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MIL-N-81604C(AS)
Para 3.4.1.1.3c
(cont)
if valid doppler or air data information iS
available. If valid doppler information is
available, the doppler mode of navigation
shall be selected. If no valid doppler infor-
mation is available, air data navigation using
wind computed previously from doppler or Pro
inertial velocities shall be selected.
visions shall be made for manually inserting
wind information at this time from the CIU.
Only attitude and heading information will be
provided by the equipment in the event of a
computer failure which inhibits navigational
computer. This mode is provided only if
mechanization is completed within the aircraft
unique CAU for which this mode is a specific
aircraft requirement. Otherwise, the equip-
ment shall provide an attitude reference only.
Platform Free - In this mode, the IMU shall
operate as a heading and attitude reference
only. The IMU level shall be maintained by
controlling the level gyro axis with the infor-
mation from the level accelerometers. The
equipment shall provide pitch, roll, and grid
heading. No navigation capability is avail-
able. Inertially smoothed grid heading shall
be made available from the CAU. The IMU
azimuth gyro shall be controlled in this mode
by the CAU. A maximum azimuth rate of 100
deg/hr shall be available.  The grid heading
output of the CAU may be slewed to a new
reference by using the HEADING SLEW switch on
the CIU to slew the CAU at a high rate rather
than the IMU. The IMU heading reference shall
be used primarily to provide smoothing This
mode shall be entered automatically if the
computer should lose the capability to provide
inertial navigation at latitude above 70 degree
north  and  70  degrees  south.This  mode
provided only if mechanization is completed
within the aircraft unique CAU for which this
mode is a specified aircraft requirement.
Otherwise, the equipment shall provide an
attitude reference only.
27

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