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|  MIL-S-85018A(AS)
Parameter
Mission Condition
o to 200
Aircraft Yaw Angular Tate (degrees/second)
0 to 600
Aircraft Roll Angular Rate (degrees/second)
0 to 100
Aircraft pitch Angular Rate (degrees/second)
0 to 50
Aircraft Pitch Angular Rate through Zenith
(degrees/second)
Aircraft Roll Angular Acceleration
0 to 1500
(degrees/second squared)
0 to 200
Aircraft Pitch and Yaw Angular Acceleration
(degrees/second squared)
0 to 320 (any
Linear Acceleration Range
direction)
(feet/second squared)
Vertical erection shall be provided by the compensated second order
erection mode using internal accelerometers and an external velocity reference.
In the event of loss of all velocity information, the system shall revert to a
compensated first order mode of vertical erection. Heading data shall be avail-
able in all modes. In the DG mode, heading shall be derived from the direc-
tional gyro which shall be compensated for earth's rate and mean drift; in the
SLAVED mode, the directional gyro shall be slaved to the earth's magnetic field
In the EMERGENCY
as sensed by the magnetic azimuth detector or transmitter.
mode the output of the magnetic azimuth detector shall be provided with elec-
--
tronic damping. The SOARS shall provide a turn rate signal for display equip-
ment. The SLAVED mode directional performance shall be improved by providing
adjustable slaving cutoff values for turns and longitudinal accelerations.
Normally, the SOARS shall operate in a velocity damped condition utilizing valid
In the event true airspeed information
true airspeed as the velocity reference.
is determined invalid by either the invalid discrete signal or the data proces-
sor software techniques, the SOARS shall revert to compensated first order mode
within 30 5 seconds. After velocity information has been redetermined valid,
the system shall return to the Second Order velocity damped condition within 2
2 seconds. The backup first order mode shall be configured to include earth's
rate input to the vertical gyro. Cutout shall be mechanized as follows:
Roll Erection Cutout
Turn rate greater than or equal to 8.0 degree/
minute or lateral acceleration greater than .07g
Pitch Erection Cutout
Lateral acceleration greater than .35g or longi-
tudinal acceleration greater than .07g
Turn rate greater than or equal to 8.0 degree/
Slaving Cutout
minute or lateral acceleration greater than .07g
or longitudinal acceleration greater than .07g
or pitch greater than 25 degrees or roll greater
than 25 degrees
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