John P. DOW, Sr. John Dow, well-known in-flight icing certification consultant and DER, has had a close collaboration with NTI for a number of years, on aviation projects and as a key instructor in NTI’s CFD for inflight certification course. Dow adds to NTI’s expertise his very unique skills and experience in aviation, international aircraft certification and icing, with almost four decades of relevant experience in air transport and general aviation. He was the FAA Senior Icing Specialist and has worked with international aviation authorities, international aircraft manufacturers and aircraft operators. His experience provides an extraordinary blend of theoretical and applied knowledge in icing CFD, wet and dry tunnel testing, and flight-testing in natural and simulated conditions. He has managed successful projects obtaining FAA certification. He has a BS degree in engineering and holds a multi-engine commercial pilot license with instruments rating. Dow was a DER in reliability when he joined the FAA. He was an international project officer working with over 16 countries in certification and continued airworthiness. He was a member of the Ice Protection Harmonization Working Group and taught accident investigation at the Transportation Safety Institute. He also worked in aircraft and power plant manufacturing, and in aircraft modification. John Dow became a DER in icing after his retirement from the FAA. Dow has also worked with manufacturers and national authorities seeking a Bilateral Airworthiness Agreement with the United States. Dow is a regularly scheduled lecturer on icing certification, is the author of many articles on icing and was a major contributor to the recent issue of FAA icing policy. He was a driving force in promoting research and resolution of critical icing issues such as tailplane stall, roll upset, and recharacterization of the icing envelope. John Dow is also a trained accident investigator.