MIL-DTL-38999/31E
QUALIFICATION: Connectors shall meet the qualification requirements of MIL-DTL-38999 with the
exceptions and additions specified below. Group C periodic requalification testing, including the selection
of Group C test samples, shall be in accordance with testing specified in this specification sheet and
MIL-DTL-38999 Group C, 24 month testing.
Durability:
Wired connectors shall meet the durability requirements of MIL-DTL-38999, with the following
exceptions: The total number of cycles of mating and unmating shall be 500, in the following
sequence:
200 cycles of normal mating and unmating, 50 cycles of normal mating with pull-separation
unmating, 200 cycles of normal mating and unmating, 50 cycles of normal mating with pull-
separation unmating. The lanyard release velocity during the pull-separation unmating cycles
shall be 9.15 m/s ± 10%.
Pull-separation at temperature:
In addition to mating and unmating by normal coupling ring rotation, the connector shall be capable of
lanyard-pull-separation at any angle within 15° of the normal axis after exposure for 1 hour minimum at
the following temperatures as shown in table III: Room ambient temperature, -65°C (+ 0°C / -5 °C),
and at the maximum temperature of the specified class. Each pull test will be conducted within three
(3) minutes after removal from the temperature chamber without forced heating or cooling. Maximum
separation forces shall be 400 Newtons for a straight (0°) pull and 445 Newtons for a 15° pull.
Note: The pull-separation test is performed at a relatively low rate using conventional test equipment.
Actual pull rates and pull-separation forces have been found to be much higher when this
connector is used in flight.
TABLE III. Separation test temperatures.
Pull Type
Step 1
Step 2
Step 3
max temperature of
Straight, 0° Pull
-65° + 0° / -5 °C
Room ambient
specified connector class
max temperature of
15° Pull
-65° + 0° / -5 ° C
Room ambient
specified connector class
Fail-safe disengagement:
Connectors shall be partially mated with the plug coupling ring rotated approximately 50 percent of full
coupling. Pull-separation shall be conducted in accordance with the pull-separation at temperature
test requirements specified above.
Vibration:
Wired, mated connectors shall meet the vibration requirements of MIL-DTL-38999 with the following
exceptions:
a. Sine vibration: Connectors shall be subjected to the test specified in method 204, test
condition G, of MIL-STD-202.
b. Random vibration: Connectors shall be subjected to the test specified in EIA-364-28, test
condition VI, letter "J", ambient temperature. Duration shall be 8 hours in the longitudinal
direction and 8 hours in a perpendicular direction, for a total of 16 hours.
c. The Qualifying Activity will define the accessory load and cable to be used in the random sine
vibration tests.
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