ALEXANDRIA, Va., March 17 -- United States Patent no. 12,576,991, issued on March 17, was assigned to RTX Corp. (Farmington, Conn.).

"Method for forming an inspection access passage for an aircraft propulsion system" was invented by Christopher R. King (Terryville, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for forming an access passage for a gas turbine engine of an aircraft propulsion system includes installing a tooling jig on an engine case of the gas turbine engine at a port at a turbine section radially outward of a turbine vane stage, aligning the tooling jig on the engine case and fixedly mounting the tooling jig on the engine case, and drilling a first access aperture of the acces...