(3) The Super NAV 1 Page. When the NAV
1 page is selected on both the left and right sides at
the same time, the Super NAV 1 page is displayed.
The Super NAV 1 page contains exactly the same
information as the standard NAV 1 page but spreads
the data across the entire screen making it easier to
b. NAV 2 Page. The NAV 2 page displays the
aircrafts present position in two formats. The first
format is in terms of the distance and radial from a
nearby VOR. The second format is in latitude and
c. NAV 3 Page. Refer to Figure 3D-11.
(1) Desired Track (DTK). The great circle
course between two waypoints. Any CDI or EHSI
driven by the KLN 90B, including the CDI displayed on
the NAV 1 page is referenced to this desired track.
If the KLN 90B is in the OBS mode, the
selected course (OBS) is displayed instead
of the desired track.
FLY L 2.7NM
Figure 3D-11. NAV 3 Page
(2) Actual Track (TK). The aircrafts present
track over the ground.
(3) Cross Track Error Correction. This is a
text means of indicating how far and which direction to
get back on course. It is consistent with the vertical
deviation bar displayed on the NAV 1 page.
(4) Minimum Safe Altitude (MSA). The MSA
displayed is the altitude defined by Jeppesen as Grid
Minimum Off-Route Altitude (Grid MORA). This
altitude is derived by Jeppesen for sectors that are 1°
of latitude by 1° of longitude in size. One degree of
latitude is 60 nm. One degree of longitude is 60 nm at
the equator and progressively less than 60 nm as one
travels away from the equator. One degree of
longitude is approximately 50 nm at the southern most
parts of the U.S. and is approximately 40 nm at the
northern most parts of the U.S. The MSA altitude
information is contained in the database and is
updated when the database cartridge is updated.
The MSA provides reference point clearance
within these 1° latitude by 1° longitude sectors. A
reference point is defined as a natural (peak, knoll, hill,
etc.) or man-made (tower, stack, tank, building, etc.)
object. Grid MORA values clear all reference points
by 1000 feet in areas where the highest reference
points are 5000 feet MSL or lower. MORA values
clear all reference points by 2000 feet in areas where
the highest reference points are above 5000 feet MSL.
The KLN 90B displays dashes for areas outside the
database coverage area or for areas where the Grid
MORA is not defined.
The MSA and ESA altitudes are advisory in
nature only. They should not be relied
upon as the sole source of obstacle and
minimum clearance altitudes.
(5) Minimum En Route Safe Altitude (ESA).
When the KLN 90B is in the LEG mode, the ESA is the
highest MSA from the present position to the active
waypoint, to the destination waypoint via the active
flight plan. When the KLN 90B is in the OBS mode,
the ESA is the highest MSA from the present position
to the active waypoint. Refer to Figure 3D-12.
Figure 3D-12. Minimum En Route Safe Altitude
d. NAV 4 Page. The NAV 4 page is used for
altitude alerting and for advisory vertical navigation.
Refer to Figure 3D-13.