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one another. Remember, the "DIFF' values shown will all be large,
but they are showing the difference from each IRS's position to the
possibly contaminated FMS position. This is not what we are
looking for. We're interested in seeing if the raw coordinates for
IRS1 are close to IRS2 and close to IRS3. (The DIFF values can be
used to assist in this process if it is realized that we are looking for
similarity instead of absolute values.) After finding that all three IRSs
are geographically close (allowing for normal errors), it can be
assumed that the OSS is indeed the sensor which is pulling the FMS
position away.
The proper corrective action would be to access the OSS Status
page to deselect OSS 1 and then update the FMS position to the
same latitude/longitude as any one of the IRS positions. The three
IRS DIFF WARN messages should then disappear.
Example 2: The aircraft is flying in a non-DME environment with two
long range nav sensors feeding the FMSs. A message becomes
active saying one of them is drifting (i.e., "OSS1 DIFF 6nm" or "LCS
DIFF 6NM" or "IRS1 DIFF WARN").
This is a tougher situation and requires a judgment call. Using the
"General Rule" described above as a guide; an evaluation must be
made to determine which sensor is in error.
Upon determining the problem sensor, deselect it or update it and
consider updating the FMS best computed position. The message
active on the screen may not indicate the problem sensor as it is
based on the priority conventions outlined above. It remains the
pilot’s responsibility to verify the validity of the error messages.
Section VI
Special Missions
2423sv602 TOC-i
Change 1
TABLE OF CONTENTS
SPECIAL MISSIONS...................................................................... 6-1
Section VI
Special Missions
2423sv602 6-1
Change 1
SPECIAL MISSIONS
This section of the manual is not applicable to SCN 602.
TEMPORARY CHANGE
Page 1 of 2
28 September, 1998
MANUALS AFFECTED:  Operator’s Manuals, Report
No.’s 2423sv600, 2423sv601, 2423sv602, 2423sv603,
2423sv700, 2423sv701, 2423sv702, and 2423sv703.
FILING INSTRUCTIONS: Insert this Temporary Change
into the front of the Sensors and Interfaces Section of
each manual.
INSTRUCTIONS: Add the following Video Interface
information;
VIDEO INTERFACE
Support of external video sources is an optional feature of systems utilizing
the  five-inch  color  flat  panel  display.    This  feature  allows interface with
video cameras and cabin display systems.
 
During video mode, the FMS continues to navigate in a normal manner and
no  CDU  messaging  will  occur.    The  remote  message  annunciator  will
operate in a normal manner.  Pressing any CDU key will cause the display
to exit video mode.
 
To Access Video Mode
 
1. Press the ON/OFF Key to access the dimming control window.
 
 
TEMPORARY CHANGE
Page 2 of 2
28 September, 1998
 
2. Press  the  DISPLAY  Line  Select  Key  to  access  the  display  options
window.
 
 
3. Press  the VIDEO Line Select Key to access video mode.  The active
video source will be displayed.
 
To Adjust Video Brightness
 
The two upper right line select keys (1R and 2R) are used to adjust video
brightness while in the video mode.  Press and hold line select key 1R until
display is brightened sufficiently or, press and hold line select key 2R until
display is dimmed sufficiently.
 
To Exit Video Mode
 
Press any key to exit video mode (with the exception of line select keys 1R
and 2R).  Pressing a function key will cause that particular function screen
to be displayed.  Pressing any other key will return the display to that which
was being viewed prior to video mode.
Section VII
Sensors & Interfaces
2423sv602 TOC-i
Change 1
TABLE OF CONTENTS
INTRODUCTION ...................................................................... 7-1
AIR DATA................................................................................. 7-2
ADC Status............................................................................ 7-2
SHORT RANGE SENSORS .................................................... 7-4
Distance Measuring Equipment (DME)................................. 7-4
　
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