MIL-DTL-9419G
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but not
mandatory)
6.1 Intended use. The switches covered by this specification are intended for mounting in aircraft
control wheels and grips and serves as the electrical trim tab control. However, it may be used in other
applications, provided the parameters set forth herein are not exceeded.
6.2 Ordering data. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Detail specification sheet part number.
6.3 Definitions.
6.3.1 Operation. An operation consists of a mechanical actuation of the toggle lever from the "center
off" to one "on" position and free return of toggle lever to "center off".
6.3.2 Cycle. A cycle consists of mechanical actuation of the toggle lever from the "center off" after
each "on" position in consecutive rotation, in order that contact is made in each of the four positions
during each cycle.
6.3.3 Free break. After mechanical actuation to make the circuit, the toggle lever will return to "center
off" position by its own action, thus breaking the circuit.
NOTE: Any sticking of the lever in "on" position constitutes failure.
6.3.4 Direct acting and positive action. The use of these terms in this specification will mean the direct
attachment to the actuator lever or direct manual control of the common contact rather than dependence
upon an intermediate spring or toggling member between the actuator and moving contact to effect
opening or closing of the circuit.
6.3.5 Snap/tactile feel force characteristic. The switch assembly will incorporate an actuator travel
dependent-actuation restraining force characteristic which provides both a positive tactile feedback to the
user when electrical activation of the switch has been achieved and a restraining force threshold to
prevent unintentional activation.
6.3.6 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may
exhibit tin whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to
years after manufacture and can develop under typical operating conditions, on products that use such
materials. Conformal coatings applied over top of a whisker-prone surface will not prevent the formation
of tin whiskers. Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin whiskers. For
additional information on this matter, refer to ASTM-B545 (Standard Specification for Electrodeposited
Coatings of Tin).
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