MIL-DTL-9320E
3.4.7 Hermetic seal. When tested as specified in 4.5.12, the warning signal shall be
hermetically sealed to withstand a pressure of 20 millimeters of mercury (mmHg) while
submerged in water or ethylene glycol.
3.4.8 Short circuit. When tested as specified in 4.5.15, the warning signal and audio
transformer shall withstand a short circuit for a minimum of 30 seconds from any output pin to
ground.
3.4.9 Pressurization. When tested as specified in 4.5.17, the warning signal shall
withstand pressure of 28 pounds per square inch (psi).
3.4.10 Reliability. When tested as specified in 4.5.8, the warning signal shall exhibit a
minimum acceptable mean time between failure (MTBF) of 500 hours at 90 percent confidence
level.
3.5 Part numbering of interchangeable parts. All parts having the same manufacturer's
part number shall be functionally and dimensionally interchangeable. The item identification
and part number requirements of MIL-STD-31000 shall govern the manufacturer's part numbers
and changes thereto.
3.6 Dimensions. The warning signal shall conform to the dimensions shown on figure 1.
3.7 Weight. The weight of the warning signal shall be not more than 6 ounces.
3.8 Screw threads. Machine screw threads shall conform to MIL-S-7742.
3.9 Identification of product. Equipment, assemblies, and parts shall be marked for
identification in accordance with MIL-STD-130.
3.10 Workmanship. The warning signal, including all parts and accessories, shall be
fabricated and finished in a workmanlike manner. Particular attention shall be given to freedom
from blemishes, defects, accuracy of dimensions, and marking of parts and assemblies.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Test conditions. Unless otherwise specified, all tests shall be made at an atmospheric
pressure of approximately 29.92 inches Hg and a temperature of 25 °C ±5 °C.
4.3 Qualification inspection.
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