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5-11
Rev 1
The density altitude (DEN) is now displayed.
6. Press the left C to turn off the left cursor function.
NOTE: If a compatible air data system is interfaced to the
KLN 90B the Other 10 (OTH 10) page displays pressure
and density altitude directly for the present conditions.
5.3.2 The Calculator 2 Page (CAL 2)
The CAL 2 page is used to determine the true airspeed
(TAS) of the aircraft. To calculate the true airspeed:
1. Select the CAL 2 page on the left side (figure 5-34).
2. Press the left C to turn on the left cursor function.
3. Enter the aircraft’s calibrated airspeed by using the
left inner and outer knobs (figure 5-35). If the cali-
brated airspeed isn’t known, use the indicated air-
speed. For most aircraft the difference between the
calibrated airspeed and the indicated airspeed is
small at cruise airspeeds.
4. Use the left outer knob to move the cursor to the first
ALT position, and then enter the aircraft’s indicated
altitude using the left inner and outer knobs. If the
indicated altitude was previously entered on the CAL
1 page, it will already be displayed.
5. Turn the left outer knob to move the cursor to the
first BARO position and then enter the current
altimeter setting using the left inner and outer knobs.
If the altimeter setting was made on the CAL 1 page,
it will already be displayed. The SET 7 page is used
to select between making the altimeter setting in
inches of mercury (”) or millibars (MB).
6. Rotate the left outer knob to move the cursor to the
first TEMP position, and then enter the outside air
temperature (degrees C) by using the left outer and
inner knobs (figure 5-36). The first digit of the tem-
perature is either “0” if the temperature is above
zero or “-” if the temperature is below zero. For max-
imum accuracy, the “total air temperature” should be
entered. This is the temperature of air including the
effect of heating due to movement through the air.
The temperature read on a standard outside air tem-
perature gauge found on most piston aircraft is “total
air temperature”. Note that because of the two types
of temperature, a temperature entry made on the
CAL 1 page is not transferred to the CAL 2 page.
The true airspeed (TAS) is now displayed.
7. Press the left C to turn off the left cursor function.
NOTE: If a compatible air data system is interfaced to
the KLN 90B, true airspeed (TAS) is displayed directly
on the Other 9 (OTH 9) page for the present conditions.
Figure 5-34
TAS |
CAS: 139kt|
ALT:08500ft|
BARO:30.04"|
TEMP: 002^C|
TAS 158kt|
CAL 2
Figure 5-35
TAS |
CAS: 144kt|
ALT:08500ft|
BARO:30.04"|
TEMP: 002^C|
TAS 163kt|
CRSR
Figure 5-36
TAS |
CAS: 144kt|
ALT:08500ft|
BARO:30.04 |
TEMP: 006^C|
TAS 164kt|
CRSR