08-20014_BUCKET INTERFACE NBOC MLV.pdf

This is a technical engineering drawing specification for a Bucket Interface assembly (NBOC MLV) used in the NASA Balloon Program. The document contains detailed manufacturing, assembly, and quality control requirements for two subcomponents: a Fusion Coupler Blank Hook (part number not specified, steel material from Caterpillar, 54.0 lbs) and a Pinning Bracket with 2.0 stack thickness and Bucket Interface (part number 08-20014-01, A572 Grade 50 steel, 101.1 lbs) and a Guide Bar for Bucket Interface (part number 08-20014-02, AISI 1045 material, 31.00 length, 35.7 lbs).

The specification mandates all welding and inspections comply with AWS D1.1/D1.1M:2020 standards with ER70S-3, ER70S-3, and E7018 filler metals per AWS A5.1 and A5.18. All welds must be visually inspected and verified using either magnetic particle testing (MT) or liquid penetrant testing (PT). Components require surface preparation including degreasing and rust removal per NASA-STD-5008, followed by application of carboline primer and acrylic topcoat in black (color code C900). Pre-weld machining dimensions must be tagged with part number, unit number, and serial number until components are welded. Critical acceptance criteria include fit checks with mating parts to ensure proper pin insertion through bucket interfaces and caterpillar connections. The drawing is marked "APPROVED," dated 10/3/24 as original release, classified as unclassified, and contains export control notices restricting use outside authorized contractors and embargo countries.