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MIL-STD-704 Aircraft Electric Power CharacteristicsThis standard establishes the requirements and characteristics of aircraft electric power provided at the input terminals of electric utilization equipment. MIL-HDBK-704-1 through-8 defines test methods and procedures for determining airborne utilization equipment compliance with the electric power characteristics requirements defined herein. Electromagnetic interference and voltage spikes are not covered by this standard.

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MIL-STD-704F



500


480


Overfrequency Limit


450


420

400


380


350


300


Underfrequency Limit


250


200


150


100

50


0

0                 1                 2                 3                 4                 5                 6                 7                 8                 9                10               11


Time from Onset of Overfrequency or Underfrequency, Seconds


FIGURE 6.  Limits for 400 Hz AC overfrequency or underfrequency.


20



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