pointer on the EHSI should be driven to 315° and both
the OBS IN and OBS OUT fields should be displaying
315°. The RMI field always displays 130°. The
copilots RMI should indicate a bearing to the station of
(3) If the KLN 90B has passed the internal
self-test, the bottom left side of the Self-Test page will
display ANNUN ON to indicate that the external
annunciators should all be illuminated. If a flashing
TEST FAIL is displayed, recycle power to the KLN
90B. If the Self-Test page still displays TEST FAIL,
the KLN 90B requires repair and should not be used
c. Correct Time, Date, and Position.
(1) The KLN 90B needs to have the correct
time, date, and position to be able to determine which
satellites should be in view. This information is stored
in the battery-backed memory of the KLN 90B so it is
not normally necessary to update it. If the KLN 90B
has the correct date, time, and position, the time to
NAV ready will usually be 2 minutes or less. If this
information is not correct, the KLN 90B will start to look
for satellites to determine the position of the aircraft.
This process can take as long as 12 minutes but will
normally be around 6 minutes. It is possible to update
this information manually, which will allow the KLN
90B to reach a NAV ready status much faster. If the
date and time are correct, or acquisition time is not
important, proceed to step d.
(2) If the date is incorrect, rotate the right
outer knob counterclockwise until the cursor is over
the date field. Rotate the right inner knob until the
correct day of the month is displayed. Then, rotate the
right outer knob one step clockwise to place the
flashing part of the cursor over the month field. Rotate
the right inner knob to display the correct month.
Rotate the right outer knob one step clockwise again
and use the right inner knob to select the first digit of
the correct year. Next, rotate the right outer knob one
more step clockwise and then use the right inner knob
to select the second digit of the year. When the date
is correct, press ENT.
(3) If it is necessary to reset the time, use the
right outer knob to position the cursor over the time
zone field. Use the right inner knob to select one of 19
time zones. UTC Coordinated Universal Time (Zulu)
is always a safe choice. Then turn the right outer knob
one step counterclockwise to position the cursor over
the time field. Use the right inner knob to select the
correct hour. Twenty-four hour time is used. Now turn
the right outer knob one step clockwise to position the
flashing part of the cursor over the first minutes
position. Turn the right inner knob to select the
desired value. Turning the right outer knob one more
step clockwise positions the flashing cursor over the
second minutes position, and the right inner knob is
now used to finalize the time selection. When the
correct time has been entered, press ENT to start the
clock running. The KLN 90B system time will
automatically be corrected very precisely once a
satellite is received.
d. Altimeter Setting.
(1) With the Army Engine Trend Monitoring
(AETM) system installed and interfaced with the
appropriate altimeter, the correct barometric altimeter
setting is input via the pilots altimeter. It will not be
possible to access the BARO field on the Self-Test
page or the Altitude page. If there is no colon after the
BARO field, it cannot be accessed by the pilot with the
controls on the KLN 90B.
(2) Turn the right outer knob clockwise to
position the cursor over the first two digits of the
barometric altimeter setting if the cursor is not already
there. If the correct altimeter setting is displayed, skip
to step (4).
(3) To enter the correct altimeter setting,
rotate the right inner knob to select the first two digits.
Rotate the right outer knob one step clockwise to
move the flashing cursor over the third position. Use
the right inner knob to select the correct number. Use
the right outer knob and inner knobs to complete the
altimeter setting and press ENT.
(4) With the correct altimeter setting entered,
the altitude displayed on line 4 should be correct within
e. Approve Self-Test Page. Turn the right
outer knob clockwise to position the cursor over
APPROVE? if it is not there already. Press ENT to
approve the Self-Test page. Five beeps should be
heard when the Self-Test page is approved to confirm
altitude alert audio. If the GPS CRS switch is in the
OBS position, the OBS warning page will be displayed
and GPS CRS switch should be pushed so that the
LEG mode is selected.
database page will now be displayed with the cursor
over ACKNOWLEDGE?. Line 1 indicates the
coverage area. Line 3 will show the date the database
expires. The KLN 90B will still function with an out of