MIL-DTL-62483A(AT)
4.2 Verification methods. The types of verification methods included in this section are
visual inspection, measurement, sample tests, full-scale demonstration tests, simulation, modeling,
engineering evaluation, component properties analysis, and similarity to previously-approved or
previously-qualified designs.
4.2.1 Verification alternatives. The manufacturer may propose alternative test methods,
techniques, or equipment, including the application of statistical process control, tool control, or
cost-effective sampling procedures, to verify performance. See the contract for alternatives that
replace verifications required by this inspection.
4.2.2 Inspection conditions. Unless otherwise specified, (see 6.2) all inspections shall be
conducted under the following conditions:
a. Air temperature: 73 +18°F (23 +10°C).
b. Barometric pressure: 21.4 (+6.8, -22.25) inches (in.) Hg of mercury
[725 (+50, -75) kilopascals (kPa)].
c. Relative humidity: 50 +30 percent.
4.2.2.1 Materials, design and construction. Conformance to 3.2 through 3.2.1 shall be
determined by inspection of contractor records providing proof or certification that design,
construction, processing, and materials conform to requirements. Applicable records shall include
drawing, specification, design data, receiving inspection records, processing and quality control
standards, vendor catalogs and certifications, industry standards, test reports, and data rating.
4.2.3 Operating requirements verification.
4.2.3.1 Production engine break-in run. Each engine shall be hooked to an engine
dynamometer and operated through the break-in run schedule developed by the manufacturer.
During the break-in run, the engine shall be observed for oil pressure, overheating, oil or coolant
leaks, and unusual noises (see 3.3.1). During the break-in run, the governor shall be adjusted and
set to limit the engine speed to 2100 rpm full load and 2450 rpm no load. When the governor is
set to the engine speed specified, it shall be sealed in such a manner that if tampered with, it will
be readily apparent (see 3.3.10.4). The break-in run shall be conducted on all engines prior to
further testing.
4.2.3.2 NATO performance test. With the engine mounted on an engine dynamometer,
and under the environmental conditions specified herein, the tests specified herein, shall be
performed in accordance with NATO standard AC/225 (Panel II), D/131 (part II), section 2-3
(see 3.3.2). The performance test is to include curves of power, torque, and specific fuel
consumption versus rpm at 100%, 85%, 70%, 50%, and 25% load, which will be measured and
calculated at a minimum of five speed settings in both ascending and descending order. The
highest speed setting is to be the rated speed. For each setting, the engine should run for
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