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|  MIL-N-81604C(AS)
Appendix I
30.4.1.1 E-2C Adapter Requirements - The CAU shall incorporate
the following specific E-2C aircraft adapter requirements:
Adapt the ANCU serial input/output data lines
a.
to the E-2C Avionics digital format. Digitally,
the AN/ASN-92 shall communicate with the Air
Data Computer (ADC), the Computer Programmer
(CP), the Control Indicator Group (CIG), and
the Doppler Radar (DOPLR).
b.
Provide platform pitch and roll synchro outputs
and the vertical reliability discrete to the
Automatic Flight Control System (AFCS) and two
Remote Attitude Indicators (RAI 's).
Adapt ANCU serial input/output data to analog
c.
data outputs of true heading, heading error,
magnetic heading, and magnetic variation.
d.
Provide mode and malfunction discretes to the
Signal Command Readout and Alarm Module (SCRAM).
e.
Accept maqnetic heading as a synchro input from
the Heading and Attitude Reference System (HARS)
to allow continuous generation of magnetic
heading/variation.
30.4.1.2 Back Up Mode Requirements - The CAU shall provide
the following capability in order for the system to provide
the magnetic slaved and platform free back-up modes of
operation:
Provide communication with the CIU via the
a.
serial data path in order to enter and display
latitude and magnetic variation when the ANCU
is inoperative.
*
Provide a d-c analog output from the CAU to
b.
the IMU of earthrate times the sine of latitude
or magnetic slave heading error, depending upon
the operating mode.
Provide automatic or manual mode control and
c.
display in the event that the ANCU is
inoperative.
Provide for high speed initialization of the
d.
heading servos in the CAU to account for the
difference between platform heading and the
desired heading.
154
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