The answer is YES. As a Full B1.1 on the Types, you can sign for B2's experience. To be more clear look into the CAA website but just for simple clarity...... as a B1.1 you can sign for any work performed in Avionics as long as it DOES NOT require using any special Test Equipments. As long as you use the MCDU/CFDS/BITE testing you can sign for it !!!! Hope its helpful!!!