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determine whether the entry required and the heading displayed
are relative to True or Magnetic North. When the heading is
entered, it will be sent to all IRS sensors in the ATT mode.
Inertial sensors will accept latitude/longitude position information
from the FMS only while in the alignment mode; that is, during the
FMS initialization procedure. Manually updating the inertial sensor's
position information while enroute is not necessary. The IRS position
coordinates are displayed by the FMS for comparative purposes only.
IRS Deselect/Reselect
1. Access the IRS Status page by pressing the DATA function key
and then pressing any [IRS #] line select key.
2. Press the appropriate [DESEL #] or [SELECT #] line select key
to deselect or select the desired IRS. When an IRS is
deselected, the appropriate IRS STATUS field will indicate (D).
When an IRS is selected, the appropriate IRS STATUS field will
indicate either NAV, ALIGN, ATT, or FAIL.
Example: IRS 1 is deselected by system no. 1: IRS 1 does not shut
off, quit navigating, or stop supplying data. System 1 simply
disregards the IRS 1 inputs in its own best computed position
computations. The FMS no. 2 system would continue to utilize the
inputs from IRS 1 in computing its latitude/longitude position.
Deselection of a sensor by any or all FMSs never shuts down that
sensor or causes it to cease its own position computations.
Section VII
Sensors & Interfaces
2423sv602 7-25
Change 1
GPS/IRS Sensors
GPIR# Page 1/3 - Status
This page is accessed from DATA Page 2, and provides data on the
GPS and IRS sensors.
STATUS (IRS)
• NAV - IRS has correctly aligned and is in NAV
• ALIGN - IRS is in alignment mode
• FAIL - No ARINC 429 data received fromGPIRS, or else
GPIRS is sending FAIL status on 429 bus
• ATT - IRS is in ATTITUDE mode. Sensor will not be used for
navigation.
STATUS (GPS)
• HYB - Navigation mode is using hybrid position from IRS and
GPS
• NAV - GPS position alone is being used without IRS aiding
• ALT - Altitude aiding mode (ADC altitude being used to
supplement poor satellite geometry)
• INIT - GPS/IRS is initializing position
• ACQ - GPS is acquiring satellites for navigation
• TEST - GPS is in test mode
• FAIL - GPS has failed, or no 429 data is being received.
This page will also show number of satellites being tracked, as well
as the North and East component velocities from the IRS, GPS,
FMS and HYBrid IRS/GPS.
Section VII
Sensors & Interfaces
7-26 2423sv602
Change 1
SET HDG [1R] - IRS heading may be initialized by entering a
heading in this field. The value entered is displayed and transmitted
on ARINC 429 label 043 for 12 seconds then dashes are displayed
in the field again and label stops transmitting. Used for setting IRS
heading when in ATT mode. Will indicate ° for magnetic and T for
true heading.
The GPS and IRS can be independently SELECTed or
DESELECTed from this page.
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 2 nm enroute, 1 nm terminal or 0.3
nm approach.
Section VII
Sensors & Interfaces
2423sv602 7-27
Change 1
GPIR# Page 2/3 - Comparison
This page is similar to DATA 3/5, but only HYBrid, GPS and IRS
positions are shown for comparison to FMS position. Pressing a line
select key next to GPS, HYB or IRS will display that position in the
upper right hand fields, and show the difference from the FMS
position.
GPIR# Page 3/3 - Diagnostics
This page shows contents of ARINC 429 labels from GPIRS as
shown in left hand column. Data is in hexadecimal, and is for
diagnostic purposes only.
Section VII
Sensors & Interfaces
7-28 2423sv602
Change 1
LCS-850 Loran C Sensor
The LCS-850 status page displays the navigational status of the
LCS (Loran C Sensor). The page will not be available for display if
no LCS is installed. LCS-850 is automatically deselected for ground
　
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