MIL-DTL-13484G
4.5.3.1.1 Sampling plan. Group B inspections shall be completed in accordance with table IV within 36
months after the date of notification of qualification and within each subsequent 36 month period. The
sample units shall be selected either from stock or a current production lot unless the Government
considers it more practical to select a sample from current production. Switches selected from stock shall
have been produced after the date of notification of qualification or subsequent to the date code of the
previous group B inspection sample units. Group B inspection shall be performed on sample units
produced using the same manufacturing facilities and processes as units normally offered for acquisition.
When there has been no production of a particular type of switch for 36 months or more, sample units shall
be selected from the next production lot presented for acceptance and for each subsequent 36 month
period. When the specification sheet covers more than one part number, the part number subjected to
group B inspection shall be the same part number specified for qualification; however, the group B
inspection sample unit(s) need not be submitted to inspections not specified for qualification.
4.5.3.1.2 Failures. If one or more sample units fails to pass group B inspection, the sample shall be
considered to have failed.
4.5.3.1.3 Disposition of sample units. Sample units subjected to group B inspection shall not be
delivered on the contract or order but shall be kept on hand until the next inspection period for submittal to
the qualifying activity if so requested.
4.6 Methods of inspection.
inspection of contractor records providing proof or certification that materials conform to requirements.
Applicable records shall include drawings, specifications, design data, receiving inspection records,
processing and quality control standards, vendor catalogs and certifications, industry standards, test
reports, and rating data.
defects listed in table III. Examination shall be visual, tactile, or by measurement with standard
inspection equipment.
4.6.3 Physical tests.
4.6.3.1 Shock. To determine conformance to 3.4.1, the switch shall be connected to a rated resistive
load current of 15 amperes. An oscilloscope or other suitable device shall be used to detect momentary
circuit closure or opening due to shock. The switch shall be mounted by means of a suitable strap around
the switch body and subjected to the shock test specified in MIL-STD-202, method 213, test condition I.
An acceleration fore, of 100 gravity units shall be applied in the direction of each of the three major axes
of the switch when in closed position, and shall be repeated with the switch in open position.
4.6.3.2 Vibration. To determine conformance to 3.4.2, the switch shall be connected to a rated
resistive load current of 15 amperes. An oscilloscope or other suitable device shall be used to detect
momentary circuit closure or opening due to vibration. The switch shall be mounted by means of a
suitable strap around the switch body and subjected to a simple harmonic motion having an amplitude of
0.76 mm (1.52 mm maximum total excursion), the frequency being varied uniformly between the
approximate limits of 10 and 55 hertz (Hz). The entire frequency range, from 10 to 56 Hz and return to 10
Hz, shall be transverse in approximately 1 minute. This motion shall be applied for not less than 1 hour in
the direction of each of the three major axes of the switch, with the switch in each open and closed
position (a total of 6 hours of vibration).
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