MS24656R
NOTE: The following test requirements apply only to those switches with integrated wire terminals. TEST REQUIREMENTS:
Qualification and group B tests are to be performed in accordance with MIL-DTL-8834 except as follows: During all tests switches are to be fully wired with appropriate wire and terminal contacts.
Contact voltage drop: The contact voltage drop with two terminals and the switch contact in series shall not exceed 8 millivolts. This measurement shall be made from one wire contact through the switch contacts to the other wire contact with .1 ampere at a voltage of 2-4 V dc.
Fluid immersion: Two additional qualification and group B switches, fully wired, shall be subjected to three exposure cycles in accordance with a. and b. below.
a. The terminal end of the switch shall be immersed to a depth of .375 (9.53 mm) measured 2 +.5, -0 minutes with a maximum of two minutes between immersions. After each immersion the excess liquid is to be blown off the switch external surfaces with an air jet.
(1) MIL-DTL-83133: Turbine fuels, Aviation, Kerosene Types, NATO F-34 (JP-8), NATO f-35, and
JP-8 + 100 or Commercial Jet A-1
(2) Skydrol 500A: Federal stock number 9150-857-9069.
(3) MIL-PRF-87252 - Coolant Fluid, Hydrolytically Stable, Dielectric.
(4) ASTM-E1119: Glycol, Industrial Grade Ethylene, Standard Specification for. (5) MIL-PRF-7808: Lubricating Oil, Aircraft Turbine Engine Synthetic Base.
b. Exposure to ambient air for 24 ± 2 hours.
c. At the end of the third cycle, the insulation resistance shall be measured and the switches shall be inspected for cracking and loosening of bonds and seams. When switches are tested as specified, the insulation resistance shall not be less than 1,000 megohms and there shall be no evidence of cracking and loosening of bonds and seams.
Toggle seal test: Method II
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