MIL-DTL-81963C
4.10.8 Explosion resistance. For certain specialized requirements, servocomponents may be called
upon to operate in flammable atmospheres. In view of their light form of construction, the
servocomponents cannot be made intrinsically explosion-proof, nor can it be ensured, unless size and
weight penalties be accepted, that even a servocomponent devoid of moving electrical contacts will be
intrinsically safe since its operating surface temperature may well exceed the ignition temperature of the
flammable atmosphere. Testing for either 200 or 2,000 hours, dependent upon the degree of acceptable
risk and on the nature of the atmosphere, is needed to ascertain the explosion characteristics of a
servocomponent. Accordingly, and in view of the probable low incidence of requirements for explosion-
proof servocomponents, no test for such characteristics is specified in this document. Should a
requirement arise, it will be the responsibility of the qualifying activity concerned to specify the explosion
tests to be performed on a servocomponent to satisfy its requirements. It is recommended, however, that
if such a test is invoked, it should be applied to servocomponents which have completed all qualification
approval tests other than salt atmosphere, if appropriate, so that the condition of the test
servocomponents will approximate that which is typical after a considerable period of service. The
servocomponent shall meet the requirements specified in 3.7.8.
4.10.9 Salt atmosphere. Servocomponents shall be tested in accordance with MIL-STD-202, Method
101, Test Condition B, with a 5 percent salt solution. The servocomponent shall be placed in the test
chamber with its shaft horizontal and supported in a manner that provides line contact on material
impervious to the effects of salt moisture and permit maximum circulation of the atmosphere about the
servocomponent. After completion of the test, the servocomponent shall meet the requirements specified
in 3.7.9.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD or in-house
contactor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activities within the Military Service or Defense Agency, or within the military service's system
commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. Servocomponents covered by this specification are intended for use in military
systems for fire control, radar, navigation, guided missiles, and other precision applications.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Title, number, and date of the applicable general specification.
c. Title, number, and date of the applicable documents and the specification sheet that cite MIL-DTL-
81963 as a direct reference, the complete nomenclature, and the Part or Identifying Number (PIN).
d. Whether first article inspection is required (3.3).
e. Packaging (see 5.1).
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