2.
B. ADZ-81O Air Data System
The ADZ-81O Air Data System is comprised of the AZ-81O Digital Air Data
Computers.
The AZ-81O Digital Air Data Computer (DADC) is a microprocessor-based
digital computer which accepts both digital and analog inputs, performs
digital computations, and supplies both digital and analog outputs. It
receives pitot-static pressures and total air temperature inputs for
computing the standard air data functions.
The DADC provides outputs to
the electronic display system, transponder, flight recorder, flight
guidance computer, as well as other elements of the system, such as fault
warning computers and inertial reference system (IRS). Angle of attack
inputs have been incorporated and computed AOA outputs are provided. The
DADC provides alerting functions.
c. AA-300 Radio Altimeter System
The AA-300 Radio Altimeter System is comprised of the following
components:
. RT-300 Radio Altimeter Receiver Transmitter
. AT-222 Antenna
The AA-300 Series Radio Altimeter System is a high resolution, short-
pulse radio altitude system designed for automatic continuous operation
over wide variations of terrain, target reflectivity, weather, and
aircraft altitude. The radio altimeter provides a dc output voltage and
an auxiliary radio altitude output which are proportional to the aircraft
absolute altitude above terrain.
The precision output is used to drive the PFD RAD ALT display and
supplies altitude information to the flight guidance system.
Proper system operation is indicated by the absolute altitude being in
view on the PFD. The RAD ALT display will be blank for absolute
altitudes above 2,500 feet. If a failure occurs, the RAD ALT display on
the PFD will show amber dashes.
Momentary signal loss within the usable
range will cause the RAD ALT display to blank momentarily.
The AA-300 may be used in-flight to monitor absolute altitude at any
altitude up to the maximum range of 2,500 feet, or the pilot may select
an alert altitude with the DH set control and be alerted automatically
whenever the aircraft reaches that altitude.
The AA-300 may also be used
for displaying ground separation and climb conditions during night or
instrument takeoffs, as well as indicating ground clearance during
approaches.
Pressing the RAD ALT line select button on the TEST menu of the display
controller for confidence testing causes the RAD ALT display on the PFD
to read approximately 100 feet altitude.
22-14-00
Page 12
Aug 15/91
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