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PILOT'S OPERATING HANDBOOK
CESSNA 800 ALTITUDE
SUPPLEMENT
ENCODING/ ALERTING/PRESELECT
1000 feet above alert range. Just as altitude leaves alert range, the
HI ALERT lamp goes out.
7.
Turn baroset knob to reset altimeter as
required.
8.
Turn off power, power-off warning flag
appears.
ALTITUDE CAPTURE:
Altitude capture operation may be verified on the ground as follows:
1.
Turn on airplane master and avionics power
switches.
Power-off
warning flag on altimeter should disappear.
2.
Turn on Integrated Flight Control System and verify that a vertical
mode is not selected.
3.
Set altitude selector switches to desired altitude; altitude is dis-
played on readout.
4.
Push in ARM pushbutton switch. Amber ARMD lamp lights.
5.
Turn altimeter baroset knob to set altimeter reading to displayed
alerter altitude. When altimeter reaches approximate selected
altitude, ARMD lamp goes out and green CPLD lamp lights. The
altitude hold indicator lamp on the flight director mode selector
will also light.
6.
Turn baroset knob to reset altimeter as required.
7.
Turn off power switches. Power-off warning flag appears and all
indicator lamps go
out.
ALTITUDE CAPTURE OPERATING NOTES:
CAUTION
The altitude alerter used in this system is not designed to
identify the MDA (Minimum Descent Altitude) or DA
(Decision Height) while making an instrument approach.
Therefore, the alerter should never be used during an
instrument approach to identify the MDA or DA.
1.
If
the altitude selector switches are moved to a new position after
the ARM pushbutton has been pushed in but before the altitude is
captured, the alerter logic is reset and the ARM pushbutton must
be ·pushed again to enable the new altitude.
2.
After altitude capture, and altitude hold mode is established; if the
airplane leaves the selected altitude, the green CPLD lamp will
remain lit. The altitude deviation will be indicated by the altitude
ALERT lamps and the discrepancy between the selected altitude
displayed on the alerter and the airplane altitude displayed by the
altimeter.
3.
If
the altitude selector switches are set to a different altitude after
altitude capture, the Integrated Flight Control System will remain
7
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