The sole Northrop 3A prototype disappeared during a test flight over the Pacific on 30 July 1935, and Northrop decided to abandon further development of the 3A.
雪上加霜的是諾斯羅普3A原型機在1935年7月30日在太平洋試飛時失蹤，諾斯羅普因此放棄本系列發展。