Tilt Management - Honeywell Primus 880 Pilot's Manual

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 which is
equivalent to sea level in altitude. The pilot must make adjustments for
the effects of mountainous terrain.
The figures below help to visualize the relationship between tilt angle,
flight altitude, and selected range. Figures 5- 4 and 5- 5 show the
distance above and below aircraft altitude that is illuminated by the
flat- plate radiator during level flight with 0_ tilt. Figures 5- 6 and 5- 7
show a representative low altitude situation, with the antenna adjusted
for 2.8_ up- tilt.
80,000
70,000
60,000
ZERO TILT
50,000
30,000
7.9
20,000
10,000
0
0
Radar Beam Illumination High Altitude
80,000
70,000
ZERO TILT
60,000
50,000
30,000
5.6
20,000
10,000
0
0
Radar Beam Illumination High Altitude
A28- 1146- 102- 00
PRIMUSr 880 Digital Weather Radar System
20,000 FT
10,500 FT
10,500 FT
20,000 FT
25 50
RANGE NAUTICAL MILES
12- Inch Radiator
Figure 5- 4
7,400 FT
14,800 FT
14,800 FT
7,400 FT
25 50
RANGE NAUTICAL MILES
18- Inch Radiator
Figure 5- 5
CENTER OF RADAR BEAM
CENTER OF RADAR BEAM
AD- 17717- R1@
41,800 FT
41,800 FT
100
AD- 35693@
29,000 FT
29,000 FT
100
Radar Facts
5-5