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| MIL-D-23222A(AS)
3.7.1.4
MAXIMUM SAFE LIMITS. - In the event that compliance
with any particular test requirments, as initially
specified in this specification or as supplemented by the pertinent
addendum thereto, would result in an unsafe attitude being attained
or an unsafe maneuver being performed, the authority conducting the
demonstration may authorize an appropriate and equitable deviation
from the specified test requirement. For the purpose of these
demonstration tests, unsafe attitudes and maneuvers are those re-
sulting in angles of bank or pitch greater than 60 degrees, or vibration
levels at the pilots seat equal to 0.4G or 4 times the levels existing
in steady unaccelerated flight at VC, whichever is greater.
3.7.2
TAXI, TAKE-OFF, AND LANDING TESTS. - For the
structural tests of this paragraph, the contractor
shall provide and install instrumentation in accordance with 3.1.9
and to the extent necessary to comply with 3.19.2.5(8), including
that necessary to determine the loads and/or accelerations acting on
external store stations, and on power-plant installations. The tests
of this paragraph in combination with the analysis of 3.19.2.5(8)
are required to demonstrate that the helicopter has structural strength
for the specified envelope of conditions for taxiing, take-off, and
landing. The weight distribution, including ballast as may be necessary
to attain the specified weight and loading configurations, shall be
aS approved by NAVAIR.
3.7.2.1
LAND-BASED AND SHIP-BASED HELICOPTERS. -
Field taxi. including turning, braking
and pivoting and field takeoff tests shall be performed at the maxi-
mum design gross weight, critical center of gravity position, and
taxiing speeds up to the maximum safe speed. Each of the landing
tests of Table I shall be performed with increasing severity until
the sinking speed of column 4 is attained once, or alternatively until
at least 80 percent of that sinking speed is attained six times.
The foregoing tests shall be performed on prepared smooth concrete/
macadam runways or taxiways and on unprepared soft-soil terrain
equivalent to that specified for design and defined in an addendum
to this specification. For the landing tests on the unprepared
soft-soil terrain, the helicopter engine shall be shut down and rotor
RPM reduced to zero with and without rotor brake application. After
shut down the helicopter shall be started, taxied to undisturbed
terrain, and a normal takeoff performed.
3.7.2.2
WATER BASED HELICOPTERS. - Taxi, take-off,
and landing tests shall be as specified
in the contract addendum to this specification.
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