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Clockwise rotation of knob tilts the antenna upward to + 15° and counterclockwise
rotation of knob tilts antenna downward to - 15°. When the TILT knob is pulled out to
the Altitude Compensated Tilt position (Pull ACT), the antenna tilt is automatically
adjusted with regard to selected range and barometric altitude. The tilt control can fine
tune the tilt setting by ± 2°. When in ACT, an A symbol will appear following the
digital tilt readout.
TILT MANAGEMENT
The pilot can use tilt management techniques to minimize ground clutter when
viewing weather targets.
Assume the aircraft is flying over relatively smooth terrain that is equivalent to sea
level in altitude. The pilot must make adjustments for the effects of mountainous
terrain.
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-30 For Training Purposes Only
Sept 04
The following figure helps to visualize the relationship between tilt angle, flight
altitude, and selected range. It shows:
• Distance above and below aircraft altitude that is illuminated by the flat-plate
radiator during level flight with 0° tilt
• Representative low altitude situation, with the antenna adjusted for 2.8° up-tilt
LSS TILT
CLR
TST
OFF
SBY LX
PULL
ACT
+
–
GX_16_037
SAT
GSPD
-56
TAT
TAS
-40
234
345
TOC KLM
DEF GHJ
4000 4000
FL180
Annunciation
TGT
LX OFF
T5.0
GMAP
T5.0 A
Altitude Compensated Tilt
ZERO TILT
7,400 FT
7,400 FT
5.6°
80,000
10,000
20,000
30,000
50,000
60,000
70,000
0
0 25 50 100
14,800 FT
14,800 FT
CENTER OF RADAR BEAM
29,000 FT
29,000 FT
ELEVATION IN FEET
RANGE NAUTICAL MILES
7,400 FT
7,400 FT
30,000
10,000
20,000
0
0 20 40
CENTER OF RADAR BEAM
ELEVATION IN FEET
RANGE NAUTICAL MILES
40,000
5,000
5.6°
3,000 FT
3,000 FT
ANTENNAADJUSTED
FOR 2.8° UPTILT
10 30 50 60 70 80
14,800 FT
14,800 FT
For Training Purposes Only
Sept 04
16-31
P I LOT T R A I N I N G GU I D E
NAVIGATION
The following figure gives the approximate tilt settings at which ground targets begin
to be displayed on the image periphery for an 18-inch radiator. The range at which
ground targets can be observed is affected by the curvature of the earth, the distance
from the aircraft to the horizon, and altitude above the ground. As the tilt control is
rotated downward, ground targets first appear on the display at less than maximum
range.
To find the ideal tilt angle after the aircraft is airborne, adjust the TILT control so that
groundclutter does not interfere with viewing of weather targets. Usually, this can be
done by tilting the antenna downward in 1° increments until ground targets begin to
appear at the display periphery. Ground returns can be distinguished from strong storm
cells by watching for closer ground targets with each small downward increment of
tilt. The more the downward tilt, the closer the ground targets that are displayed.
When ground targets are displayed, move the tilt angle upward in 1° increments until
the ground targets begin to disappear. Proper tilt adjustment is a pilot judgment, but
typically the best tilt angle lies where ground targets are barely visible or just off the
radar image.
The figure gives the approximate tilt settings required for different altitudes and
ranges. If the altitude changes or a different range is selected, adjust the tilt control as
required to minimize ground returns.
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-32 For Training Purposes Only
Sept 04
Tilt angles shown are approximate. Where the tilt angle is not listed, the operator must
exercise good judgment.
NOTE
The line of sight distance is nominal. Atmospheric conditions and
terrain affect this value.
ALTITUDE
RANGE
TILT
40,000
35,000
30,000
25,000
20,000
15,000
10,000
5,000
4,000
3,000
2,000
1,000
246
230
213
195
174
151
123
87
78
67
55
39
-8
-8
-7
-7
-6
-6
-5
-12
-11
-10
-9
-8
-7
-6
-5
-5
-5
-4
-13
-11
-10
-8
-6
-6
-5
-5
-4
-13
-9
　
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