MIL-DTL-38999/31E
Ice resistance:
The mated, wired connectors with accessories attached shall be placed in a chamber and the
temperature reduced and stabilized such that the item is maintained at -18°C (tolerance of +0°C, -5°C)
for 1 hour. After stabilization of the chamber temperature, the test item shall be sprayed with water
precooled to 2°C (tolerance of +5°C, -0°C), for a period of five (5) minutes. The test item shall be
located a maximum of 305 mm (12 inches) from the spray nozzle. The entire test item shall be
exposed to the spray. After completion of water spray, the test item shall remain in the chamber at -
18°C (tolerance of +0°C, -5°C) for an additional 30 minutes. Upon completion of the 30 minute cold
soak period, the test item shall be removed from the chamber and immediately (within two (2) minutes)
subjected to uncoupling by use of the lanyard mechanism. The force required to separate the
connector shall not exceed the 400 Newton straight pull and the 445 Newton 15° pull by more than 50
percent.
Dust (fine sand):
Upon completion of the dust test, the test items shall be removed from the chamber and immediately
subjected to uncoupling by use of the lanyard mechanism. The force required to separate the
connectors shall not exceed the required values specified for pull-separation by more than 25 percent.
External bending moment:
Wired connectors shall meet the external bending moment requirements of MIL-DTL-38999 with the
following exceptions: Size 25 shall be 28.3 Newton-meters.
Changes from previous issue. The margins of this specification are marked with vertical lines to indicate
where changes from the previous issue 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.
Referenced documents. In addition to MIL-DTL-38999, this document references the following:
MIL-DTL-38999/20
MIL-DTL-38999/24
MIL-STD-202
MIL-STD-1560
EIA-364-28
SAE-AS85049
CONCLUDING MATERIAL
Custodians:
Preparing activity:
Army CR
DLA - CC
Navy - AS
Air Force 85
(Project 5935-2013-148)
DLA - CC
Review activities:
Army - AR, MI
Navy - EC, MC, OS
Air Force - 19, 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.dla.mil.
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