US Patent 11788573 Multi-component melt electromagnetic effect protection cap system

A protection cap assembly for enclosing an end portion of a fastener which extends through a structure of an aircraft includes a cap member having a sidewall defining an opening and an interior space wherein the opening is aligned with the interior space for receiving the end portion of the fastener through the opening and into the interior space and an end surface for abutting the structure. The protection cap assembly further includes a projection secured to and which extends from the end surface of the sidewall of the cap member.