BendixKing KLN 900 - Abbreviated Guide - Manual (Page 27)

The SUA alert feature is three dimensional. The SUA areas are stored in
the KLN 900 database with regard to altitude when the actual SUA altitude
limitations are charted in terms of mean sea level (MSL). Therefore, if you
are flying either above or below an SUA area you won’t be inconve-
nienced with nuisance alert messages. However, if the actual lower limit
of a SUA is charted in terms of an altitude above ground level (AGL), then
it is stored in the KLN 900 as all altitudes below the upper limit of the SUA.
If the actual upper limit of a SUA is charted in terms of AGL, it is stored in
the KLN 900 as “unlimited”.
If the altitude input to the KLN 900 is pressure altitude from an altitude
encoder or air data computer, then you must manually update the
KLN 900 with an altimeter setting (baro correction) in order to receive
accurate SUA alerting. You may easily update the altimeter setting (baro-
metric pressure) by pressing the
A button to display the Altitude page.
The cursor will be over the inches field if “inches” was previously selected
on the SET 7 page. If “millibars” was selected on the SET 7 page then the
cursor will be over the first two digits of the millibar field. The left inner
knob is used to change the digits and the left outer knob is used to move
the cursor to the desired position. When the altimeter setting is complete,
press
A to return to the pages previously in view.
CAUTION: Failure to keep the altimeter baro setting updated will
result in inaccurate special use airspace alerting. If this feature is
used, it is a good idea to update the altitude baro setting on the ALT
page each time you make a change to a aircraft’s altimeter setting.
NOTE: If there is no altitude input to the KLN 900, all altitudes will be
regarded as being within the boundary of the SUA area.
Only the outer lateral boundaries are stored for Class B, Class C, CTAs,
and TMA airspace. These SUA areas are stored as “cylinders” of air-
space so all altitudes below the upper limit of these areas are considered
to be in the SUA.
The message prompt for a special use airspace alert will occur when the
aircraft’s position is at a point such that a projection of the aircraft’s
existing track over the ground is approximately 10 minutes from pene-
trating the outer boundary of one of these areas. It will also occur if the
aircraft is within approximately two nautical miles of one of these areas
even if the aircraft’s projected track over the ground won’t actually pene-
trate the SUA area. If one of the SUA areas is penetrated, another
message will state: INSIDE SPC USE AIRSPACE.
The SUA alert feature may be disabled (or enabled) on the Setup 8 (SET
8) page. After displaying the SET 8 page on the left side, press the left
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