S-TEC ST360, Pilot Operating Handbook

17

Preflight

The following preflight procedure provides an operational test of the

entire system, including the encoder, the Altitude Selector/Alerter and
the autopilot.  A successful test is indicated by the autopilot switching
from VS Mode to ALT Hold Mode as the selected altitude is matched to
field elevation.

1. Autopilot Circuit Breaker - IN, ALT Select Power - ON.

2. Transponder with Altitude Encoder  - ON.

NOTE: If the Altitude Selector/Alerter is not receiving a valid
encoder signal, the altitude (ALT) display will read three dashes
(--.-) followed by three "ding dong" chimes.  A period of time
(sometimes several minutes) should be allowed for the encoder to
come on-line which will be indicated by encoded altitude being
displayed on the Altitude Selector/Alerter.  At this time, recycle
power to the Altitude Selector/Alerter and continue with the pre-
flight test.

3. Altimeter -Set to local altimeter setting or field elevation, as appro-
priate.

4. Altitude Selector/Alerter -

A. Observe self test cycle complete - when first powered, the sys-
tem will display all annunciations for approximately 5 seconds
ending with the audio tone.  Thereafter, it will display a baro set-
ting of 29.9 with the baro annunciator flashing.

B. Rotate selector input knob to set baro setting to the nearest .1
in. Hg. (for millibars push baro switch).

C. Push ALT Switch to display ALT SEL with flashing “SEL”
annunciator.  Rotate selector knob to input an altitude 300-400 ft.
higher than the indicated altitude on the Altimeter.