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provides its position solutions based solely on latitude/longitude
calculations.
NAV Page 1 (Normal NAV)
The page is accessed from any mode by pressing the NAV key. The
page provides complete information about the current and next
navigation legs, and allows the pilot to alter the current navigation
leg or select another lateral guidance mode.
FR - The waypoint identifier and time overhead the FROM (FR)
waypoint, or the takeoff time for the first leg. Time overhead is
defined by automatic leg change. Additional navigational data
concerning the leg between the FR and the TO waypoints is
displayed on the line below the FR waypoint.
Section V
Operations
5-36 2423sv602
Change 1
• The Great Circle Distance, expressed in nautical miles,
between the aircraft's present position and the TO waypoint.
• The desired track (course) between the FR and the TO
waypoints. A degree sign (°) signifies a magnetic course and a
"T" designates a true course. The selection of True or
Magnetic is made with the panel mounted Mag/True selector
switch, so the FMS will reflect what is displayed on the HSI.
• The estimated time enroute, in hours and minutes, between
the aircraft's present position and the TO waypoint. If the time
is greater than 99:59, ++. ++ will be displayed.
TO - The TO waypoint identifier and the ETA for that waypoint. The
Great Circle Distance, course, and ETE between the TO and the NX
waypoints is presented on the line below the TO waypoint.
NX - The next waypoint on the flight plan after the current leg and
the ETA for that waypoint. The ETA field will be dashes if the next
waypoint is a GAP.
XTK - Crosstrack. This is the lateral distance in NM left (L) or right
(R) of the extended course centerline between the FR and TO
waypoints. A maximum of 99.9 NM may be displayed. (E)
represents enroute scaling (5.0 nm); (T) represents terminal scaling
(1.0 nm); and (A) represents approach scaling (2° or 0.3 nm
whichever is greater). Deviations less than 1.0 nm are displayed to
0.01 nm resolution.
Section V
Operations
2423sv602 5-37
Change 1
NAV Page 2 (Normal NAV)
When a normal NAV Leg is current, the following page will appear:
FMS# POS - This field displays the current FMS position. Pressing
either line select key will access the DEFINE POSITION page for
entry of present position coordinates. <POS> will be displayed in
the "WPT" entry field.
HOLD POS - Pressing this line select key will access the HOLD
POSITION page.
UPDATE SENS - Pressing this line select key will send current FMS
BCP latitude/longitude to all sensors. Pressing this key is equivalent
to pressing HOLD POS, and ACCEPTing the current lat/long.
SENSORS - Pressing this line select key will access DATA page 3
(FMS POSITION page).
Section V
Operations
5-38 2423sv602
Change 1
Automatic Leg Changes
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 discontinuity (*GAP* or *NO LINK*) or the
TO waypoint is the last waypoint on the flight plan. 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 still occur at
a distance before the waypoint to smoothly intercept next leg. If the
TO waypoint is designated as a overfly waypoint (i.e., delayed
automatic leg change), the leg change will begin over or abeam 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 selected 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),
　
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