LXI LX7007 User Manual
Page 69
LX7007 pro IGC V1.0
Apr. 2005
Page 69
Switch the LX 7007 PRO IGC back to Nav.-Page 3 and check again all 8 directions. The error should now be less
than 1
0
– 2
0
(better to have 1
0
!). If the errors are larger, then one should search for faults in installation or in the
adjustment procedure. When the final test is satisfactory, your LX 7007 PRO IGC is ready to calculate the wind
with the compass method.
Please Note!:
The calibration is specific for your combination of aircraft and compass, which means you cannot transfer the
compass to another aircraft while using the same calibration values.
The parameters are stored in an EEPROM, so they will not get deleted when a memory initialization is performed
or the internal Li-battery is exchanged.
It is recommended to repeat the calibration procedure every year.
6.1.5 Wind calculation during flight
For the wind calculation a finite time is needed to make the calculation. This time (in seconds) is entered in the
INIT menu under WIND/COMPASS. The longer the time the more accurate is the computed wind, and vice
versa.
If the pilot intends to use the wind calculation with the compass module, he has to select in one of the three Nav
Pages the wind menu (just press ENTER when you are on one of the Nav Pages, move the cursor onto WIND and
press ENTER again). Then choose the item COMPASS.
Please Note!:
- The wind calculation with the compass works exclusively in straight flight.
- The calculation is started when the following conditions are fulfilled for at least 5 sec.:
Speed should be constant – It should vary not more than
± 10km/h (6kts)
Flight direction should be constant, variation should be less than
± 5°
The measurement takes that amount of time (in sec.), that was defined in the INIT menu
The result is a new vector wind
If the limits given above are exceeded during the measurement, the procedure will be stopped and restarted as
soon as the conditions are fulfilled again.
The higher the speed, the greater the potential error in the calculated wind.
What the pilot should do during wind calculation:
• Keep the speed and flight direction as constant as possible
• Watch the wind display on one of main Nav pages (lower left corner)
• If WAIT is displayed, it means that the conditions for the measurement are waiting to be stabilized
• When the measurement is started, a time counter will start counting down (like 15, 14, 13, ...). This is
the time in seconds until the calculation is finished
• When the procedure is completed without problems, a new wind vector will be displayed.