MIL-PRF-24755B(SH)
APPENDIX B
TECHNICAL CONTENT FOR TEST REPORTS
B.1 SCOPE
B.1.1 Scope. This appendix covers the technical requirements that should be included in test reports when
required by the contract or order. This appendix is not a mandatory part of the specification. The information
contained herein is intended for guidance only.
B.2 TEST REPORTS
B.2.1 Report of performance, noise, balance, and motor heating. The figure number of ANSI/AMCA 210
should be identified, together with duct or chamber dimensions and the diameter of nozzle if used. The following
values should be reported in tabular form: ambient barometric pressure, dry bulb and wet bulb temperatures, and air
density; voltage and current (in each phase), motor input kilowatts or horsepower; brake horsepower; fan speed; air
velocity; total static and velocity pressure; air quantity (ft3/min); mechanical (total) efficiency; electrical efficiency.
The maximum amplitude of vibration at free delivery and frequency at which it occurs should be reported.
Computations need not be included in the report if made strictly in accordance with ANSI/AMCA 210. A curve
sheet should be included in the report showing motor input, brake horsepower, fan speed, total and static pressures
of standard air at fan discharge, as oriented, and cubic feet of standard air per minute at fan inlet as the abscissa.
Motor heating at design point in each octave band should be included in this report. An additional curve sheet
should also be included in the report showing results of the tabulated data for speed and torque. The data should be
plotted with synchronous speed-percent as the ordinate and the abscissa as torque-percent of full load. The starting,
pullup, breakdown and full load torque should be indicated on the curve.
B.2.2 Report of shock test. The report should be made by the shock test laboratory or the forms specified in
MIL-S-901 and should include drawing number identification of the fan and motor, as well as photographs of the
fan unit in each test mounting.
B.2.3 Calculations. Calculations required by the contract should be recorded.
B.2.4 Dimensional measurements and visual examinations. Records of the visual examinations and
dimensional measurements made as a requirement of the specification should be recorded.
B.2.5 Chemical or mechanical analyses. A record of chemical or mechanical analyses should be maintained for
castings.
B.2.6 Report of airborne noise. The airborne noise report should comply with the data reporting requirements
of ANSI/AMCA 300. Total octave band sound per levels (see 4.7.3.1) for the fan-motor unit when operating at the
design point should be tabulated and compared with the total sound power levels specified in table III.
Measurements of sound pressure levels and computation of (a) sound power levels emitted from the fan inlet, (b)
sound power levels emitted from fan outlet, and (c) sound power levels emitted from the fan casing should be
performed in accordance with procedures stated in 4.7.3.2, 4.7.3.3, and 4.7.3.4, respectively, and reported. Inlet
sound power levels (see 4.7.3.2), outlet sound power levels (see 4.7.3.3), and casing sound power levels (see 4.7.3.4)
for fan-motor unit operation at the design point should be reported in octave band format. Measured sound pressure
levels for fan-motor unit operation at the design point, sound power levels for the reference sound source,
background sound pressure levels, and sound pressure levels measured when the reference sound source is
operational should be tabulated in octave band format. Diagrams of the test configurations employed when
determining total octave band sound power levels (see 4.7.3.1), inlet sound power levels (see 4.7.3.2), outlet sound
power levels (see 4.7.3.3), and casing sound power levels (see 4.7.3.4) for the fan-motor unit, including position of
the reference sound source, fan-motor unit assembly with respect to walls, floor, and ceiling, and distance of the
microphone from the nearest surface of the fan-motor unit, and distance of the microphone from terminations of the
air inlet and air outlet duct sections attached to the fan-motor unit should be included in the test report.
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