(b) Latitude and Longitude.
(c) Additional data depending on how
user defines waypoint:
surface of longest runway).
3 User NDB (frequency).
Waypoints are stored in the KLN 90B database
almost exclusively by their ICAO identifiers.
There are several exceptions in Alaska. In
many cases, airports with three letter
identifiers receive the prefix "P", but there
are many that don't. The most reliable
method of determining an Alaska airport
identifier is to look it up from the airport
name or city.
Not all airports receive the prefix letter. Airport
identifiers that are combinations of letters and
numbers do not receive the prefix letter.
(8) Database Update. There are two ways to
update the database.
update may be installed any time prior to the effective
date and the KLN 90B will use the previous data up to
the effective date and automatically begin using the
new data on the effective date.
1. Insert the KLN 90B insertion/
removal tool in the small hole
located on the right side of the unit.
A standard 3/32-inch Allen wrench
may also be used.
2. Turn tool counterclockwise until the
locking mechanism becomes loose
and then continue turning counter-
clockwise until it just barely begins
to become snug. Do not turn so
mechanism starts to bind and can
no longer be turned.
3. Pull the unit out of the rack by
pulling on the sides of the panel.
DO NOT PULL ON THE KNOBS.
4. Remove the old cartridge by pulling
it straight out of the back.
5. Insert new cartridge into the back
of the KLN 90B as indicated by the
label on the cartridge. When the
cartridge is properly inserted, the
"Insert To Here" marking on the
label can just be seen protruding
from the rear of the unit.
6. Make sure the front lug of the
locking mechanism is in the UP
position and insert unit into the
rack as far as it can go.
7. Re-insert tool and turn clockwise
until snug. Pull gently on front
panel to verify unit is locked into
1. Plug 9-pin female connector end of
interface cable into a COM serial
port of computer.
2. Plug the other end of the interface
cable into the data loader jack on
the annunciator panel.
3. Turn on computer, insert Disk 1
and the program will automatically
load and the screen will indicate
4. 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
In steps 5, 6, and 7 repeated presses of
CLR terminate the process and bring the
display back to the original SET 0 page.
UPDATE PUBLISHED DB will now