the aircraft were delivered between may 1912 and january 1913 and were subject to approval of ten flight tests by the army before acceptance. the first delivered, to have been s.c. 10, crashed during its climbing test on june 11, 1912, killing wright company pilot arthur l. welsh and lt. leighton w. hazlehurst, and was replaced in october by another wright c, itself destroyed in the last fatal crash on february 8, 1914. the crash involving welsh was found by the army's board of inquiry to have been pilot error by welsh, who had intentionally placed the aircraft 45 degrees nose down prior to the test to build momentum. deliveries of the plane continued, although the statement of one eyewitness led to speculation that the elevator had not responded to inputs to pull out of the dive.