Ice collection seen on un-heated sections of the 1D2D-X ice drop detection probe in the test section of the IRT (Icing Research Tunnel). Drop Size Probe testing - SFD (Subsonic Flight Demonstrator) of SLD (Supercooled Large Drop) Instrumentation Test in IRT (Icing Research Tunnel) – Particle Size Distribution Entry, June 8-11, 2026 Large Drop Testing in IRT