MIL-DTL-9490E
Φμ ( f )
-
Von Karman gust power spectral density of intensity specified
in 3.1.2.12 and form specified in MIL-F-8785
f
-
Frequency, Hz
-
Truncation frequency (frequency beyond which aeroelastic
ft
responses are no longer significant in turbulence)
Acceleration weighting functions are defined for vertical and lateral acceleration by figure
1. Probability of exceedance versus turbulence intensity is specified in 3.1.3.7.
3.1.2.13 Active flutter suppression. An active flutter suppression control system may be
used where it is advantageous to the weapon system. The flutter suppression control system shall
conform to the applicable requirements of MIL-A-8870 in addition to the requirements of this
specification.
3.1.2.14 Gust and maneuver load alleviation. An active gust and maneuver load alleviation
control system may be used where it is advantageous to the weapon system. The active load
alleviation control system shall conform to the applicable requirements of MIL-A-8861 in addition
to the requirements of this specification.
3.1.2.15 Automatic terrain following. Performance requirements shall be as specified by
the procuring activity.
3.1.2.16 Control stick (or wheel) steering. The pilot shall retain full capability to maneuver
the airplane within the applicable control force and maneuver limits of MIL-F-8785 or
MIL-F-83300. Automatic disengagement of the AFCS with reversion to manual control is
permitted in meeting this requirement.
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