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the GPS will continue to navigate with four satellites
tracked.
Pilot notifications of GPS sensor problems are for the GPS sensor,
which is currently being used by the FMS for navigation. This
notification is in the form of a GPS Integrity annunciator, the FMS
Nav Flag (Approach Lateral Valid Flag), and FMS messages. The
GPS Integrity annunciator FMS discrete output is used to light an
external annunciator.
Section VII
Sensors & Interfaces
7-18 2423sv602
Change 1
The following table lists the FMS/NMS navigation status and
associated pilot actions to be taken when the “GPS INTEG”
annunciator is active.
Flight
Phase
NAV Flag
condition
GPS
“NOT NAV”
message
“POSITION
UNCERTAIN”
Message
Pilot Action
Valid
Not Issued
Not Issued
Normal
systems
cross-checks
Oceanic/
Remote
Enroute
Valid Active
(DR Nav Mode)
Not Issued
(Q=<6.0nm)
Use most
reliable Nav
source
Valid Active
(DR Nav Mode)
Active
(Q=>6.0nm)
Use other
Nav system
Valid
Not Issued
Not Issued
Normal
systems
cross-checks
Domestic
Enroute
Valid Active
(DR Nav Mode)
Not Issued
(Q=<2.8nm)
Use most
reliable Nav
source
Valid Active
(DR Nav Mode)
Active
(Q=>2.8nm)
Use other
Nav system
Valid
Not Issued
Not Issued
Normal
systems
cross-checks
Terminal
Valid
Active
(DR Nav Mode)
Not Issued
(Q=<1.0nm)
Use most
reliable Nav
source
Valid Active
(DR Nav Mode)
Active
(Q=>1.0nm)
Use other
Nav system
Valid
Not Issued
Not Issued
Do not
continue
Approach
before FAF
Invalid if
<2nm from
FAF or Integ
= Alarm
Not Issued
Not Issued
Approach
based upon
GPS alone.
Use other
Nav
Approach
after FAF
Invalid if
Integ=NONE
for >5 min or
Integ=Alarm
Not Issued
Not Issued
sources.
Section VII
Sensors & Interfaces
2423sv602 7-19
Change 1
GPS Status
• NAV - GPS is in NAV mode.
• ACQ - GPS is acquiring satellites.
• INIT - GPS is initializing its position from internal
almanac.
• ALT - GPS is using altitude to supplement poor satellite
geometry.
• TEST - GPS is in TEST mode.
• FAIL - GPS has failed, or 429 data not received from
GPS.
GPS Q factors - These are error estimates in tenths of nautical
miles (i.e., a Q factor of 01 is equal to 0.1 nm circular error estimate).
# SATELLITES - The number of satellites currently being tracked by
the GPS.
This page shows ARINC 429 data on labels 273 and 277 from the
GPS sensor. The operator may enter a five-digit hex address in the
ADDRESS field to view four-digit hex data in DATA field. This page
is to be used for diagnostics and troubleshooting. HDOP and VDOP
are for reference only. Label 277 will be dashed if a GPS-1200 or a
UNS 764-2 is installed.
Section VII
Sensors & Interfaces
7-20 2423sv602
Change 1
SELECT/DESELECT GPS - Used to manually select or deselect the
GPS sensor.
INTEG - GPS Integrity status is displayed on this line and defined
below.
• RAIM - Receiver Autonomous Integrity Monitoring (only
displayed with a RAIM capable GPS).
• RADIO - Radio based (i.e., DME-DME) integrity
monitoring.
• NONE - No integrity monitoring available. GPS position
accuracy is not affected and will continue to be
used for navigation. However, the pilot should
monitor the FMS accuracy by comparing to other
nav sources, if available.
• ALARM - Integrity monitoring indicates a GPS error outside
limits.
HIL - Horizontal Integrity Limit in nautical miles. RAIM is available
when HIL is equal to or less than 2nm enroute, 1nm terminal or
0.3nm approach.
HDOP - Horizontal Dilution of Precision.
VDOP - Vertical Dilution of Precision.
VER - The internal GPS software version.
Section VII
Sensors & Interfaces
2423sv602 7-21
Change 1
INTERNAL GPS, GPS-950 AND GPS-1000
INTERNAL GPS, GPS-950 AND GPS-1000
The above two pages are applicable for the internal GPS, GPS-950
and GPS-1000. They may appear with other GPSs but will not be
functional. These pages display the twelve satellites most likely to
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