Aircraft engine supporting pylon

An aircraft pylon support system mounting and supporting aircraft propulsion systems to a fuselage section of an aircraft which comprises:

• an internal, central support box adapted to be disposed within and extend across and through the center of the aircraft fuselage section, and
• external support boxes adapted to extend laterally into pylons disposed at both sides of the aircraft fuselage section and adapted to support the propulsion system, each of said internal and external support boxes being made of a composite material and structured as multi-spar boxes containing lateral spars and at least one central spar,
• wherein the internal central support box and lateral support boxes are connected together to provide a continuous interface therebetween with a full transfer of loads therebetween and between interrupted, intermediate frame members.