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|  MIL-N-81604C(AS)
Para 3.4.4.3.2b
(cont)
slave and free backup modes are a specific air-
craft requirement. The signal shall go to a
true state in the event that the computer deter-
mines that it is incapable of navigation and mode
determination.
The ANCU line driver shall be a
Type B circuit.
INS No-Go - This output from the ANCU to the CAU
c.
goes to a true (high, open, or ANCU power off)
state to indicate that CAINS navigation informa-
tion is not valid. The signal will go to a true
state if the computer self-test detects that navi-
gation information is not valid. The ANCU
driver shall be a Type B circuit.
d.
CAU Flag Reset - The true (low, open, or ANCU
power off) state of this discrete shall be supplied
from the ANCU to the CAU at any time that the ANCU
self-test determines that the ANCU can no longer
supply a trustworthy CAU flag set signal. This
discrete, when in the true state for a minimum of
20 milliseconds, shall cause the CAU flag to go to
the reset (go) state if the flag had been set by
*
the CAU flag set signal. In addition, this dis-
crete shall continue to prevent the CAU flag set
signal from setting the CAU flag as long as reset
*
is present. The false (high) state shall enable
control of the flag from CAU flag set, but shall
cause no change in state of the flag directly.
The line driver in the ANCU and the line receiver
in the CAU shall be Type C circuits.
e.
ANCU No-Go - This output from the ANCU shall be
supplied to indicate that the ANCU malfunction
flag has been set. When the flag is in a set
(no-go) state, a ground shall be supplied. When
*
the flag is in a reset (go) state, an open cir-
*
cuit shall be supplied. The contact rating of
this switch shall be 250 ma resistive or 100 ma
*
inductive at 28 volts d-c.
64
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