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|  MIL-N-81604C(AS)
Appendix I
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30.5 Detail Requirements
*
30.5.1 Function - Refer to 30.4.1. Figure 36 presents the
functional block diagram of the CAU.
30.5.2 Form Factor - The CAU shall conform to the outline and
mounting drawing presented in figure 37.
Weight - Refer to 30.3.1.
30.5.3
30.5.4 Installation - A shock mount conforming to MIL-c-172
will be required for mounting the CAU. Refer to 30.6.
Electrical Connections - See figure 33.
30.5.5
30.5.6 Contents - The CAU shall consist of a power supply
module, an analog instrumentation servo system, analog digital
--
and digital/analog converters, and digital logic for the serial
interfaces and mode control.
30.5.6.1 Power Supply Module - This module shall contain the
filtered and regulated supplies (+5 and 15 volts d-c) necessary
for CAU operation, along with voltage monitoring circuits.
30.5.6.2 Pitch/Roll Servo Module - This module (two per unit)
shall contain the capability to receive attitude signals from
the IMU and transmit them to the aircraft avionics.
30.5.6.3 True Heading Servo Module - This module shall combine
platform heading with the true heading correction stored in the
ANCU
The resultant true heading shall be transmitted to air-
craft avionics.
30.5.6.4 Magnetic Heading Sevo Module - This servo module
In the normal mode, it shall
shall have two modes of operation.
In the
repeat magnetic heading from HARS to other avionics.
second mode (HARS failure) , handset magnetic variation and true
heading shall be combined to drive the magnetic heading servo.
30.5.6.5 Electronics Module - This module shall contain the
BIT circuitry and the vertical reliability circuitry interface.
It shall also supply servo motor excitation voltages.
30.5.6.6 Tray Assembly - The CAU shall contain four electronic
trays, (A1, A2, A3, and A4) with two laminates per tray.
a.
1A1 Laminate - This laminate shall contain the
A/D converter electronics.
155/156
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