MIL-DTL-13791G
3.5.7.3 Fungus resistance. To determine resistance to fungus growth, the distributor will be tested in
accordance with method B, class 1 of ASTM-G21. Subsequently, the distributor must operate as
3.5.7.4 Vibration resistance. The distributor will be tested to determine that mechanical parts will not
be affected by vibration. The test must be conducted under electrical-load for 2 hours in each of three
mutually perpendicular axes. The assembly must operate as specified in 3.5.1 after completion of
vibration testing (see 4.10.12).
3.5.7.4.1 Pitch-filled or oil-filled coil. Distributors with pitch or oil-filled coils will withstand 72 hours of
3.5.7.4.2 Molded or potted coil. Distributors with molded or potted coils must withstand 96 hours of
vibration as specified in 3.5.7.4 and subsequently must operate as specified in 3.5.1 (see 4.10.12.2).
3.5.7.4.3 Coil mounting. Coil mounting tabs, screws, and clamp will not loosen, crack, or break
during 8 hours of vibration of 20 gravity units (g) input while retaining coil as in 6.1 (see 4.10.13).
3.5.7.4.4 Shock resistance. To determine resistance to shock during operation, the distributor will
be mounted and subjected to 18 half-sine waveform pulses that will have duration of 11 milliseconds
(ms) and obtain a peak value of 50 g. Subsequently, the assembly must operate as specified in 3.5.1
(see 4.10.14).
3.5.7.4.5 Electromagnetic interference. The distributor will conform to requirements of classes A3
and C1 of MIL-STD-461 for tactical and combat vehicle components (see 4.10.15).
3.5.7.4.5.1 Resistor-suppressors. Resistor-suppressors, in the output towers of the distributor cap,
will provide the following resistance to high peak voltage pulses specified in 3.5.4 (see 4.10.15.1).
Initial value (ohms)
Value (ohms) after cycling
2750-6250
3750-7500
3.5.7.4.6 High temperature operation. The distributor must operate as specified in 3.5.1 at 200
10ºF ambient air temperature (see 4.10.16).
3.5.7.4.7 Low temperature operation. The distributor must operate as specified in 3.5.1 after the
distributor assembly temperature has been stabilized at minus (-) 65 5ºF (see 4.10.17).
3.5.7.4.8 High temperature stall. The distributor must be operated for 6 hours with 24 V dc applied
to the coil primary in an ambient air temperature of 160 5ºF. The distributor will then operate as
3.5.7.4.9 Low temperature stall. The distributor must be operated for 6 hours with 24 V dc applied to
the coil primary in an ambient air temperature of 65 5ºF. The distributor will then operate as specified
3.6 Finish. The distributor will exhibit no blistering, chipping, peeling, or rust after undergoing tests
(see 4.10.2).
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