Turn on the KLN 90B. Press ENT as
required to approve the Self Test and
Database pages. Use the left outer
knob to select the Setup (SET) type
pages and the left inner knob to select
the SET 0 page.
In steps 5, 6, and 7, repeated presses of
CLR terminates the process and brings the
display back to the original SET 0 page.
Press the left CRSR. UPDATE
Press ENT. The database region
and expiration date of the database
presently loaded will be displayed. If
the database is out of date, the word
EXPIRES changes to EXPIRED.
continue the update procedure. The
estimated load time in minutes is
estimated load time and begin erasing
the existing database. The unit will
display, ERASING DATABASE. After
loading of the new database will begin
automatically. As the new data is
loaded, the percentage of transfer will
When disk 1 is complete, the screen
will display, "Insert Disk 2." Press any
key to continue. Remove disk 1 and
insert disk 2 and press any key on the
computer. The load operation will
continue. If the database has three
disks, the computer will prompt when
to insert disk 3.
10. The KLN 90B will ndicate when the
database update is complete and
display the expiration date. You may
turn the unit off at this time or press
ENT to restart the KLN 90B.
Update of the database must be conducted
on the ground. The KLN 90B will not
updates. An update of database requires
The accuracy of the database information
is only assured if it is used before the end
of the effective period.
(a) The KLN 90B contains an internal
lithium battery that is used to retain the user-defined
database as well as the flight plans.
(b) The KLN 90B was designed to
provide worldwide navigation coverage from North 74o
latitude to South 60o latitude. Outside this area,
magnetic variation must be manually entered.
3D-3. TURN-ON AND SELF-TEST.
a. Turn On. Turn on the KLN 90B by pressing
the power/brightness knob to the IN position. It takes
a few seconds for the screen to warm up.
b. Self-Test. The turn-on page will be displayed
for a few seconds. During this time, the KLN 90B
performs an extensive internal test. When the internal
test is complete, the Self-Test page will automatically
replace the Turn-On page. Refer to Figure 3D-4.
31 JUL 94
OBS IN 242o
E N R - L E G
+ + + + + + + + + +
Figure 3D-4. Self-Test Page
(1) Adjust the display brightness to the
desired level by rotating the power/brightness knob.
(2) Verify the data displayed on the left side
of the self-test page is the same as is being displayed
on the EHSIs. The distance field always displays
34.5 nautical miles. The deviation bar on the EHSI
should be indicating a half scale right deviation. The
TO / FROM indicator should be showing FROM. The
OBS out field always displays 315°. If the EHSI is
capable of being driven by the KLN 90B, the course