08-20002_BOOM Assembly Package.pdf

This document is a comprehensive technical drawing set for the NASA Balloon Program's Multi-Lift Vehicle (MLV) boom assembly for the NROC (Near-Earth Orbit Circular) balloon gondola. The drawings detail mechanical, structural, and hydraulic specifications for constructing and assembling the upper and lower boom sections, including all related components such as wear blocks, mechanical stops, hydraulic cylinders, sensor mounts, and structural elements required for launch, stowing, and operational configurations.

The assembly encompasses detailed machining dimensions for boom components, torque specifications for fasteners (ranging from 18 to 225 ft-lbs depending on fastener type), hydraulic system integration with high-flow couplers and extension cylinders, and safety rail systems. Key structural elements include upper and lower boom platforms, spherical suspension systems, and retractable hydraulic extensions. The drawings specify materials primarily as carbon steel, aluminum alloys, and stainless steel with corrosion protection through zinc plating and paint finishes per NASA STD-5008B specifications. Surface preparation requirements include degreasing, priming with carboline coating systems, and topcoats in military specifications MIL-PRF standards. Assembly procedures detail installation sequences across multiple configurations (stowed, launch preparation, and fully extended operational states), with specific welding requirements per AWS D1.1/D1.1M standards and non-destructive testing protocols including magnetic particle and liquid penetrant inspection. The document contains approximately 46 detailed mechanical drawings with sections, views, and assembly instructions for fabrication and integration of this balloon launch system component.