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• Reduced Required Terrrrain Clearance and Reduced Required Obstacle Clearance
Reduced Required Terrain Clearance (RTC) and Reduced Required Obstacle Clearance (ROC) alerts are issued when the aircraft flight path is above terrain, yet is projected to come within the minimum clearance values. When an RTC alert is issued, a potential impact point is displayed on the TAWS Page.
• Imminent Terrrrain Impact and Imminent Obstacle Impact
Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) alerts are issued when the aircraft is below the elevation of a terrain or obstacle cell in the aircraft’s projected path. ITI and IOI alerts are accompanied by a potential impact point displayed on the TAWS Page. The alert is annunciated when the projected vertical flight path is calculated to come within minimum clearance altitudes in the table.
Flight Phase
Minimum Clearance Altitude (ft)
Level Flight
Descending
Enroute
700
500
Terminal
350
300
Approach
150
100
Departure
100
100
Table 6-7 FLTA Alert Minimum Terrain and Obstacle Clearance Values
During final approach, FLTA alerts are automatically inhibited when the aircraft is below 200 feet AGL while within 0.5 nm of the approach runway or below 125 feet AGL while within 1.0 nm of the runway threshold.
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.
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Cessna Citation Mustang Pilot’Guide 2(20)
