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on a 24 hour format.
Section II
Control & Display
2423sv602 2-15
Change 1
NAV Key
The NAV key is used to access the navigation function display
pages. There are normally two NAV pages; however, when another
NAV mode such as APPROACH or HEADING is selected there will
be two or more display pages which are cycled through by pressing
the PREV or NEXT function keys.
NAV Function
The NAV function and pages display all the navigation data normally
required by the pilots, as well as provide a means of altering the
current navigation leg. The navigational data displayed includes the
current FR (from), TO (to), and NX (next) waypoints from the flight
plan; the distance, course, and bearing to the TO waypoint; the
parallel crosstrack left or right of the course; the wind direction and
speed, the wind drift angle; and the current groundtrack and
groundspeed. Provisions are included in the NAV mode which allow
the pilot to define and fly a parallel course, to select and fly a
heading, to track a predetermined bearing using a pseudo-VORTAC,
or to fly an approach.
Whenever the current navigation leg is valid (TO waypoint displayed
on the NAV page) and the position is certain, the HSI flag will be out
of view and the desired track and related data will be displayed. Roll
steering outputs for flight guidance will be available if the navigation
leg and velocity are valid. Velocity will be valid if IRS velocities or
heading and TAS are available to the navigation computer.
Normally, leg changes along a flight plan are automatic. Automatic
leg changes will not occur if there is no NX waypoint on the NAV
page. For example, no automatic leg change will occur when the TO
waypoint is followed by a gap (*GAP* or *NO LINK*) or the TO
waypoint is the last waypoint on the flight plan. In this situation, the
message NEXT LEG INVALID will occur. When the aircraft passes
the TO waypoint there will be no leg sequencing, TO/FROM will
change to FROM, distance will begin to increase, and the message
CURRENT LEG EXTENDED will be displayed. This presentation
will alert the pilot that the aircraft is proceeding on an extension of
the last valid desired track from the last waypoint.
Section II
Control & Display
2-16 2423sv602
Change 1
Fifteen seconds prior to an automatic leg change (or arrival at the
TO waypoint) the WPT ALERT message will become active and the
WPT alert annunciator will illuminate steady. Pressing the MSG key
will display the message. Automatic leg changes occur before the
TO waypoint at a distance based upon groundspeed, leg change
magnitude, and roll steering bank limit for the present altitude. The
maximum distance before the waypoint at which the leg change will
occur is 12 NM. If the aircraft passes to the side of a TO waypoint,
the leg change will occur abeam the waypoint. If the TO waypoint is
designated as a fly-over waypoint (i.e. delayed automatic leg
change), the leg change will begin over the waypoint.
When the approach mode is entered, leg changes at the approach
waypoints are automatic. In the approach mode, the WPT ALERT
message becomes active and the WPT alert annunciator illuminates
steady 5 seconds prior to an automatic leg change. When the
approach mode has been activated within 50 NM of the end-ofapproach
point (MAP or runway) and the required navaid is tuned,
the FMS will generate the approach mode outputs. These will
include bearing and distance to waypoint, desired track, crosstrack,
lateral valid, approach annunciator, vertical deviation (glideslope),
and vertical valid.
Section II
Control & Display
2423sv602 2-17
Change 1
NAV Page 1 (Normal NAV)
The information presented on NAV page 1 correlates with the
information displayed on the HSI. The page is accessed from any
other mode by pressing the NAV function key. The page provides
complete information about the current and next navigation legs, and
allows the pilot to alter the current navigation leg or to select another
lateral guidance mode.
The NAV page 1 display is divided by a dark horizontal line.
Information above the line is formatted in the manner of non-radar
position report and includes:
FR - The from field displays the name of the current ‘FROM’
waypoint and the time of waypoint passage. Under the waypoint
name the desired course, distance and ETE to the current ‘TO’
waypoint appears. Desired course is the course (or desired track)
between ‘FROM’ and ‘TO’ waypoints. Distance and ETE are from
present position to the ‘TO’ waypoint. ETE is distinguished from
　
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