2a. 52-D-6907_Engineering Change Order_21 Sheets.pdf

This is an Engineering Order (EO) for modifications to the Arresting Gear Fairlead Beam 3-Sheaves assembly, drawing number 52-D-6907, dated July 16, 2010. The order specifies several required changes to USAF fairlead beams, including increasing the top plate thickness to 0.5 inches, adding and welding 12 gussets between "tube-stake" locations, drilling holes for anchor rod inspection after fielding, beveling edges of the center plate that contact the top plate, and redesigning the hand hole cover assembly.

The document contains detailed engineering drawings and specifications for all components, including plate thicknesses, hole locations, welding requirements, and assembly instructions. All components are to be manufactured from ASTM A36 hot rolled steel plate, with specific quantities listed for each part (ranging from 1-12 pieces per assembly). The drawings provide precise dimensions and tolerances for the fairlead beam modifications, which are part of the aircraft arresting system used on military airfields.