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 LDC301 Voltage Steady State Limits Test is performed to verify that 28V DC power handling equipment operates and maintains specified performance when powered within the Abnormally Low Steady State (ALSS) limits and Abnormally High Steady State (AHSS) limits. This test takes a minimum of 30 minutes.

In the LDC301 Voltage Steady State Limits Test, if the usage equipment operates and maintains performance as specified in the usage equipment performance specification document for abnormal aircraft electrical conditions when supplied with voltage input power at the specified abnormal steady state limits of the applicable version(s), the usage equipment has passed MIL-STD- 704 and are accepted as specified in the table.

LDC301 Voltage Steady State Limits Test use equipment shall maintain specified performance for a period of time verifying that the use equipment can operate continuously at steady state voltage and shall not be less than thirty (30) minutes for each of the test conditions.

In the LDC301 Voltage Steady State Limits Test, the usage equipment must demonstrate restart at abnormal steady state voltage limits unless otherwise specified in the usage equipment performance specification document. Unless otherwise specified in the LDC301 Voltage Steady State Limits Test usage equipment performance specification document, when power returns to normal limits, usage should automatically return to performance specified for normal aircraft electrical conditions. The equipment used in the LDC301 Voltage Steady State Limits Test must not be damaged or cause an unsafe condition.