Please fill out the form below for 4 Elec Hz Sit Ind B and get a quote for part number EFD-74 by Collins Avionics Service Centre, 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 EFD-74. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.