MIL-DTL-62186C
3.4.13 Torsion. The alternator shall meet the torsion requirements as specified
in 3.4.13.1 through 3.4.13.3.
3.4.13.1 Natural frequency. The natural torsional resonant frequency of the rotor and
shafting system shall be between 100 and 140 hertz (Hz).
3.4.13.2 Vibratory torque. The alternator shall withstand a vibratory torque in
accordance with figure 2 for a period producing 12 000 torque reversals, without sustaining
damage.
3.4.13.3 Torsional application. The alternator shall withstand operation on an
engine-transmission assembly conforming to Drawing 11655426 for 192 hours without
sustaining damage, and without degrading the system drive train or compromising engine-
transmission assembly performance.
3.4.14 Electromagnetic interference (EMI). The alternator s broad-band conducted and
radiated emissions shall be not greater than the limits as specified in figures 3 and 4.
3.5 Interface requirements. In addition to meeting the interface requirements and
envelope dimensions as specified in Drawing 11655469 (see 3.2), the alternator shall be as
specified in 3.5.1 through 3.5.3.
3.5.1 Installation compatibility. The alternator shall fit and function as specified
in 3.4 when installed on an engine conforming to Drawing 11682700.
3.5.2 Regulator. The alternator shall fit and function as specified in 3.4 when operating
with a regulator conforming to MIL-DTL-62187.
3.5.3 Weight. The alternator shall be no greater than 100 pounds (lb)
(45 kilograms (kg)).
3.6 Support and ownership requirements. The alternator shall possess the life cycle
ownership characteristics as specified in 3.6.1 and 3.6.2.
3.6.1 Endurance. The alternator shall withstand operation as specified in table I, with the
oil inlet pressure as specified in table II, using contaminated oil, without sustaining damage, and
without requiring servicing or the replacement of parts.
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