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| MIL-D-23222A(AS)
(Cont)
3.7.3.3
0.3 second to the required displacement, held for the time necessary to
obtain the specified load factor, and returned in not more than 0.3
second to that displacement required for level coordinated flight. If
the specified requirements are not met by use of these control motions,
the sequencing, magnitude, and rates of control displacements shall
be varied to determine the combination which results in fulfilling
the test requirements or maximum attainable, whichever is less.
Selection of specific parameters to be used during the Formal Demo-
stration at NAVAIRTESTCEN will be made during the pre-demonstration
conference of 3,7.1.2.
OPERATION OF PILOT-OVERRIDING FLIGHT CONTROL
3.7.3.3.1
SYSTEMS. - These requirements apply to systems
which can move the control surfaces, including rotors, independently
of the pilot, either by design for intended use or because of mal-
function. The influence of such system on control-surface movements
and helicopter flight characteristics in dives and pullouts shall be
completely determined during tests of 3.7.1.1 or during other applica-
ble tests. Whether the system is engaged or disengaged during each test
of Table 2, shall be determined by the Government during the pre-demon-
stration conference of 3.7.1.2.
3.7.4
FLIGHT VIBRATION TESTS. - These tests are required
to demonstrate compliance with vibration-comfort
requirements and to demonstrate that the helicopter is free from ex-
cessive shake, vibration, or roughness affecting the capability of
the helicopter to perform its missions, or affecting its structural
integrity. Vibration pickups shall be installed at least at the
stations specified below. Measurements shall be made in the indicated
directions during steady Unaccelerated flight at airspeeds from O to
VL in 20-knot increments and 0 to minus 30 knots in 10-knot increments.
The rotor RPM during the tests shall cover the minimum to maximum
permissible rotor RPMs in at least four approximately equal increments.
Methods of data recording and data reduction shall be included or
referenced in the report of vibration data for the following:
(a) Crew seats (lateral, vertical, and longi-
tudinal)
(b) Rudder pedals (longitudinal)
(c) Heel troughs (vertical)
(d) Cyclic-control column (longitudinal and
lateral)
36
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