King Air C90GTi, Pilot Training Manual

Page: 383 / 557

process will be repeated until the aircraft lev-
els at the altitude shown on the preselector.
The aircraft is not allowed to go beyond the
preselector setting.
GLOBAL POSITIONING
SYSTEM (GPS)
The global positioning system (GPS) provides
worldwide navigation via signals received
from orbiting satellites. The GPS receiver is lo-
cated in the nose avionics bay and is labeled
GPS-4000(s). Using an antenna mounted on
the top of the fuselage, it will track and moni-
tor up to 12 satellites to provide a three di-
mensional position for the FMS and the
Terrain Awareness and Warning System
(TAWS). The GPS 1 and optional GPS 2 sys-
tems are controlled by the CDU(s).
The FMS’s will default to GPS navigation
sources as the primary reference for their po-
sition. Whether they are still enabled and part
of the navigation can be seen with a few pages
in the CDU Index (IDx) page. The GPS Con-
trol page will indicate whether the GPS sen-
sors are enabled for navigation use, and will
indicate the difference between the GPS posi-
tion and the calculated FMS position (Figure
16-89). The PROGESS page on the CDU dis-
plays the current navigation sources used by
the FMS to determine current position (Fig-
ure 16-90). The PROGRESS page shows a
label on the bottom titled NAVIGATION. In
this example the NAVIGATION area indi-
cates that the system is using VOR, DME and
GPS. Should the GPS malfunction or lose its
Receiver Autonomous Integrity Monitoring
(RAIM) the GPS label would be removed
from the NAVIGATION line. If the GPS por-
tion of the position begins to malfunction, a
message will appear on the CDU. Some ex-
amples of GPS messages are as follows:
Figure 16-89. GPS CONTROL
Figure 16-90. PROGRESS
EXEC
NEXT PREV
MFD
DATA
MFD
ADV
CLR
DEL
BRT
DIM
DEP
ARR
PERF LEGS FPLN DIR
MSG
TUN
IDX
MFD
MENU
A B C D F G
H I J K L M
O P Q R T U
V X Y Z
SP
/
E
N
S
W
1 2 3
4 5 6
7 8 9
+ -
/
0
/
GPS CONTROL
GPS1 <ENABLED>
[ [
322 /0.4
KDEN
POS DIFF
<INDEX
/
DEST ETA
SAT DESELECT
APPR RAIM
12:16 AVAILABLE
GPS2 <ENABLED> 322 /0.3 /
--
------------------------
EXEC
NEXT PREV
MFD
DATA
MFD
ADV
CLR
DEL
BRT
DIM
DEP
ARR
PERF LEGS FPLN DIR
MSG
TUN
IDX
MFD
MENU
A B C D F G
H I J K L M
O P Q R T U
V X Y Z
SP
/
E
N
S
W
1 2 3
4 5 6
7 8 9
+ -
/
0
/
PROGRESS
KIRLE
LAST
TO
[
[
NEXT
ETE
1/2
DIST
KDEN
VOR/DME1 GPS
NAVIGATION
DEST
ALTN
FUEL-LB
DBL
BASEE
2.3 0
19.6 0:04 2440
72.3
193
0:16
0:42
2300
1980
/
/
/
//
/
/ /
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KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
FOR TRAINING PURPOSES ONLY
16-50
16
A
VIONICS