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|  MIL-N-81604C(AS)
Para 3.5.1.9.2c
(cont)
normal modes as detemined by the computer control.
This slew mode, when true, shall supersede the
normal computer control modes and shall cause the
IMU to accept the IMU slew sense inputs.
IMU Slew Sense Inputs - The IMU shall accept,
d.
when in the slew mode, slew sense inputs for each
axis in the form of a pulse train excited by
+5 volts d-c. This pulse train will have the
characteristics of 150 Hz between levels of
+5 volts. d-c and ground. For zero rate, equal
plus and ground pulses will be applied. For
full rate in the plus direction (decreasing roll,
pitch, or azimuth output), a continuous +5 volt
d-c signal is applied. For full rate in the minus
direction, a continuous ground signal is applied.
The test equipment shall supply rate limiting of
this signal to prevent rates in excess of 1000
degrees per minute. The IMU with full slew applied
shall have a rate of at least 90 degrees per
minute.
IMU Mount
3.5.2
3.5.2.1 Function - When installed in an aircraft, the IMU mount
shall allow for angular adjustment of the CAINS IMU about all
three axes. After initial adjustment, the shall be capable
of being inserted or removed from the mount within 60 seconds
exclusive of disconnecting cooling air supply.
3.5.2.2 Mechanical Design
3.5.2.2.1 Weight - The IMU mount shall weigh no more than 1.7
pounds. It may be constructed with aluminum, but all contact
points shall be corrosion resistant hardened steel (Type 17-4PH
H1050 COND or better).
3.5.2.2.2 Configuration - The IMU mount shall be cast aluminum
*
in accordance with figure 23. A 0.50-inch diameter stud on the
IMU shall mate with a spherical bearing in the mount to facilitate
a blind mating, accurate indexing location. The index pads shall
be positioned by a close tolerance sleeve pressed into and machined
integral to the aluminum frame. The index pad shall be threaded
internally and shall have wrench flats to torque the pad against
the mount sleeve. Guiding surfaces shall be provided to facilitate
indexing when mounting the IMU in a "blind mate application."
101
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