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be in current use by the GPS. Each line displays SV# (Satellite
Vehicle Number), Azimuth (deg), Elevation (deg), Signal to Noise
Ratio (SNR) and STATus. (Azimuth will always be true direction from
the aircraft). Elevation is in degrees above the horizon (90° is
directly overhead the aircraft position). EL may be negative,
indicating a satellite below the horizon. SNR is a number from 0 to
63 in dB Hz.
Section VII
Sensors & Interfaces
7-22 2423sv602
Change 1
Status is a number from 0 to 9 and is defined as follows:
Status Definition
0 - Satellite is assigned to a channel
1 - FIND command issued
2 - Waiting to receive almanac and ephemeris data
3 - Waiting to receive complete pseudo range data block
4 - Performing the acquisition/tracking process
5 - Fast sequencing of satellite signal (tracking mode)
6 - Satellite is not assigned to a channel
7 - Lost satellite lock during sequencing process
8 - Waiting for clock message
9 - Satellite not found
INTERNAL GPS AND GPS-1000 ONLY
This page is accessed using the PREV or NEXT key from other GPS
Status pages. This page applies to the internal GPS and the GPS-
1000. It may appear with other GPSs but will not be functional.
This page displays GPS satellites which have been deselected.
In addition to displaying a list of deselected satellites, this page is
also use to manually select or deselect satellites.
A list of satellites appears showing the satellite vehicle (SV) number
and the status of each. Status is shown as DES (deselected), REQ
(requested for deselection by the FMS) or AUTO (automatically
deselected by the GPS).
The crew can deselect a satellite by pressing line select key [1R] to
bring the cursor over the DESEL SV# field. The satellite vehicle
number is typed in at the cursor location and entered by pressing the
ENTER key. The list status will read REQ until the GPS
acknowledges the deselection at which time the status becomes
DES.
Section VII
Sensors & Interfaces
2423sv602 7-23
Change 1
The crew can reselect a satellite by pressing line select key [3R] to
bring the cursor over the SELECT SV# field. The satellite vehicle
number is typed in at the cursor location and entered by pressing the
ENTER key. The satellite will be removed from the list once the
GPS acknowledges.
Inertial Reference Sensor (IRS)
Inertial sensors will accept latitude/longitude position information
from the FMS only during their alignment mode, i.e., during the
initialization procedure.
During initialization, all inertial sensors, which are in the alignment
mode, will accept latitude/longitude position information from either
FMS. This is true regardless of whether or not both FMS systems
are ON, only one is ON, or if one is failed. While in the alignment
mode, all inertial sensors will use the last position update they
receive from either FMS for their alignment point. Once in the Nav
mode, no inertial sensor will accept an update. Manually updating
the inertial’s position while enroute is not necessary.
Battery protection of inertial sensors negates the need for a position
information update following a power failure.
The IRS Status page displays the status of the installed IRS(s)
(Inertial Reference System). This page is accessed from DATA
page 2.
STATUS - This is the operational status of the IRS. The status
displayed will be one of the following:
• ALIGN indicates that the IRS is in the alignment process. The
aircraft should not be moved.
• NAV indicates the IRS is in the normal navigational mode.
• ATT indicates the IRS is available for attitude outputs only.
Navigational outputs are not being provided.
• FAIL indicates the unit is not operational.
Section VII
Sensors & Interfaces
7-24 2423sv602
Change 1
HDG - The true heading received by the navigation computer from
the IRS. Dashes are displayed if no valid data is available.
VELOCITY - Position movement broken into N-S/E-W velocity
components.
FMS - The FMS best computed position velocity components.
IRS# - The velocity components being received by the navigation
computer from that IRS.
SET HDG - For use with a Laser-type IRS when selected to
ATTITUDE on the IRS Mode Selector Unit. In the ATTITUDE mode,
the Laser IRS will output both attitude and heading. The heading
output is similar to uncorrected DG; that is, it must be manually set
once.
1. Press the [SET HDG] line select key to position the cursor over
the SET HDG entry field.
2. Enter the desired heading. The TRUE/MAG panel switch will
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