3rd Ed. Sep 30, 06 3-7
S–TEC
3.1.3 Navigation Global Positioning System Steering (NAV GPSS) Mode
Program a predefined course into the GPS Navigation Receiver, comprised of
course segments connected by waypoints. Press the NAV mode selector switch
twice to engage the navigation global positioning system steering mode,
unless the navigation mode is already engaged. In the latter event, only press
the NAV mode selector switch once. The NAV and GPSS annunciations will
appear as shown in Fig. 3-9, to acknowledge that this mode is engaged. The
autopilot will laterally steer the aircraft along the predefined course, and limit its
turn rate to either 130% of a standard rate turn (Programmer/Computers with
Hardware Mod Code AM and below) or 90% of a standard rate turn (Programmer/
Computers with Hardware Mod Code AN and above). During this mode of
operation, the autopilot will not accept any course error input from the Course
Pointer (HSI) or Heading Bug (DG).
If it should happen that a predefined course has not been programmed into the
GPS Navigation Receiver upon attempted engagement of the navigation global
positioning system steering mode, then the NAV and GPSS annunciations will
flash, and the autopilot will hold the aircraft's wings level.
Fig. 3-9. AP Display, NAV GPSS Mode Engaged
3.1.3.1 Pilot Selectable Intercept Angle
To select an intercept angle, set the Heading Bug to the desired intercept
heading on the compass card, such that the difference between this heading
and the next course segment is the intercept angle. Press and hold the HDG
mode selector switch, and then press the NAV mode selector switch twice to
engage the heading mode and arm the navigation global positioning system
steering mode. The HDG, NAV, and GPSS annunciations will appear as shown
in Fig. 3-10, to acknowledge this.
The autopilot will establish the aircraft on the selected intercept angle
(heading), until it must turn the aircraft onto the next course segment to prevent
overshoot. At that point in the intercept sequence, the HDG annunciation will
extinguish to indicate engagement of the navigation global positioning system
steering mode.
Fig. 3-10. AP Display, HDG Mode Engaged, NAV GPSS Mode Armed
2nd Rev. Apr 15, 07
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