Trutrak Sorcerer User Manual download pdf (Page 4)

Autopilot Power Up

The autopilot master switch should be in the off position when the

engine is started. Aircraft electrical systems can generate voltage

transients during an engine start and like other avionics systems, the

autopilot should not be subjected unnecessarily to these conditions.

After start up, turn on the autopilot master switch and keep the aircraft

stationary as the internal gyros are initialized. This takes approximately

ten seconds during which time the display will show the words PWR UP

in the lower right. When initializing is complete PWR UP will change

to AP OFF.

Mode and Data Display

The display shows operating modes and associated data. It is also

used to display setup mode screens and their values. When displaying

operating modes, the left side shows lateral data and the right side shows

vertical data. NO GPS will be displayed in the top left of the display

when no GPS signal is detected. A flashing period will appear when a

GPS signal is detected, but no position information is available. The

words NO FIX will be displayed. Once GPS position data becomes valid

a flashing asterisk will appear and the display will show GPS OK. If

GPS flight plan information is being received over the serial channel or if

GPS steering information is being received, a flashing plus sign will be

shown in place of the asterisk.

The upper left display is labeled TRK, showing the electronic DG

slaved to GPS track. When the GPS track is not available, TRK will be

replaced by BANK. This means the autopilot is using its internal gyros

for bank angle control. The lower left display labeled SEL shows the

selected GPS ground track when in the standard track mode. When in

the gyro mode, the lower left shows the current selected bank angle. The

upper right display shows altitude or selected altitude, and the lower right

display shows either selected vertical speed or selected airspeed.

Underlined numbers indicate a value that can be adjusted by rotating

the knob. A sample of the display is shown below.

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Trutrak Sorcerer User Manual Page 4