Garmin G1000 Pilot’s Guide for the Piper PA-32 Saratoga
190-02692-00 Rev. A
334
HAZARD AVOIDANCE
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
FORWARD LOOKING TERRAIN AVOIDANCE (FLTA)
The Forward Looking Terrain Avoidance feature of TAWS-B compares the aircraft’s projected flight path
with known terrain and obstacles in their respective databases and issues four types of alerts as either a
caution or a warning:
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 in the following figure. When an RTC alert is issued, a potential impact point is displayed
on the MAP - TAWS-B Page.
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-B Page. The alert is annunciated when the
projected vertical flight path is calculated to come within minimum clearance altitudes in the following figure.
Required Terrain Clearance
0
100
200
300
400
500
600
700
800
0
5
10
15
20
25
30
Distance From Runway (NM)
R
eq
ui
red
T
er
rai
n C
lear
an
ce (
FT
)
RTC Level (FT)
RTC Descending (FT)
Figure 6-71 FLTA Minimum Terrain and Obstacle Values
FLTA alerts are automatically inhibited when the aircraft is less than 200 feet above the destination runway
elevation while within 0.5 nm of the approach runway or the aircraft is between runway ends.
PREMATURE DESCENT ALERTING
A
Premature Descent Alert (PDA)
is issued when the system detects the aircraft is significantly below the
normal approach path to a runway.
PDA alerting begins when the aircraft is below 700 feet AGL within 15 nm of the destination airport and
ends when the aircraft is 0.5 nm from the runway threshold.
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