LX Navigation d.o.o. LX 7007 C May. 30th 2012
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2.5.2
Altimeter
The altimeter of LX 7007 C is temperature compensated from -20ºC up to + 60ºC. The altimeter is calibrated
from 0 to 6000m (20,000ft), but indication goes up to 8000m (26,000ft).
Important!
After correct
field elevation input
the altimeter indication will always be MSL (Mean sea Level).
2.5.2.1
IGC barogram recalibration procedure
LX 7007 C has an
additional pressure sensor
for altitude recording. To comply with IGC procedures, this
sensor has no external pneumatic Connection. To carry out the baro calibration procedure it is necessary to
remove the instrument from the glider and place it in a vacuum chamber. The procedure is as follows:
•
Switch the instrument
ON
, and wait some minutes (straight line on the barogram beginning)
•
Set logtime to 1 second
•
Place it in the chamber and carry out a short climb to about 100m (to start flight recorder)
•
Bring the chamber pressure to exactly 1013.2 hPa
•
Decrease the pressure by 1000m and hold for about 30 seconds
•
Continue the procedure to 6000m
•
Increase the pressure in 1000m steps back to 1013.2 hPa
•
After reaching ground wait about 3 minutes and switch the instrument off
•
Leave the instrument minimum 5 minutes off
•
Download the last flight and print the barogram using the Lxe PC program
•
Restore flight recorder settings
The barogram will be the last flight in the logbook.
2.5.3
Speed command
Speed command flying based on the McReady theory is a very useful tool to optimise cross country speed.
There are many ways of visual indicators. When the instrument changes to speed command mode, the audio
will change and become a director informing the pilot whether he is flying too fast or too slow. In order to reduce
confusion between vario and speed command audio, some special features were developed:
•
Continuous audio signal in + possible (other kinds of signals can be chosen, see setup)
•
No audio at correct speed (dead band).
2.5.4
Final glide calculation
The final glide calculator calculates the
final glide altitude difference
to the selected point (APT, TP). In the
task mode the final glide is always calculated from the current position, round all uncompleted turn points to the
goal. A
+
indication will inform the pilot that the glider is above the final glide slope and vice versa. The final
glide takes into account
Mc setting, wind, bugs and safety altitude.
2.5.4.1
Final glide after using of FAI finish setting
Mentioned setting can be used after a badge flight is intended to be flown. FAI rulers request arrival above zero
if start has been made above 1000m. The setting is valid until power off.