MIL-STD-704 Aircraft Electrical Power Specifications Standard, prepared by the United States (US) Department of Defense, is a military standard that covers issues such as voltage, frequency, phase, fluctuation and maximum current in a military aircraft and its equipment. The most current version of the standard is MIL-STD-704F_CHG-1, published in 2016. However, this standard is not a standard that only covers the US military and its subcontractors, but is a globally accepted standard for evaluating the suitability of military aircraft and systems. It is converted to the voltage levels required for the operation of the equipment used in the aircraft power system, which comes with a power source that complies with the MIL-STD-704 standard. In order for a piece of equipment to operate in accordance with the MIL-STD-704 standard, it must pass MIL-STD-704 tests to see its effects under difficult conditions and to verify its conformity.

The LDC601 Power Failure Test is performed to verify that 28V DC power handling equipment will not be damaged or cause an unsafe condition following aircraft power outages.

In the LDC601 Power Failure Test, if the usage equipment operates and maintains performance as specified in the usage equipment performance specification document for power outage aircraft electrical conditions when subjected to power interruptions as specified in the relevant editions of MIL-STD-704, the usage equipment is considered to have passed as specified in the table . 

LDC601 Power Failure Test operating equipment must maintain specified performance during power outages. Unless otherwise specified in the LDC601 Power Loss Test operating equipment performance specification document, operating equipment must automatically return to specified performance for normal aircraft electrical conditions when power returns to normal limits. The equipment in use with the LDC601 Power Failure Test must not be damaged or cause an unsafe situation.