S-TEC ST-901, Руководство по эксплуатации для пилотов

Страница: 18 / 34

5th Ed. Feb 15, 08 3-3
S–TEC
3.1 Normal Operating Procedures
3.1.1 Heading (HDG) Mode
Set the Heading Bug to the desired heading on the compass card (HSI or DG).
Engage the GPSS Converter's HDG mode.
Engage the autopilot's HDG mode.
The autopilot will turn the aircraft onto the selected heading and hold it. The turn
rate will be limited to 90% of a standard rate turn, although for some higher
performance (turboprop) aircraft this is 75%.
A new heading can be subsequently selected by setting the Heading Bug to it.
3.1.2 Global Positioning System Steering (GPSS) Mode
Set the Heading Bug under the Lubber Line.
Engage the GPSS Converter's HDG mode.
Engage the autopilot's HDG mode.
Program the GPS Navigator with a sequence of waypoints, as a means to define
the desired course.
Engage the GPSS Converter's GPSS mode.
The autopilot will begin to laterally steer the aircraft along the course (i.e., track
the course).
The turn rate will be limited to 90% of a standard rate turn, although for some
higher performance (turboprop) aircraft this is 75%.
If it should happen that the GPS Navigator has not been programmed with a
sequence of waypoints upon attempted engagement of the GPSS mode, then
the autopilot will hold the aircraft at wings level, and the GPSS lamp will flash on
the HDG / GPSS Selector Switch to acknowledge this condition.
Engaging any autopilot roll mode other than HDG (i.e., NAV, APR, REV, STB,
LO TRK, HI TRK) will decouple the autopilot from the GPSS mode.
With the GPSS mode engaged, the autopilot will not respond to the Heading
Bug or Course Pointer.
Note:
It is not possible to simultaneously engage the HDG mode and arm the
GPSS mode. Consequently, there does not exist the capability to execute
a dual mode, pilot selectable intercept angle of the course.