MIL-PRF-22710H
TABLE IX. Group B inspection.
Requirement
Test method
Sampling
Inspection
paragraph
requirement
plan
Rotational torque or operational force (as applicable)
Stops (when applicable)
See 4.4.3.1
Seal (when applicable)
Dielectric withstanding voltage 1/
Contact resistance
1/ For sealed switches, use the dielectric withstanding voltage test of 4.5.14 at atmospheric pressure (sea
level) only. For unsealed switches, use the dielectric withstanding voltage test of 4.5.15.
4.4.4.1.4 Noncompliance. If a sample fails to pass group C inspection, the contractor shall notify the qualifying
activity and the cognizant inspection activity of such failure and take corrective action on the materials or processes,
or both, as warranted, and on all units of product which can be corrected and which were manufactured under
essentially the same conditions, with essentially the same materials, processes, etc., and which are considered
subject to the same failure. Acceptance and shipment of the product shall be discontinued until corrective action,
acceptable to the qualifying activity, has been taken. After the corrective action has been taken, group C inspection
shall be repeated on additional sample units (all inspection, or the inspection which the original sample failed, at the
option of the qualifying activity). Group A and group B inspection may be reinstituted; however, final acceptance and
shipment shall be withheld until the group C inspection has shown that the corrective action was successful. In the
event of failure after reinspection, information concerning the failure shall be furnished to the cognizant inspection
activity and the qualifying activity.
4.5 Methods of inspection.
4.5.1 Visual and mechanical inspection. Switches shall be inspected to verify that the material, interface and
dimensions, marking, and workmanship are in accordance with the applicable requirements (see 3.1, 3.3, 3.4, 3.28,
and 3.30). Only two of the sample units shall be inspected for compliance to interface and dimensions for
qualification.
4.5.2 Contact resistance (see 3.5). Switches shall be tested in accordance with method 307 of MIL-STD-202. The
following details and exceptions shall apply:
a. Method of connection: To two different pairs of mating contacts on each switch module or section. Where the
switch has undergone a life (rotational) test (see 4.5.22.1 or 4.5.22.2 as applicable), the contacts shall have
been subjected to the specified electrical test loads (see 3.1). At least one of the stationary contacts on each
section shall have been subjected to the terminal-strength pull test (see 4.5.8.1).
b. Test current: 100 milliamperes.
c. Maximum open-circuit test voltage: 2 volts.
d. Number of activations prior to measurement: One cycle.
e. Number of tests activations: One for each dial position in which the pair of contacts are mated.
f. Number of measurements per activation: One of each pair of mating contacts under test, except that a
minimum of four shall be made on each switch when possible.
4.5.3 Circuit configuration (see 3.6 and 3.4.7.2). Switches shall be tested to determine conformance to the
applicable diagram using suitable test circuits of an electrical design. The lamp circuit shall be tested electrically.
4.5.4.1 Indicator ring. The luminance of the illumination of the marking and the luminance of the background shall
be measured. The relationship between readings shall be in accordance with the applicable requirements of 3.4.7.1.
4.5.4.2 Luminance. A Photo Research photometric brightness meter or equivalent shall be used. At least three
readings (top-center-bottom) shall be taken on each of three characters spaced equally (or nearly so) around the dial.
The average of all of the readings shall be the brightness and must fall within the limits specified. In addition, no one
individual reading shall be more than 25 percent outside of the specified limits.
14
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business