MIL-PRF-22885H
6.4.10 Legend. The inscribed message (words, numbers, symbols, etc.) on the face of the switch which conveys
switch function to or signals the operator.
6.4.11 Sunlight readable. A switch with a legend which is visible under direct sunlight conditions when illuminated
and hidden when not illuminated.
6.4.12 Cycle of operation. A cycle of operation is the movement of the actuating means through the entire range
of its travel causing the switch contacts to change from one position to another position and then return to their
original position. Each stroke of the actuating means includes a full range of travel from free position to full overtravel
position and return to the fully released position.
6.4.13 Intermetallic contact. The finishing of metallic areas to be placed in intimate contact by assembly presents
a special problem, since intermetallic contact of dissimilar metals results in electrolytic couples which promote
corrosion through galvanic action. To provide the required corrosion protection, intermetallic couples are restricted to
those permitted by MIL-STD-889.
6.4.14 Gold contacts. Gold contacts are contacts in which the mating surfaces are gold or gold alloy throughout
the rated life of the switch. (In some instances, gold plating may be used for shelf life or multi-rating capability and is
fully expected to be destroyed during life.)
6.4.15 Silver contacts. Silver contacts are contacts in which the mating surfaces are silver or silver alloy
throughout the rated life of the switch.
6.4.16 Major defect. A defect that could result in a failure or that will reduce the usability of the switch for its
intended purpose.
6.4.17 Minor defect. A defect that is not likely to reduce the usability of the switch for its intended purpose. It may
be a departure from established standards having no significant bearing on the effective use or operation of the
switch.
6.4.18 NVIS. A system which uses image intensifier tubes to produce an enhanced image of a scene in light
conditions too low for normal navigation and pilotage.
6.5 Human engineering. Government contracts commonly specify that military standard components be used and
that MIL-STD-1472, Human Engineering Design Criteria For Military Systems, Equipment and Facilities, applies. Due
to performance and environmental requirements, or other factors, military specification switches frequently do not
meet the requirements of MIL-STD-1472. To provide the desired operability, it is suggested that equipment
designers select the specification switches which can most closely conform to the human interface requirements of
MIL-STD-1472 without sacrificing reliability.
6.6 Subject term (key word) listing.
Controls
Fluorosilicone
Legend
Light, indicator
NVIS
Polytetrafluorethylene
6.7 Part or Identifying Number (PIN). See 1.3.
6.8 Dissimilar metals (see 3.5.1.2). Dissimilar metals and compatible couples are defined in MIL-STD-889.
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