ground Map mode, the system automatically switches to Standby mode upon landing.
Ground Map Mode Color
Intensity
B
lack
0 dB
Light blue
> 0 dB to < 9 dB
Yellow
9 dB to < 18 dB
Magenta
18 dB to < 27 dB
B
lue
27 dB and greater
Table 6-4 Ground Target Return Intensity Levels
Operation in Ground Map Mode
1) Select the MODE Softkey.
2) Select the GROUND Softkey to place the radar in Ground Map mode.
3) Select the BACK Softkey.
4) Press the FMS Knob to activate the cursor.
5) Turn the large FMS Knob to place the cursor in the TILT field.
6) Adjust the antenna tilt angle by turning the small FMS Knob to display ground returns at the desired distance.
7) Press the FMS Knob to remove the cursor.
332 Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 190-00494-02 Rev. B
Hazard Avoidance voidance voidance
SYSTEM
OVERVIEW
FLIGHT
AUDIO PANEL EICAS INSTRUMENTS
& CNS
FLIGHT
MANAGEMENT
HAZARD
ADDITIONAL AFCS AVOIDANCE
INDEX APPENDICES FEATURES
6.3 Terrain Awarenesswareness & Warning Systemystem (TAWS) Warning: Do not use TAWS information for primary terrain avoidance. TAWS is intended only to enhance situational awareness. NOTE: Terrain data is not displayed when the aircraft latitude is greater than 75° North or 60° South. NOTE: The data contained in the TAWS databases comes from government agencies. Garmin accurately processes and cross-validates the data but cannot guarantee the accuracy and completeness of the data.
The Terrain Awareness and Warning System (TAWS) is an optional feature to increase situational awareness and aid in reducing controlled flight into terrain (CFIT). TAWS provides visual and aural annunciations when terrain and obstacles are within the given altitude threshold from the aircraft. The displayed alerts and warnings are advisory in nature only.
TAWS satisfies TSO-C151b Class B requirements for certification. Class B TAWS is required for all Part 91 aircraft operations with six or more passenger seats and for Part 135 turbine aircraft operations with six to nine passenger seats (FAR Parts 91.223, 135.154).
TAWS requires the following to operate properly:
• A valid terrain/obstacle/airport terrain database
• A valid 3-D GPS position solution
TAWS uses terrain and obstacle information supplied by government sources. Terrain information is based on terrain elevation information in a database that may contain inaccuracies. Individual obstructions may be shown if available in the database. The data undergoes verification by Garmin to confirm accuracy of the content, per TSO-C151b. However, the displayed information should never be understood as being all-inclusive and data may be inaccurate.
TAWS uses information provided from the GPS receiver to provide a horizontal position and altitude. GPS altitude is derived from satellite measurements. GPS altitude is converted to a mean sea level (MSL)-based altitude (GPS-MSL altitude) and is used to determine TAWS alerts. GPS-MSL altitude accuracy is affected by factors such as satellite geometry, but it is not subject to variations in pressure and temperature that normally affect pressure altitude devices. GPS-MSL altitude does not require local altimeter settings to determine MSL altitude. Therefore, GPS altitude provides a highly accurate and reliable MSL altitude source to calculate terrain and obstacle alerts.
　
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