Please fill out the form below for Csmu Assy 4X128 Mb 3V and get a quote for part number 253E156839 by L 3 Communications Avionics Systems, 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 253E156839. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.