Beechcraft C-12C Operator And Technical Reference Manual page 162

TM 1-1510-218-10
(a) 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 (8).
(b) 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.
(c) 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 not
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.
(7) Altimeter Setting.
(a) With
Monitoring (AETM) system installed and interfaced
with the appropriate altimeter, the correct barometric
altimeter setting is input via the pilot's 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
3-8
the Army Engine
after the BARO field, it cannot be accessed by the pilot
with the controls on the KLN 90B.
(b) 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 (d).
(c) 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.
(d) With the correct altimeter setting
entered, the altitude displayed on line 4 should be
correct within 100 feet.
(8) 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, then the OBS
warning page will be displayed and GPS CRS switch
should be pushed so that the LEG mode is selected.
(9) The database page will now be displayed
with the cursor over ACKNOWLEDGE?.
indicates the coverage area. Line 3 will show the date
the database expires. The KLN 90B will still function
with an out of data database.
The accuracy of the database information
is assured only if the database is current.
Press ENT to acknowledge the information on
the database page.
The NAV 2 Present Position page is now
automatically displayed on the left side of the screen
and the Waypoint page which was active when the
KLN 90B was last turned off will be displayed on the
right side. Refer to Figure 3-5.
waypoint was an airport, the APT 4 page (airport
communications) will be displayed.
Trend
When the NAV 2 page first appears, it is possible
that the present position will be dashed. It can take
the KLN 90B several minutes to acquire the GPS
satellites and to make its initial calculation of its
position. When it reaches a NAV ready status and is
able to navigate, the NAV 2 page will display the
CAUTION
If the last active
Line 1