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|  MIL-N-81604C(AS)
Appendix I
Para 30.5.10.3
(cent)
Doppler No-Go - This discrete input to the
b.
ANCU goes to a true (high) state to indicate
that the doppler has malfunctioned or is in
the memory mode and, therefore, that the
doppler groundspeed and drift angle informa-
tion is not valid. The electrical interface
*
iS Type B circuitry.
.
ADC No-Go - This discrete input to the ANCU
c.
goes to a true (high) state to indicate that
the air data computer has malfunctioned and,
therefore, that the ADC barometric altitude
and airspeed information is not valid. The
*
electrical interface is Type B circuitry.
*
Flag Reset - Refer to 3.4.4.3.3b. The CAU
d.
line driver shall be a Type C circuit.
*
CAU Fail - Refer to 3.4.4.3.3c. The CAU line
e.
driver shall be a Type C circuit.
30.5.10.4 Converter Reference. The CAU shall provide an output
*
of 26 volts rms, 400 Hz, phase C to the ANCU for use as a refer
ence to the ANCU A/D converters.
30.5.11 CAU/IMU
Interface
CAU/IMU Discrete Interface
30.5.11.1
IMU Ready - Refer to 3.4.4.2a(1). The CAU
a.
line receiver shall be a Type B circuit.
*
The CAU
IMU No-Go - Refer to 3.4.4.2a(2).
b.
load shall be a 40-ma relay coil with +28
volts d-c connected to the other end.
Flag Reset - Refer to 3.4.4.2a(3). The reset
c.
pulse width shall be 250 25 msec. The CAU
line driver shall be a Type C circuit.
CAU/IMU Analog Interface
30.5.11.2
*
Pitch Angle - Refer to 3.4.4.2b(1). The CAU
a.
shall load the pitch synchro from the IMU with
a CT conforming to 26V-08CT4c. The impedance
to ground shall be greater than 2 megohms.
185
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