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(TTFF) of a satellite is less than 75 seconds. Without valid initial data, the GNSSU
performs a search-the-skies acquisition and the TTFF of a satellite is less than
10 minutes. From the acquisition mode, the GNSSU enters the NAV mode
GX_16_005
Power-On
Self-Test
Initialization
Acquisition
Aided
Fault
Altitude Aiding
Nav
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-6 For Training Purposes Only
Sept 04
• Navigation (NAV) Mode – The GNSSU enters the NAV mode when it has
computed a navigation solution that provides position, velocity, and time
measurements. The GNSSU has acquired at least four satellites. The GNSSU
sends GPS position data to the FMS. From the NAV mode the GNSSU enters the
acquisition mode or aided mode
• Aided Mode – The GNSSU enters the aided mode when there is insufficient
satellite and/or altitude information, but external-aided data (inertial velocities
from the FMS) is available to continue to update the NAV filter. While in this
mode, the GNSSU provides valid time outputs. From this mode, the GNSSU
enters the NAV or acquisition mode. It will stay in this mode for a maximum of 5
minutes
• Altitude Aiding Mode – The GNSSU enters the altitude aiding mode if satellite
measurements (less than 4) are not sufficient to maintain integrity or remain in the
NAV mode, yet are sufficient when altitude information is available. This mode
uses altitude data from the ADC to aid the navigation solution and integrity
monitoring during extended periods of insufficient satellite coverage and
geometry. When the calibrated pressure altitude deviation estimate is out of limits,
it reverts to the aided mode. From this mode, the GNSSU enters the NAV or aided
modes
• Fault Mode – The GNSSU enters the fault mode when any faults in the GNSSU is
detected. This mode supersedes all other modes. Any fault will be reported on the
FMS CDU. The FMS MSG indicator will illuminate and GPS 1 (2) FAILED
message will appear in the FMS scratchpad
GPS 1 FAILED
For Training Purposes Only
Sept 04
16-7
P I LOT T R A I N I N G GU I D E
NAVIGATION
GPS Access
To access the GPS on the FMS CDU, proceed as follows:
COMPARE FUEL QUANTITY
0VOR/DME T.O.INIT0
00OOOPOS SENSORS 2/2
0BOW PASS/@ LB0
0/170
0IRS 1
KPHX
SJI
ABQ
0FMS POS
POSIT INITO
STATUSO
UPDATEO
IIIN33°06.6 W112°02.3
IIIN33°26.6 W112°12.1
COMPARE FUEL QUANTITY
0VOR/DME T.O.INIT0
00OOOPOS SENSORS 1/2
0BOW PASS/@ LB0
0/170
0IRS 1
KPHX
SJI
0IRS 2 STATUSO
ABQ
0FMS POS
POSIT INITO
STATUSO
UPDATEO
IIIN33°26.6 W112°12.1
IIIN33°26.6 W112°12.1
IIIN33°26.6 W112°12.1
COMPARE FUEL QUANTITY
0POS SENSORS T.O.INIT0
00OOOO0NAV INDEX 1/2
0BOW PASS/@ LB0
0/170
0WPT LIST
15820 (00+21
0K0P0H0X0001152Z
SJN
0DEPARTURE
15820 (00+15 .75M/10000A
ARRIVALO
ABQ
0FPL LIST
.75M/10000A
TUNEO
DATA LINKO
FPL SELO
COMPARE FUEL QUANTITY
0POS SENSORS T.O.INIT0
00OOOO0NAV INDEX 1/2
0BOW PASS/@ LB0
0/170
0WPT LIST
15820 (00+21
0K0P0H0X0001152Z
SJN
0DEPARTURE
15820 (00+15 .75M/10000A
ARRIVALO
ABQ
0FPL LIST
.75M/10000A
TUNEO
DATA LINKO
FPL SELO
GX_16_006
Press NAV function key
Press POS SENSORS key
Press NEXT function key
COMPARE FUEL QUANTITY
0VOR/DME T.O.INIT0
00OOOPOS SENSORS 1/2
0BOW PASS/@ LB0
0/170
0IRS 1
KPHX
SJI
0IRS 2 STATUSO
ABQ
0FMS POS
POSIT INITO
STATUSO
UPDATEO
IIIN33°26.6 W112°12.1
IIIN33°26.6 W112°12.1
IIIN33°26.6 W112°12.1
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-8 For Training Purposes Only
Sept 04
GPS Status
To view the GPS STATUS 1/2 on the FMS CDU, proceed as follows:
To view the GPS STATUS 2/2 on the FMS CDU, proceed as follows:
GPS STATUS 1/2 displays the following information:
• GPS position
• Groundspeed
• Altitude
• Miles from FMS position
GPS STATUS 2/2 displays the following information:
• Receiver Autonomous Integrity Monitor (RAIM)
• Figure of Merit (FOM)
• Horizontal Dilution of Precision (HDOP)
• Vertical Dilution of Precision (VDOP)
• Time (UTC) and Data
• Operating Mode
• Satellites Tracked
　
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