MIL-DTL-9129G
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use.
6.1.1 Dischargers. Dischargers covered by this specification are for use in the reduction of aircraft precipitation
static discharge interference to radio communications and navigational systems.
6.2 Ordering data. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Military part number (see 3.1).
c. Title, number, and date of the applicable specification sheet (see 3.1).
d. Packaging requirements (see 5.1).
e. If special or other identification marking is required (see 5.1).
6.3 First article inspection. Information pertaining to first article inspection of products covered by this specification
should be obtained from the acquiring activity for the specific contracts involved. Acquisition documents should
specify the following:
a. Title, number, and date of this specification.
b. Military or commercial part number, as applicable.
c. Samples, verification, and test routine, if other than specified (see 4.4.4).
d. Design and construction (see 3.5).
e. Performance requirements (see 3.1).
6.4 Warning. Potentially hazardous situations could develop in some of the test procedures specified in this
specification. Precautions should therefore be taken to insure that test personnel are adequately protected and
observe the necessary safety measures at all times.
6.5 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).
6.6 Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. As of the dating of this document, the U.S.
Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals
is available on their website at https://www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the EPA list of 31
priority chemicals are cadmium, lead, and mercury. Use of the materials on the list should be minimized or
eliminated unless needed to meet the requirements specified herein (see Section 3).
6.7 Subject (key word) listing.
Discharge current
Lightning survivability
Magnetism
Radio frequency discharge noise
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