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342 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
Prematureremature Descent Alertinglerting
A Premature Descent Alert (PDA) is issued when the system detects that the aircraft is significantly below the normal approach path to a runway.
PDA alerting begins when the aircraft is within 15 nm of the destination airport and ends when the aircraft is either 0.5 nm from the runway threshold or is at an altitude of 125 feet AGL while within 1.0 nm of the threshold. During the final descent, algorithms set a threshold for alerting based on speed, distance, and other parameters.
700600500400300200100Height Above Terrain (
Feet)Distance From Destination Airport (nm) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15PDA Alerting AreaPDA AreaRunwayThreshold
Figur
e 6-67 PDA Alerting Threshold
Five-Hundred Aural Alertlert
The purpose of the aural alert message “Five-hundred” is to provide an advisory alert to the pilot that the aircraft is 500 feet above terrain. When the aircraft descends within 500 feet of terrain, the aural message “five-hundred” is generated. There are no display annunciations or pop-up alerts that accompany the aural message.
190-00494-02 Rev. B Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 343
Hazard Avoidance voidance voidance
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EICAS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
Negativeegative Climb Rateate After Takeoff Alertlert (NCR)
The Negative Climb Rate (NCR) After Takeoff alert (also referred to as “Altitude Loss After Takeoff”) provides alerts when the system determines the aircraft is losing altitude (closing upon terrain) after takeoff. The aural message “Don’t Sink” is given for NCR alerts, accompanied by an annunciation and a pop-up terrain alert on the display. NCR alerting is only active when departing from an airport and when the following conditions are met:
• Height above the terrain is less than 700 feet
• Distance from the departure airport is 2 nm or less
• Heading change from the departure heading is less than 110 degrees
The figure below shows the NCR alerting parameters as defined by TSO-C151b.
1000800600400200Height Above Terrain (
Feet)Altitude Loss (Feet)0 20 40 60 80 100 120 140“DON’T SINK”“SINK”
1000900800700600500400300200100Height Above Terrain (
Feet)Sink Rate (Feet Per Minute)0“DON’T SINK”“SINK”5001000150025003500200030004000
Figure 6-68 Negative Climb Rate (NCR) Alert Criteria
344 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
Systemystem Statustatustatus
During G1000 power-up, TAWS conducts a self-test of its aural and visual annunciations. The system test can also be manually initiated. An aural alert is issued at test completion. TAWS System Testing is disabled when ground speed exceeds 30 knots.
Alert Type
PFD/MFD Alert Annunciation
TAWS Page Annunciation
Aural Message
System Test in Progress
TAWS TEST
None
System Test Pass
None
None
“TAWS System Test OK”
TAWS System Test Fail
TAWS FAIL
“TAWS System Failure”
Table 6-8 TAWS System Test Status Annunciations
Manually testing the TAWS System:
1) Select the TAWS Page.
2) Press the MENU Key.
3) Select Test TAWS and press the ENT Key to confirm the selection.
Figure 6-69 TAWS Page Menu
TAWS continually monitors several system-critical items such as database validity, hardware status, and GPS status. If the terrain/obstacle database is not available, the aural message “TAWS System Failure” is generated along with the TAWS FAIL alert annunciation.
TAWS requires a 3-D GPS navigation solution along with specific vertical accuracy minimums. Should the navigation solution become degraded or if the aircraft is out of the database coverage area, the annunciation TAWS N/A is generated in the annunciation window and on the TAWS Page. The aural message “TAWS Not Available” is generated.
Alert TypePFD/MFD Alert AnnunciationTAWS Page AnnunciationAural MessageNo GPS position Excessively degraded GPS signalNO GPS POSITION“TAWS Not Available”Table 6-9 TAWS Status Annunciation
　
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