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MIL-N-81604C(AS)
3.4.1 Operation - The equipment shall continuously provide the
required functions, at all latitudes, rwith the required accura-
cies specified herein under any natural combinations of mission
conditions listed in table IV and environmental conditions listed
in 3.3.10. To provide the modes of operation described in
3.4.1.1, the following externally supplied inputs are required:
Magnetic Heading - The characteristics of the required
a.
magnetic input will be a function of the particular
CAU being used and will be provided via the ANCU/CAU
serial interface channel. This input is required for
all navigation modes except Free.
-
True Airspeed and Barometric Altitude .- The character
b.
istics of these inputs will be a function of the
particular CAU being used and will be provided via
the ANCU/CAU serial interface channel. These inputs
are required for air data navigation and wind compu-
tation only.
Droppler Radar Required to Derive Ground Speed and
c.
Drift Angle - The characteristics of these inputs will
be a function of the particular CAU beinq used and
will be provided via the ANCU/CAU serial interface
channel. These inputs are required for doppler iner-
tial or doppler navigation and in-air alignment only.
Data link information (for carrier alignment only)
d.
Taxi discrete
e.
Weight-on-wheels discrete
f.
The equipment shall conduct self-test which provides a 90 percent
probability of detecting a failure and a 90 percent probability
of isolating a failure to the WRA level. In-Flight Performance
Monitoring (IFPM) self tests shall be in continuous operation
*
in all modes except Off unless inhibited by a malfunction.
3.4.1.1 Modes of Operation - The CIU MODE switch shall have the
following positions:
a.
BIT (Built In Test)
OFF
b.
NORM (normal)
c.
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