Beechcraft C-12C Operator And Technical Reference Manual page 223

FP 7
ESA 13800FT
LUBBOCK
CL C
A-637
ALRT
TRI+6
Figure 3-95. TRI 6 Page
be. The Calculator Pages.
calculator pages that may be used to calculate a
variety of information such as pressure altitude and
density altitude, true airspeed, winds aloft, VNAV
angle, and time zone conversions.
pages rely on manual inputs of air data parameters
even if the KLN 90B is interfaced with air data sensors.
(1) The Calculator 1 Page. The CAL 1 page
is used to determine pressure altitude and density
altitude.
If the AETMS is installed and interfaced to
the KLN 90B, the OTH 10 page displays
pressure altitude and density altitude for
the present conditions.
1. Display the CAL 1 page on the left
side.
2. Press the left CRSR button to turn on
the left cursor function.
3. Enter the altitude indicated on the
aircraft altimeter (IND) to the nearest
hundred feet by using the left outer
knob to move the cursor to the desired
position and the left inner knob to
select each digit.
4. Use the left outer knob to move the
cursor to the first BARO position, and
then enter the current altimeter setting
by using the left inner and outer
knobs. The pressure altitude (PRS) is
now displayed.
5. Use the left outer knob to move the
cursor to the first TEMP position, and
then enter the outside air temperature
(in °C) by using the left inner and
There are seven
The calculator
NOTE
outer knobs.
temperature is either zero if the
temperature is above zero or a minus
(–) if the temperature is below zero.
For maximum accuracy, the static air
temperature should be entered. Static
air temperature is the temperature
without the effect of heating due to
movement through the air.
density
displayed as illustrated in Figure 3-96.
6. Press the left CRSR button to turn off
the left cursor function.
ALTITUDE
IND:04000FT
BARO:29.84"
PRS 4100FT
TEMP: 034
DEN 7100FT
CAL 1
Figure 3-96. CAL 1 Page
(2) The Calculator 2 Page. The CAL 2 page
is used to determine TAS.
If the AETMS is installed and interfaced to
the KLN 90B, the OTH 9 page displays the
TAS for the present conditions.
1. Select the CAL 2 page on the left side.
2. Press the left CRSR button to turn on
the cursor function.
3. Enter the aircraft's calibrated airspeed
by using the left inner and outer
knobs.
known, use the indicated airspeed.
4. Use the left outer knob to move the
cursor to the first ALT position, and
then enter the indicated altitude using
the left inner and outer knobs. If the
indicated
entered on the CAL 1 page, it will
already be displayed.
TM 1-1510-218-10
The first digit of the
altitude (DEN) is
o C
NOTE
If calibrated airspeed isn't
altitude was previously
The
now
3-69