MGL Avionics Stratomaster Ultra L - Zero Asi and Vsi; Altimeter Calibration

MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 45
Express difference as a % of TAS.
(2*100)/53 = 3.77 % rounded to 4 %
Enter (100+4) = 104 under airspeed calibration.
Stratomaster Ultra over reading
TAS as indicated by Stratomaster Ultra = 60 mph
Ground speed as indicated by GPS = 55 mph
Difference = 5 mph
Express difference as a % of TAS.
(5*100)/60 = 8.3 % rounded to 8 %
Enter (100-8) = 92 under airspeed calibration.
Stratomaster Ultra reading correct
Enter 100 under airspeed calibration.
To enter airspeed calibration the following steps should be followed:
Step one: Press Next until the required field is highlighted
Step two: Press plus and minus to change
Step three: Press next to move to the next field
Zero ASI and VSI
This function is used to calibrate the zero point readings of airspeed and vertical speed
indicators (ASI and VSI). Use this function from time to time to zero the readings. This way
your instrument will always perform at its best. Perform the zero calibration when your aircraft
is on the ground and not exposed to any airflow (for example when it is parked inside the
hangar). (The engine should not be running).
Do take care to perform the calibration in conditions where no air pressure fluctuations are
present. For example windy conditions can have an effect of air pressure inside your hanger
that may lead to a false setting of the zero point for the VSI.
Use “select” to perform the calibration. The display will not change but may flicker for a
moment. The calibration takes only a few fractions of a second. You may find that it is
perfectly sufficient to perform this calibration once a year.
Altimeter calibration
This calibration is done at the factory using very accurate references. It is not normally
required to change this setting. You may do so if you feel that you would rather use another
reference, like your local airfield’s elevation according to survey maps.
Be aware that generally survey maps and GPS readings may not give you the expected
readings and are subject to small errors. For example, your GPS receiver may be using a
different datum of reference to the survey maps.
The value entered here is a correction factor that is entered during calibration of your
instrument. This factor is shown on your calibration certificate.