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Alert Type
PFD/MFD Alert Annunciation
MFD Pop-Up Alert
Aural Message
Excessive Descent Rate Warning (EDR)
“Pull Up”
Reduced Required Terrain Clearance Warning (RTC)*
or
“Terrain Ahead, Pull Up; Terrain Ahead, Pull Up”*
or
“Terrain, Terrain; Pull Up, Pull Up”
Imminent Terrain Impact Warning (ITI)*
or
“Terrain Ahead, Pull Up; Terrain Ahead, Pull Up”*
or
“Terrain, Terrain; Pull Up, Pull Up”
Reduced Required Obstacle Clearance Warning (ROC)*
or
“Obstacle Ahead, Pull Up; Obstacle Ahead, Pull Up”*
or
“Obstacle, Obstacle; Pull Up, Pull Up”
Imminent Obstacle Impact Warning (IOI)*
or
“Obstacle Ahead, Pull Up; Obstacle Ahead, Pull Up”
or
“Obstacle, Obstacle; Pull Up, Pull Up”
Reduced Required Terrain Clearance Caution (RTC)*
or
“Terrain Ahead; Terrain Ahead”*
or
“Caution, Terrain; Caution, Terrain”
Imminent Terrain Impact Caution (ITI)*
or
“Terrain Ahead; Terrain Ahead”*
or
“Caution, Terrain; Caution, Terrain”
Reduced Required Obstacle Clearance Caution (ROC)*
or
“Obstacle Ahead; Obstacle Ahead”*
or
“Caution, Obstacle; Caution, Obstacle”
Imminent Obstacle Impact Caution (IOI)*
or
“Obstacle Ahead; Obstacle Ahead”*
or
“Caution, Obstacle; Caution, Obstacle”
Premature Descent Alert Caution (PDA)
“Too Low, Terrain”
Altitude Callout “500”
None
None
“Five-Hundred”
Excessive Descent Rate Caution (EDR)
“Sink Rate”
Negative Climb Rate Caution (NCR)*
or
“Don’t Sink”*
or
“Too Low, Terrain”
* Alerts with multiple messages are configurable at installation and are installation-dependent. Alerts for the default configuration are indicated with asterisks.
Table 6-6 TAWS Alerts Summary
340 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
Excessive Descent Rateate Alertlert
The purpose of the Excessive Descent Rate (EDR) alert is to provide suitable notification when the aircraft is determined to be closing (descending) upon terrain at an excessive speed. The following figure shows the parameters for the alert as defined by TSO-C151b.
6000550050004500400035003000250020001500100050002000 4000 6000 8000 10000 12000"PULL UP""UP""SINK RATE"Descent Rate (FPM) Height Above Terrain (Feet)
Figur
e 6-66 Excessive Descent Rate Alert Criteria
190-00494-02 Rev. B Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 341
Hazard Avoidance voidance voidance
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EICAS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
Forwardorward Looking Terrain Avoidancevoidancevoidance
The Forward Looking Terrain Avoidance (FLTA) alert is used by TAWS and is composed of:
• 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.
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Cessna Citation Mustang G1000 Integrated Flight Dec(120)
