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33
30
W
4
E
6
3
20
10
10
20
260
280
300
320
000
900
800
100
200
VOR1
29.96 IN
1/2BNK HDG DR ALTS
AP
1
2
4
1
2
4
240
32
M.765
VOR1 TRAFFIC
CRS
29.4NM
VIN
310
VOR1
TCAS
RA
FAIL
30
ADF2
ALTS PATH GS
32000
NAVIGATION SYSTEMS
17-88 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Self-Test
The TCAS self-test is initiated from the RTU TCAS main page by pushing the TEST
line select key. The following indications should be evident during the test:
• PFD and MFD display “TCAS TEST”
• Each PFD displays flashing red “TRAFFIC” and vertical traffic resolution cue on
the VSI (red/green)
• MFD traffic display shows the TCAS self-test pictorial representation. The display
should show four intruder symbols as follows:
TCAS Test PFD and MFD Indications
Figure 17-61
Successful test completion is indicated by an aural, “TCAS SYSTEM TEST OK”
voice message. An unsuccessful test will give a “TCAS SYSTEM TEST FAIL” aural
message.
BRT
T+10.7
250 SAT 12C
10
LX/WX+TRB
TAS 254
USTB
UTC11:42 GS TAT-15C
FMS2
YUL
G+3
+10
+01
TCAS TEST
RA 2. / 00
TA 4. / -03
0NM
0NM
ABOVE
BELOW
ALT
180
-OFF
-02
-01
TCAS Test
Indicates TCAS test
has been selected
P604_17_044
000
100
200
100
200
29.92 IN
1
2
4
1
2
4
0
TRAFFIC
TCAS
TEST
2700
2
1
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-89
P I LOT T R A I N I N G GU I D E
Global Positioning System (GPS)
Description
The GPS is a space-based navigation system that provides highly accurate threedimensional
position, velocity and time information to ground or aircraft receivers.
The GPS is a sensor used by the flight management system to compute an accurate
position. All GPS data is accessed through the FMS CDU.
The GPS has three main segments:
• space segment
• control segment (ground)
• user segment
Space Segment
The space segment of the GPS is made up of 24 NAVSTAR satellites. There are 21
operational satellites at all times and three are spares. The satellites:
• are in a 10,900-mile-high orbit
• are in six orbital planes with 3 to 4 satellites in each plane
• have a 12-hour orbit
• are spaced to provide a minimum of 4 satellites in view at all times
• have atomic clocks and transmit on two coded frequencies
Control Segment
The control segment monitors the space segment and adjusts the orbits when
operationally required. It includes five ground stations around the world. One is the
master control station and the others are monitor stations.
The monitor stations passively track all satellites in view and acquire range data from
them. This data is forwarded to the master control station. The master control station
uses the data from the monitor stations to estimate satellite orbit and clock data. This
information is transmitted to the satellites and down to the users as a navigation
message.
User Segment
The FMS uses the signal from the GPS satellites as a navigation sensor to upgrade its
own position. A minimum of three satellites is required for two-dimensional
calculations and four satellites are required for three-dimensional calculations.
NAVIGATION SYSTEMS
17-90 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
GPS Receivers
Dual GPS receivers are installed in the Challenger 604 (GPS 1 and GPS 2). The GPS
receivers process signals from the orbiting constellation of GPS satellites to determine
geographic position. Each of the GPS receivers is capable of receiving up to 12
satellites. Tuning is fully automatic, and does not require any pilot input/action.
GPS 1 is powered by DC Bus 1, and GPS 2 is powered by DC Bus 2.
GPS Sensors and Navigation
The flight management system (FMS) is the interface between the GPS receivers and
the aircraft navigation systems. GPS position information is supplied to each FMS by
the on-side GPS receiver (GPS 1 supplies FMS 1, and GPS 2 supplies FMS 2). The
FMS then calculates the integrated navigation solution (FMS position) using a
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