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combination of GPS, DME/DME, VOR/DME, and IRS sensor information.
In the event that on-side GPS information is not available, the FMS will automatically
use cross-side information, and display the GPS REVERTED message on the FMS
CDU.
GPS RAIM
GPS Receiver Autonomous Integrity Monitoring (RAIM) is used to assure that the
GPS position information meets the required accuracy:
• 4 NM oceanic/remote
• 2 NM en route
• 1 NM terminal
• 0.3 NM final approach
The current RAIM accuracy limit and measured accuracy limit are displayed on the
MFD LRN STATUS page 2/2. The measured accuracy limit indicates the maximum
estimated error based on measurement inconsistency. Unless an error is detected by
RAIM, this value is always less than the RAIM accuracy limit.
When an error is detected, it is annunciated on the MFD LRN STATUS page 2/2. If the
detected error cannot be predicted to be less than the required integrity threshold, GPS
is removed from the navigation solution.
If no error is detected by RAIM, the probable GPS error is shown. This is a statistical
number based on normal satellite error characteristics.
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-91
P I LOT T R A I N I N G GU I D E
MFD LRN STATUS (Page 2/2)
Figure 17-62
P604_17_092
LRN STATUS
SENSOR POSITION TRK/SPD
2/2
GPS 1
N33°40,87 W116°59,50 071°/405
MODE: NAV
RAIM ACCURACY LIMIT:
MEAS ACCURACY LIMIT:
PROBABLE ERROR:
SATELLITES: 8
0.10 NM
0.10 NM
0.05 NM
0
00
00
00
GPS 2
N33°40,87 W116°59,50 071°/405
MODE: NAV
RAIM ACCURACY LIMIT:
MEAS ACCURACY LIMIT:
PROBABLE ERROR:
SATELLITES: 8
0.10 NM
0.10 NM
0.05 NM
0
00
00
00
LRN STATUS
SENSOR POSITION TRK/SPD
2/2
GPS 1
N53°43,30 W000°12,30 315°/254
MODE: NAV
RAIM ACCURACY LIMIT:
MEAS ACCURACY LIMIT:
PROBABLE ERROR:
SATELLITES:12
0.41 NM
0.23 NM
0.04 NM
00
00
00
GPS 2
N53°43,30 W000°12,30 315°/254
MODE: NAV
RAIM ACCURACY LIMIT:
MEAS ACCURACY LIMIT:
RAIM DETECTED ERROR
SATELLITES: 7
0.41 NM
0.46 NM
0
00
00
000.05 NM
NORMAL RAIM INDICATIONS RAIM DETECTED ERROR ON GPS 2
NAVIGATION SYSTEMS
17-92 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
In the terminal environment, RAIM accuracy is indicated by the white TERM message
below the NAV SOURCE display of the PFD.
On final approach, RAIM accuracy is indicated by the white GPS APPR message
below the NAV SOURCE display of the PFD.
If RAIM accuracy does not reach final approach tolerances, the yellow NO APPR
message is displayed below the NAV SOURCE display of the PFD.
PFD RAIM Indications
Figure 17-63
N
33
30
W
24
21
6
3
VOR1
FMS 1
DTK
1.8NM
MOSSY
310
VOR2
NO APPR
MSG
P604_17_093
RAIM Not In
Approach
Tolerance
Message
N
33
30
W
24
21
6
3
VOR1
FMS 1
DTK
1.8NM
MOSSY
310
VOR2
GPS APPR
MSG
N
33
30
W
24
21
6
3
VOR1
FMS 1
DTK
6.4NM
MOSSY
310
VOR2
TERM
MSG
Terminal
RAIM
Message
Approach
RAIM
Message
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-93
P I LOT T R A I N I N G GU I D E
For a complete listing of GPS and RAIM messages, see the “Collins FMS-6000 for the
Challenger 604” Pilot’s Guide.
FMS CDU RAIM Message
Figure 17-64
P604_17_091
MSG EXEC
POS BRT
TITLE LINE 1/3
PRED RAIM
CYYZ
CYOW
RW06L
ACTIVATE>
CYUL
GPS 2 <ENABLED>
RJ001
DIRECT
<ROUTE MENU
DEST
ALTN
ORIG RWY
ETA
R1
ORIGIN
ROUTE
FLT NO
VIA
DEST
L
SEC FPLN 1/3
[ ]
<SEC LEGS
ATC 1
YUL
TO
ATC 2
SEC PERF>
AVAIL
NO GPS RAIM
FMS-CDU RAIM Message
NAVIGATION SYSTEMS
17-94 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Controls and Indicators
FMS-GPS Control Page
The GPS control page allows the pilot to monitor the FMS aircraft position in relation
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