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| MIL-D-23222A(AS)
3.1.9.2
(Cont)
same signal conditioning equipment that will be installed on the
demonstration aircraft, and shall be made to at least the maximum
range of' excitation expected during the course of the demonstration.
Calibration test data shall be obtained and recorded during both
increasing and decreasing values of the pertinent parameter
which
the instrument is intended to measure, to assure repeatability and
freedom from hysteresis. All strain gage installations on simple
and complex structures shall be installed to minimize interactions
or "cross-talk" during combined loadings; such interactions as do
exist shall be properly accounted for during the calibration. In-
stallation of strain gages which are impractical to calibrate shall
be resorted to only if it can be shown, prior to such installation,
that the computed loads from such installations are meaningful and
useful, and provided further, that the methods of gage applications
and load calculations from strain gage output, gage factor, and
physical constants or the member are acceptable to the Test Authority.
The instrumentation shall be operated and maintained by the contractor
during the demonstration. If, during the course of the demonstration,
it becomes apparent to the Test Authority that there is a change in
the calibration of certain instruments, such instruments shall be
recalibrated their recalibrations shall be witnessed and accepted
in accordance with 3.1.9.4 and 3.1.9.5. A detailed description
of all instruments and recording devices, methods Of calibration~
locations or instruments, and calibration data for each demonstration
aircraft shall be submitted as separate appendices to the report
required by 3.19.2.3. Such appendices shall be submitted at least
two months prior to the time the aircraft is scheduled to arrive at
the test site.
3.1.9.3
CHECK-CALIBRATIONS. - The contractor shall
make previsions in the design of the recording
system so that, where practicable and feasible, all contractor-installed
demonstration instrumentation shall be check-calibrated by NAVAIRTESTCEN
before commencing a demonstration at NAVAIRTESTCEN. Such cheek cali-
brations will be made through the helicopter recording system and
ground station equipment, while vibrating and/or shock loading the
recorder thru its mounts, by removing the recorder from the helicopter
and suitably mounting the recorder on a test fixture. In lieu of vibra-
ting the recorder during such check-calibrations and subject to con-
currence by NAVAIRTESTCEN, the contractor may perform laboratory tests,
witnessed by NAVAIRTESTCEN, to assure that the application of vibration
and/or shock loading through the helicopter recorder mounts, will not
degrade the demonstration data. The frequency and amplitude of vibra-
tion and/or shock loading of the mounts shall be that which simulates
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