LDC201 POWER FAILURE TEST
LDC201 Power Failure Test
The MIL-STD-704 Aircraft Electric Power Characteristics standard, prepared by the U.S. Department of Defense, defines electrical power
requirements for military aircraft and airborne equipment, including voltage, frequency, phase, ripple, and maximum current.
The most recent revision is MIL-STD-704F_CHG-1, published in 2016. Beyond its use by the U.S. military and its subcontractors,
the standard is widely accepted worldwide for assessing the compliance of military aircraft systems and equipment.
Aircraft power supplied in accordance with MIL-STD-704 is converted to the voltage levels required for the operation of onboard equipment.
To demonstrate conformity with MIL-STD-704, equipment is required to undergo the applicable MIL-STD-704 test sequences to evaluate the effects
of defined power conditions and to verify compliance.
The LDC201 Power Failure Test is performed to verify that 28 VDC utilization equipment continues to operate and maintains the specified
performance when subjected to power interruptions.
Objective Purpose
- To verify, via the LDC201 Power Failure Test, that 28 VDC utilization equipment continues to operate and maintains the specified performance when exposed to power interruptions.
- To evaluate the effects of defined power conditions and ensure compliance by performing the applicable MIL-STD-704 test sequences.
- To confirm that the utilization equipment maintains the required performance during and after power interruptions.
Test Scope Scope
- During the LDC201 Power Failure Test, the utilization equipment is subjected to power interruptions as defined in the applicable MIL-STD-704 revision(s). The equipment is considered acceptable, as indicated in the relevant table, if it operates and maintains performance as specified in the utilization equipment performance specification for transfer aircraft electrical conditions.
- The utilization equipment shall maintain the specified performance throughout the power interruption events.
- Unless otherwise stated in the utilization equipment performance specification, the equipment shall automatically return to its normal aircraft electrical performance once power returns to normal limits.
Technical Approach Process
- During the test, the utilization equipment is exposed to power interruptions as defined in the applicable MIL-STD-704 revision(s).
- The utilization equipment shall maintain the specified performance during power interruptions and, unless otherwise stated in the performance specification, shall automatically return to normal performance when power returns to normal limits.
- During the LDC201 Power Failure Test, the utilization equipment shall not be damaged or create any unsafe condition.
Typical Applications Use
- 28 VDC utilization equipment evaluated within the scope of MIL-STD-704 requirements for military aircraft and airborne equipment (voltage, frequency, phase, ripple, and maximum current).
- Utilization equipment requiring verification of continued operation and maintained performance under power interruption conditions.
- Test activities performed at STEST’s TURKAK-accredited facility in Ankara in accordance with TS EN ISO/IEC 17025.
At our STEST facility in Ankara, accredited by TURKAK, the LDC201 Power Failure Test is performed within the scope of the MIL-STD-704 Aircraft Electric Power Characteristics standard in accordance with TS EN ISO/IEC 17025. For your Environmental, EMI/EMC, and ATP testing requirements to enhance product quality and reliability, you may contact us.
REQUEST A TEST APPOINTMENT| Nominal Limits | 704A | 704B | 704C | 704D | 704E | 704F |
|---|---|---|---|---|---|---|
| Voltage (NLSS) | 24 Vdc | 22 Vdc | 22 Vdc | 22 Vdc | 22 Vdc | 22 Vdc |
| Voltage (NHSS) | 28.5 Vdc | 29 Vdc | 29 Vdc | 29 Vdc | 29 Vdc | 29 Vdc |