The Tomashevich Pegasus, identified by the ICAO type code TMSH, is an aircraft for which there is no verifiable evidence of existence in official civil or military aviation registries. Extensive searches of authoritative sources, including the International Civil Aviation Organization (ICAO) Doc 8643 online search tool, yield no results for the designator TMSH. This absence is further corroborated by general type-code aggregators such as The Aviation Codes Web Site and comprehensive lists of aircraft type designators, confirming that no officially recognized aircraft type is registered under this specific code.
While the name 'Pegasus' appears in other aviation contexts, these are unrelated to a Tomashevich-manufactured aircraft. For example, the KC-46A Pegasus is a Boeing-built tanker utilized by the United States Air Force, but its ICAO designators are derived from the Boeing 767 family rather than the TMSH code. Additionally, Pegasus Airlines is a Turkish low-cost carrier with the ICAO airline code PGT, which bears no connection to an aircraft manufacturer named Tomashevich.
Historical records do mention Dmitry Lyudvigovich Tomashevich, a designer known for his contributions to early Soviet jet projects. However, standard Soviet and Russian aircraft references contain no documentation of an aircraft named 'Pegasus' designed by him, nor is such a project linked to the TMSH designator in any official capacity. Due to the lack of certification records, design bureau archives, or technical publications, there is no available data regarding the aircraft's production history, engine specifications, or performance metrics. No examples of a Tomashevich Pegasus are listed in global museum collections or preservation registers, leading to the conclusion that the designation is likely fictional, experimental, or limited to non-official internal systems.