Aircraft Electrical Power System MIL-STD-704 and DO-160 Holdup Requirements

This white paper is the first in a series exploring the standards and design considerations related to MIL-STD-704 and DO-160 power supply hold-up.
 
When designing airborne systems, compliance to certain parameters of the MIL-STD-704 (A-F) or DO-160 (A-G) standards will be required. Systems that are connected to and derive their power from the aircraft electrical power bus are called Utilization Equipment. There are many electric power parameters that must be considered for proper operation of the utilization equipment that is connected to the power bus. This white paper will help system designers to better understand the terminology and requirements specific to the parameter commonly referred to as “holdup”.  It will help readers understand when MIL-STD-704 vs RTCA DO-160 generally applies, and will provide a short, readable summary of the standard. 

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