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3-39
Rev 1
3.10 SPECIAL USE AIRSPACE ALERT
The KLN 90B database contains the location of areas of
special use airspace (SUA). The types of SUA areas
stored in the database and the abbreviations used to
denote these areas are the following:
Class B CL B
Class C CL C
Control Area (used outside USA) CTA
Terminal Area (used outside USA) TMA
Alert Area ALRT
Caution Area CAUT
Danger Area DNGR
Military Operations Area MOA
Prohibited Area PROH
Restricted Area REST
Training Area TRNG
Warning Area WARN
The KLN 90B will normally alert you prior to entering one
of these areas with a message prompt. When the
Message page is viewed it will display AIRSPACE
ALERT and will also display the name and type of the
special use airspace (figure 3-125). If the special use air-
space is a Class B, Class C, CTA, or TMA, the message
page will also instruct you to see the Airport 4 page (air-
port communications) for the primary airport so that the
correct communications frequency may be determined
(figure 3-126).
The SUA alert feature is three dimensional. The SUA
areas are stored in the KLN 90B 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 inconvenienced 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 90B as all altitude below the upper limit
of the SUA. If the actual upper limit of an SUA is charted
in terms of AGL, it is stored in the KLN 90B as “unlimited”.
If the altitude input to the KLN 90B is pressure altitude
from an altitude encoder or air data computer, then you
must manually update the KLN 90B with an altimeter set-
ting (baro correction) in order to receive accurate SUA
alerting. You may easily update the altimeter setting by
pressing the A button to display the Altitude page
(figure 3-127). 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 cur-
sor 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 posi-
tion. 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
ALTITUDE |
|
BARO:29.92"|
ALERT: OFF |
|
|
CRSR
Figure 3-127
AIRSPACE ALERT:
COLUMBUS FOUR MOA
MEM CENTER
1000ft t] 18000ft
enr-leg msg
Figure 3-125
AIRSPACE ALERT:
OMAHA CL C
SEE KOMA APT 4 PAGE
BELOW 5000FT
enr-leg msg
Figure 3-126