King Air C90GTi, Pilot Training Manual

Page: 423 / 557

areas of red, yellow or green dot patterns (Fig-
ure 16-160). The color and dot density vary
based on terrain elevation relative to the air-
plane. Magenta coloring is used to indicate
areas where terrain information is unavailable.
The TAWS+ terrain display overlay is avail-
able only on Present Position Map and Arc
formats. Additionally, weather radar and ter-
rain cannot be selected simultaneously on the
same display.
Figure 16-160. Terrain Display
If terrain or obstacle data penetrates the cau-
tion or warning envelopes, then the corre-
sponding aural and visual alerts are generated.
The terrain display will not automatically pop
up on the displays however the TERR line se-
lect key will be highlighted with a cyan box. If
the TERR line select key is pressed, the ter-
rain image will appear automatically scaled at
a 10nm range. This range cannot be changed
as long as the TAWS+ cautions or warnings are
still active.
A feature called the Terrain Advisory Line
(TAL) is used to alert the pilot where the first
aural call out will be heard if the current air-
craft path is maintained. This appears as small
amber arcs between the aircraft present posi-
tion and the terrain (Figure 16-161). Should
the aircraft path be maintained or a climb not
initiated, the first aural alert will occur when
the aircraft position arrives at the TAL arc.
Figure 16-161. Terrain Advisory Line (TAL)
Another TAWS+ feature uses a generic per-
formance model to alert the pilot in situations
where the terrain cannot be climbed over. In-
stead of the usual “PULL UP, PULL UP” call-
outs, the aural alert will be “AVOID
TERRAIN, AVOID TERRAIN”. This indi-
cates a maneuver other than a straight ahead
climb is needed to clear the terrain. Using
judgment of the surrounding environment, this
may involve a climbing right or left turn. If the
terrain display is selected, the “AVOID TER-
RAIN” area will contain a red and black
checkerboard pattern to help further decide
which direction to turn (Figure 16-162).
Figure 16-162. Avoid Terrain Warning
BRT
DIM
4
30.16IN
<
PRESET
VOR1
FORMAT >
FMS1
DTK 251
(6935)
0.
8NM
251
W
30
24
21
ATC1 UTC RAT COM1 COM2
121.800 4336 125.250 14:41 15 o C
<
1
RDR
TERR
<
ET
01:42
TERM
F
50
TERRAIN
0
RADAR ON
TCAS OFF
TFC >
>
TGT
25
BRT
DIM
4
30.16IN
<
PRESET
VOR1
FORMAT >
FMS1
DTK 251
(6935)
0.
8NM
251
W
30
24
21
ATC1 UTC RAT COM1 COM2
121.800 4336 125.250 14:41
15
o
C
<
1
RDR
TERR
<
ET
01:42
TERM
F
50
TERRAIN
0
RADAR ON
TCAS OFF
TFC >
>
TGT
25
1
BRT
DIM
4
30.16IN
<
PRESET
VOR1
FORMAT >
FMS1
DTK 251
(6935)
0.
8NM
251
W
30
24
21
ATC1 UTC RAT COM1 COM2
121.800 4336 125.250 14:41
15 o C
<
1
RDR
TERR
<
ET 01:42
TERM
F
50
ACC -.02
TERRAIN
0
RADAR ON
TCAS OFF
TFC >
>
TGT
25
1
FOR TRAINING PURPOSES ONLY
16-90
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
16
A
VIONICS