Mil-b-5087

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Barton Ostby

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Aug 3, 2024, 5:07:36 PM8/3/24

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The MIL-B-5087 document established the 2.5 milliohm bonding requirement. In this overview, learn everything you need to know so that your aircraft is outfitted with compliant lightning protection. Find more aircraft lightning strike protection resources, and download the full PDF document at the bottom of this page.

The following bonding requirements are designed to achieve protection against lightning discharge current carried between the extremities of an airborne vehicle without risk of damaging flight controls or producing sparking or voltages within the vehicle in excess of 500 volts. These requirements are based upon a lightning current waveform of 200,000 amperes peak, a width of 5 to 10 microseconds at the 90-percent point, not less than 20 microseconds width at the 50-percent point, and a rate of rise of at least 100,000 amperes per microsecond.

The mil-b-5087 document was incredibly important in establishing aircraft safety standards for electrical systems and lightning protection. Air travel today is the safest it has ever been, and we owe much of that to the unfortunate work of crash investigators and engineers who helped create better standards after catastrophic aircraft failures.