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The KLN 90B stores the correct time, date and last location of the aircraft
in memory. If any of these parameters are not correct then the GPS
receiver in the KLN 90B will automatically enter a mode in which it can
determine this information. This usually will take less than 12 minutes, so
the KLN 90B should be able to determine its position by the time you have
taxied to the runway. However, if quicker time to lock onto satellites is
required it is possible to shorten this time by giving the KLN 90B the cor-
rect date and time. This is explained in the following two steps.
• If the date is incorrect, rotate the right outer knob counterclockwise until
the cursor is over the entire date. 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 (three dashes). Rotate the right inner knob to display the
correct month. Rotate the right outer knob one step clockwise again and
then use the right inner knob to select the first digit of the correct year (a
9 for 1994, for example). 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 E.
• If it is necessary to reset the time, use the right outer knob to position the
cursor over the time zone. Use the right inner knob to select the desired
time zone. UTC (Coordinated Universal Time, which is also called
“Zulu”) is always a good choice. Now, turn the right outer knob one step
counterclockwise to position the cursor over the entire time field. Use
the right inner knob to select the correct hour. Since 24 hour time is
used be sure to add 12 if the time is after 1:00 P.M. (2:30 P.M. becomes
14:30). Next, 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 correct value. Turn the right outer knob one
more step clockwise to position the flashing part of the cursor over the
second minutes position. The right inner knob is now used to finalize the
time selection. When the correct time has been entered, press E to
start the clock running.
• Turn the right outer knob clockwise to position the cursor over the first
two digits of the altimeter baro set field if the cursor is not there already.
The last KLN 90B baro setting entered is displayed.
NOTE: The KLN 90B will use an altitude input from an altitude encoder or
air data computer. Since the altitude from these devices is usually pres-
sure altitude, altimeter baro correction is required to ensure maximum
accuracy. This altitude input is used for altitude related features of the
KLN 90B. Therefore, it is important to keep the altimeter baro setting
4