MIL-PRF-8805/104D
Wire exit: Wire lead-potting junction shall be protected from damage resulting from lead-
dress strains. Compliance with this requirement shall be proved as follows:
Three leads shall be tested.
No lead shall be tested in more than one direction.
Forces shall be applied in three mutually perpendicular directions, including the one most
likely to cause failure.
Qualification testing (destructive): A force of 20 pounds shall be applied for a period of 24
hours minimum after which there shall be no break through the insulation at the strain
relief. The force shall be increased in three-pound increments for a duration of five
minutes minimum for each increment. The wire insulation shall be examined for break
through at the strain relief after each five-minute exposure at the increased load. The
test shall be conducted with loads increased up to 42 pounds or until wire breakage.
Permanent deformation of strain relief components shall not occur at loads less than 24
pounds. Wire elongation shall not be considered as cause for failure. Wire breakage
shall not occur at loads less than 20 pounds. There shall be no detrimental effect on the
potting which results in seal failure, or failure to meet the dielectric withstanding voltage
requirements.
Group C (non-destructive): A 15 pound load shall be applied for one minute. There shall
be no permanent deformation of the strain relief members of break through of the wire
insulation, or wire breakage. There shall be no detrimental effect on the potting which
would result in failure to meet the seal and dielectric withstanding voltage requirements.
Marking: Marking shall remain legible after the following test:
a. Soak for a minimum of 72 hours at room temperature in each of the fluids specified
below.
b. After each soak period the specimen shall be wiped dry and then rubbed with a dry
thumb a minimum of 20 times applying moderate pressure. Note: Each test specimen
shall be subjected to soak periods in all the fluids.
c. If metal foil identification plates are used, they shall comply with MIL-DTL-19834. In
addition to the legibility requirement defined herein, the identification plate shall not
become loosened or partially or completely detached from the switch housing during or
after the soak tests.
d. The test fluids to be used shall include:
MIL-DTL-83133, Turbine Fuels, Aviation, Kerosene Types.
MIL-PRF-5606, Hydraulic Fluid, Petroleum Base, Aircraft, Missile, and Ordnance.
MIL-PRF-7808, Lubricating Oil, Aircraft Turbine engine, Synthetic Base.
Part numbers: M8805/104 - (dash number from table IV).
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