The Obs Mode - Honeywell BENDIX/KING KLN 94 Pilot's Manual

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KLN 94 Pilot's Guide
distance between two points located on the earth's surface. In the
case of Direct To operation, the "from" waypoint is not displayed but it
is the point where Direct To operation was initiated. The course to fly
while in this mode is referred to as the desired track (DTK). Knowing
the proper course to be flown is so important that the desired track is
displayed on the left side of the screen (third line) on every page
except the message page. To fly a great circle course between two
points, the desired track may be constantly changing. A good way to
illustrate this concept is with a world globe and a piece of string. You
can determine the great circle path between Denver, Colorado and
Manila, Philippines by stretching the string over the globe between
these two points. Notice that you would start the flight with a north-
westerly desired track, which gradually becomes due westerly, and
finally southwesterly by the time you reach Manila. Of course, your
trips with the KLN 94 will be substantially shorter and the desired track
will probably change only a few degrees.
3. Automatic waypoint sequencing is provided during flight plan opera-
tion. As you reach a waypoint in your flight plan, the next leg of the
flight plan automatically becomes active. There are some situations
during approach operations in which automatic leg sequencing is
automatically disabled. See Chapter 6.
4. Turn anticipation may be utilized in flight plan operation as described
in section 4.2.2.
5. The Minimum En route Safe Altitude (ESA) displayed on the ALT 1
page is the highest MSA sector altitude from the present position to
the destination waypoint along the active flight plan or Direct To route
(whichever is in use). See section 5.1. "Altitude Pages" for a descrip-
tion of ESA and MSA.
5.5.3.

THE OBS MODE

The following are characteristics of the OBS mode.
1. The course deviation indicator (CDI) sensitivity for en route mode is
plus and minus five nautical miles, full scale. This applies to the CDI
on the NAV 1 page as well as any external CDIs or HSIs interfaced to
the KLN 94. If the CDI or HSI has five dots left and right of the center
position, then each dot represents one nautical mile of deviation.
2. The course is defined by the active waypoint and the selected mag-
netic course. A course "to" or "from" the active waypoint may be
selected.
3. The course selection is normally made by changing the selected
course displayed on an external indicator such as an HSI or CDI.
Chapter 5 Intermediate Operation
5-15

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