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and headphones. Or the KLN 90B may be interfaced with an external
tone generator installed in the aircraft.
In order to use altitude alerting, the KLN 90B must have an altitude input.
If the altitude input is from an altitude encoder or from an air data com-
puter not having a baro altitude output, then it will be necessary for you to
manually input the proper altimeter setting in order to get accurate
alerting. Remember, the altitude coming from an encoder is pressure alti-
tude and must be corrected with the proper altimeter setting to convert to
actual altitude. This altimeter setting is easily accomplished by entering
the altimeter baro setting on the Altitude page. Press A to display the
Altitude page. Use the left knobs to make the altimeter baro setting.
Press A again to return to the pages previously being displayed. It’s so
easy you have no excuses for not keeping the baro setting updated!
CAUTION: The altitude alerting feature will only be accurate if the
altimeter baro correction is kept updated. If altitude alerting is used,
it is a good idea to update the altimeter baro set on the ALT page
each time you make a change to the aircraft’s altimeter setting.
The volume of the aural alarm tone is changeable on the SET 9 page.
Press the left C to activate the left cursor and use the left inner and
outer knobs to select a desired value between 00 and 99. Increasing
numbers increases the volume.
15.0 UPDATING THE DATABASE
The database is housed in a cartridge which plugs directly into the back of
the KLN 90B. It is designed so that there are two ways for the user to
keep the database current. AlliedSignal General Aviation Avionics
(ASGAA) makes these two types of update services available to you in a
choice of several subscription or random update programs. See the
KLN 90B Pilot’s Guide for details on these programs.
The first method of database update is to remove the old cartridge and
insert a current cartridge. This method involves returning the old cartridge
to ASGAA. This method is described in this section of the manual but
more detailed instructions are presented in section 2.4.2 of the KLN 90B
Pilot’s Guide. Because of the wide range of shipping costs and
import/export regulations for different countries, this method is available
for use only in the United States.
The second is to electronically update the database by means of 3.5”
diskettes supplied by ASGAA and a laptop computer. This method does
not involve removing the KLN 90B from the aircraft’s instrument panel. A
data port, usually mounted in the aircraft’s instrument panel, provides a
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