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MIL-F-8566H(AS)
3.2.1.6.3 Depression. The mechanical depression limit shall be -50 +1
degrees from a plane parallel to the turret mounting surface. The electrical
depression limit shall be -50.25 + 0.25 degrees from a plane parallel to the
turret mounting surface.
3.2.1.7 Turret velocity.
3.2.1.7.1 Angular velocity.  Turret angular velocity (steady-state) shall
not be less than 80 degrees per second in azimuth and not less than 60 degrees
per second in elevation. The turret shall slew from the maximum left azimuth
(-109 degrees) to the maximum right azimuth position (+109 degrees) in not more
than 3.5 seconds and from the maximum right azimuth position (+109 degrees) to
the maximum left azimuth position (-109 degrees) in not more than 3.5 seconds.
The turret shall slew from the maximum elevation position to the depression
angle of 50 degrees in not more than 1.5 seconds and from 50 degrees depression
to the maximum elevation position in not more than 1.5 seconds.
3.2.1.7.2 Elevation velocity error. With the elevation command signal
changing at a constant rate corresponding to a turret movement of five degrees
per second in elevation, the turret shall follow this motion within three mils
as measured by the synchro error signal received by the servo amplifiers.
3.2.1.7.3 Azimuth velocity error. With the azimuth command signal
changing at a constant rate corresponding to a turret movement of five degrees
per second in azimuth, the turret shall follow this motion within two mils as
measured by the synchro error signal received by the servo amplifiers.
3.2.1.8 Turret acceleration. The turret drives shall accelerate the
turret at a minimum rate of 120 degrees per second squared in any axis or
combination of axes. The acceleration shall be measured using a step input from
standstill.
3.2.1.9 Fixed turret positions.
3.2.1.9.1 Fixed forward firing.  The turret shall assume the fixed forward
firing position when a gunner or pilot command signal is received.
3.2.1.9.2  Upper stow. When the aircraft action switch is not depressed,
the turret shall maintain an upper stow position with the gun at 0 1 degree
azimuth and elevated 11 + 1 degrees relative to the helicopter waterline. The
turret shall assume and retain the upper stow position whenever the action
signal is removed and there is no fixed forward firing command.
3.2.1.9.3 Emergency stow. If system electrical power is lost, the emer-
gency power system shall return the turret to 0 + 5 degrees in azimuth and a
minimum of 10 degrees in elevation relative to the aircraft datum line. When in
the emergency stow position, the system shall provide a signal for a panel
indication.
3.2.1.10 Helicopter wing stores safety interlock. The wing stores safety
interlock shall prevent the firing of wing stores except when the turret gun
line is within five degree's of the zero degrees azimuth position.
9

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