MIL-DTL-3970F
6.4.2 Acquiring activity. The activity responsible for all rigid waveguide assemblies acquired under this
specification is the acquiring activity. This activity is responsible for all waivers of first article testing.
6.5 Subject term (key word) listing.
Bends
Pressurization
Corners
Radio frequency
Dissimilar metals
Transmission lines
Flanges
Twists
Insertion loss
Voltage standing wave ratio (VSWR)
6.6 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. Conformance 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 (see 3.3.4). For additional information, refer to ASTM-545
(Standard Specification for Electrodeposited Coatings of Tin).
6.7 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
and additional information is available on their website at https://www.epa.gov/osw/hazard/wastemin/priority.htm.
Included in the 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).
6.8 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where
changes from the previous revision were made. This was done as a convenience only and the Government assumes
no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the
requirements of this document based on the entire content irrespective of the marginal notations and relationship to
the last previous issue.
Custodians:
Preparing activity:
Army - CR
DLA - CC
Navy - EC
Air Force - 85
(Project 5985-2012-008)
DLA - CC
Review activities:
Army - AR, MI
Navy - AS, CG, MC, OS, SH
Air Force - 99
NOTE: The activities listed above were interested in this document as of the date of this document. Since
organizations and responsibilities can change, you should verify the currency of the information above using the
ASSIST Online database at https://assist.daps.dla.mil.
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