AFGS�87219B
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use.
The requirements in this specification are intended for the development of electrical power systems required by aircraft equipment and subsystems designed to perform combat and support missions in environments unique to military weapons systems. The handbook section (Appendix A) provides rationale, guidance, and lessons learned information that can be used in tailoring requirements to a specific aircraft application.
6.2 Acquisition requirements.
Acquisition documents should specify the following:
a. Title, number, and date of this specification.
6.3 Definitions.
6.3.1 Abnormal operation.
Abnormal operation occurs when a malfunction or failure in the electric system has taken place and the protective devices of the system are operating to remove the malfunction or failure from the remainder of the system.
6.3.2 Electrical power system (EPS).
An electric power system consists of a main power source, emergency power source, stand-alone power conversion equipment, control and protection devices, energy storage devices, and a distribution network (wire, cables, connectors, etc.). The main power source is derived from generators driven by the propulsion system. Emergency power is derived from batteries, ram air turbines, or independent auxiliary power units.
6.3.3 Emergency operation.
Emergency operation is the operation of the electric system following the loss of the main generating equipment. Emergency operation occurs when a limited electric source, independent of the main system, is used to power a reduced complement of distribution and utilization equipment selected to maintain flight and personnel safety.
6.3.4 External power source.
The ground or shipboard power source used to provide power for aircraft startup and ground check and/or maintenance of utilization equipment.
6.3.5 Normal operation.
Normal operation occurs when the system is operating as intended without any fault or malfunction which degrades performance beyond established requirements. It includes all system functions required for aircraft operation except during the electrical starting of the propulsion engines. Electric starting of an auxiliary power unit is considered a normal operation. Normal operations include switching of utilization equipment, engine speed
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