 Only two PT-6s (s/n 2961 X461E and s/n 2962 NC692W) and one PT-6F (s/n 381 NC16967/NPC44/NC444) were registered, however as many as six of each type may have been built.The discrepancy from many publications with higher numbers may indicate that from two to nine additional airframes were built, but scrapped without being registered or sold, due to the collapse of the aviation market with the deepening of the Great Depression.A production line had been set up, and materials bought to produce 25 examples.