MGL Avionics Stratomaster Ultra Horizon XL Owner’s manual
Page 54
IFR displays using the AHRS components
The Ultra Horizon offers you the following IFR related components:
a) Artificial horizon (attitude indicator) – requires SP-3h or SP-3hc or SP-4
b) Rate of turn indicator – requires SP-3h or SP-3hc or SP-4
c) Slip indicator – requires SP-3h or SP-3hc or SP-4
d) Compass – requires SP-1, SP-2 or SP-3hc
AHRS mode indicator
The first character can be:
1) A – the AHRS is operating in accelerometer mode.
2) G – the AHRS is operating in gyro mode.
The optional second character is a “P”. This is shown if you have pressed the “Prev” button to set
the pitch angle on the display to zero. This is to remind you that you are not seeing the actual
pitch angle as measured by the IMU but have told the instrument to add an additional angle so
the display is shown with zero pitch. Pressing the “Prev” button again will cancel this mode.
Slip indicator
This resembles a traditional slip indicator. It is based on the X axis accelerometer.
Turn indicator
This gives you a marker that shows you a rate one turn (20 degrees). If the marker is aligned with
either of the two outer vertical lines then you are flying a rate one turn.
The horizon display
This shows you a view on the estimated horizon. Take note that the horizon shown is a result of
thousands of calculations per second, measuring your aircrafts movement through the air. The
horizon is called estimated as it is subject to errors that may have been introduced by various
factors. Keep in mind that a IMU cannot know where the earth surface is in relation to your
aircraft, it can only estimate it.
You will find more detail on this and how to install and setup the IMU for best performance in the
manuals for the IMU.
Compass or
Gyro compass
heading
Artificial horizon
(attitude indicator)
AHRS mode
indicator
Slip indicator
Turn indicator
Compass mode
indicator
