King Air C90GTi, Pilot Training Manual

Page: 418 / 557

Antenna Stabilization
Antenna stabilization is achieved by referenc-
ing the AHRS system. This way, the antenna
sweep will maintain a constant angle relative
to the earth’s surface as the aircraft’s pitch and
bank change. This eliminates ground returns
when banking the aircraft and allows for a pre-
cise left and right sweep.
GCS Button
The GCS button controls ground clutter sup-
pression. When selected, the system sup-
presses ground returns (clutter) in the Wx
mode to help identify precipitation targets.
GCS is only active for 30 seconds. GCS an-
nunciates on the PFD and MFD when the
radar mode is on and the GCS button has
been pressed (Figure 16-153).
TILT Control
The TILT knob controls the antenna tilt angle.
The selected angle (–15 to +15 degrees) is dis-
played with the letter T on the displays (Fig-
ure 16-154). Since each pilot has a tilt control
the radar produces an image on only one
sweep. This enables the pilot’s tilt to be shown
on the clockwise sweep while the copilot’s tilt
can be shown on the counterclockwise sweep.
PUSH AUTO TILT Button
The PUSH AUTO TILT button located in the
center of the TILT / RANGE knob selects au-
tomatic antenna tilt control. The letter “A” ad-
jacent to the tilt angle indicates that auto-tilt is
selected. The auto tilt function compensates
for airplane altitude changes and range
changes by adjusting the tilt angle to maintain
the selected reference to ground. This will
cause the tilt number to change when climb-
ing or descending, or changing the range.
RANGE Knob
The RANGE knob controls the scanning
range shown on the MFD map and radar pic-
torial. Range annunciations are shown on the
displays as discussed earlier.
16-85
FOR TRAINING PURPOSES ONLY
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
16
A
VIONICS
Figure 16-153. Radar Ground Clutter Supression
Collins
BRT
DIM
FMS
DTK 251
( 6 9 3 5)
TTG
0.
8NM
251
W
30
24
21
TAS SAT GS ISA
0 0
+13 o C 15 o C
<
<
RDR <
TERR
50
WX
0
0.0
ITT
26
TORQ
0
FF
PRESS
OIL
TEMP o C
0
0
46
430
120
73
N I 98.5
PROP
1980
TORQ
2000
ITT
734
AFX
RW25
( 6 9 3 5)
SXW152
KBJC
0 . 0NM
0 . 8NM
4 . 4NM
198NM
- : - -
- : - -
- : - - - : - - / 0 . 8NM :
:
:
:
25
T+5.7
FMS DR
RLG
-- : --
FIRE
TFC <
ABOVE
<
:
:
:
: 0 . 0NM
0 . 8NM
4 . 4NM
198NM
Collins
BRT
DIM
FMS
DTK 251
( 6 9 3 5)
TTG
0.
8NM
251
W
30
24
21
TAS SAT GS ISA
0 0
+13 o C 15 o C
<
<
RDR <
TERR
50
GCS
0
0.0
ITT
26
TORQ
0
FF
PRESS
OIL
TEMP o C
0
0
46
430
120
73
N I 98.5
PROP
1980
TORQ
2000
ITT
734
AFX
RW25
( 6 9 3 5)
SXW152
KBJC
0 . 0NM
0 . 8NM
4 . 4NM
198NM
- : - -
- : - -
- : - - - : - - / 0 . 8NM :
:
:
:
25
T+5.7
FMS DR
RLG
-- : --
FIRE
TFC <
ABOVE
<
:
:
:
: 0 . 0NM
0 . 8NM
4 . 4NM
198NM