Please fill out the form below for Sling Beam Type and get a quote for part number 25-63390-4 by The Boeing Company with NSN 3940004955411 and FSC Name is 3940 Blocks Tackle Rigging and Slings, please include required quantity along with expected turn around time. Our knowledgeable account manager will reply you shortly. Also check for the related parts for part number 25-63390-4. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.