Please fill out the form below for Duct Assembly Air C and get a quote for part number L5351233-021 by Boeing Company The with NSN 1660012039650 and FSC Name is 1660 Aircraft Air Conditioning Heating and Pressurizing Equipment, 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 L5351233-021. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.