MIL-STD-704F
power source. It is the responsibility of the airframe manufacturer or modifier to provide the distribution and protection network to the terminals of the utilization equipment while maintaining the power characteristics specified in this standard.
4.1.3 Protective devices. Protective devices shall function independently of control and regulation equipment.
4.2 Aircraft utilization equipment requirements.
4.2.1 Power compatibility. Utilization equipment shall be compatible with the power characteristics specified herein. Utilization equipment shall not require electric power of better quality than specified herein. Utilization equipment shall be compatible with the applicable aircraft specification requirements for control of electromagnetic interference and voltage spikes induced by lightning, electromagnetic pulses, and power switching. Electromagnetic interference and voltage spikes are not covered by this standard.
4.2.2 Operation. When supplied electric power having characteristics specified herein, aircraft utilization equipment shall provide the level of performance required by its detail specification for each operating condition. Operation of utilization equipment shall not cause the power characteristics at its terminals to exceed the limits specified herein. Utilization equipment operation under any electric system operating condition shall not have an adverse effect on or cause malfunction of the electric system.
4.2.2.1 Normal operation. Utilization equipment shall provide the level of performance specified in its detail specification.
4.2.2.2 Abnormal operation. Utilization equipment shall be permitted a degradation or loss of function unless otherwise specified in its detail specification. Utilization equipment shall not suffer damage or cause an unsafe condition. Utilization equipment shall automatically resume full performance when normal operation of the electrical system is restored.
4.2.2.3 Transfer operation. Utilization equipment may not be required to operate under the transfer condition unless a level of performance is specified by its detail specification. Utilization equipment shall automatically resume specified performance when normal operating characteristics are resumed.
4.2.2.4 Emergency operation. Utilization equipment shall provide the level of performance specified in its detail specification when such performance is essential for flight or safety.
4.2.2.5 Starting operation. Utilization equipment shall provide the level of
performance specified in its detail specification when performance is essential during the starting operation.
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