MIL-PRF-22710H
4.5.9 Strength of mounting bushing (when applicable, see 3.1 and 6.2.2) (see 3.12). Bushing-mounted switches
shall be mounted on a metal panel in the normal mounting means with the specified hardware. Unless otherwise
specified (see 3.1 and 6.2.2), a torque of 25 pound-inches +1 pound-inches shall be applied to the mounting nut.
Switches shall then be examined for damage and loosening and twisting of the bushing relative to the switch front
plate assembly. Damage to nonturn device shall not be considered a failure.
4.5.10 Vibration (see 3.13). Switches shall be tested in accordance with the applicable test methods of MIL-STD-
202, as follows:
For switches of vibration grade 1: Method 201.
For switches of vibration grade 2: Method 204, test-condition letter A.
For switches of vibration grade 3: Method 204, test-condition letter B.
The following details to each applicable test shall apply:
a. Tests and measurements prior to vibration: Not applicable.
b. Method of mounting: Switches shall be mounted, using appropriate mounting hardware, and secured in a
normal manner on a rigid metal panel. The mounting fixture shall be free from resonance over the frequency
range. Switches with mounting brackets shall be supported at the end of the last section.
c. Direction of motion: One of the directions of vibration shall be in a plane perpendicular to the longitudinal axis
of the switch.
d. Electrical load conditions - Unless otherwise specified (see 3.1), the electrical load shall be the monitoring
circuit. The test circuit shall consist of one pair of mated contacts in closed position on each electrical sector
(each pole group of contacts that performs a nonduplicating electrical function), series-connected, with each
switch under test set at a different operating position.
e. Test and measurements during vibration - Switch contact stability shall be continuously monitored during
vibration in accordance with method 310 of MIL-STD-202, except the detection circuit shall be capable of
detecting an open or intermittent contact of 1 microsecond duration or less. In the event of indication of
failure, the vibration cycle shall be continued long enough to monitor contacts, switch by switch, and section
by section, to determine if a switch is defective. If no opening can be found in a switch by switch monitoring,
the switch may be considered to be a good unit.
f. Tests and measurements after vibration: Not applicable.
After the test, switches shall be examined for change in shaft position, and evidence of broken, deformed, displaced,
and loose parts. Failure of lamp shall not constitute failure of the unit.
4.5.11 Shock (see 3.14). Unless otherwise specified, switches shall be tested in accordance with 4.5.11.1 or
4.5.11.1 Method I (specified pulse, for shock type M). Switches shall be tested in accordance with method 213 of
MIL-STD-202. The following details and exception shall apply:
a. Special mounting means: Switches shall be mounted by using appropriate mounting hardware and secured
in a normal manner.
b. Test-condition letter: I.
c. Electrical load conditions: As specified in 4.5.10d.
d. Measurements during shock - Switch contact stability shall be continuously monitored during shock in
accordance with method 310 of MIL-STD-202. In the event of indication of contact opening greater than that
allowed, the test shall be modified by applying successive identical blows in the same plane to monitor
contacts, switch by switch, section by section, to determine if a switch is defective.
After the test, switches shall be examined for change in shaft position, and evidence of broken, deformed, displaced,
and loose parts. Failure of lamp shall not constitute failure of the unit.
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