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Keystone B-3

From PlaneSpottingWorld, for aviation fans everywhere

The Keystone B-3 was a bomber aircraft developed for the United States Army Air Corps in the late 1920s. It was originally ordered as the LB-10A (a single-tail modification of the Keystone LB-6), but the Army dropped the LB- 'light bomber' designation in 1930.

Though the performance of the B-3 was hardly better than that of the bombers flown at the end of World War I, it had come a long way. In terms of its safety, it was far superior to its oldest predecessors.

The B-3A was the last biplane disbanded by the Army; it remained in service until 1940. A few years after it was first produced, a revolution in airplane design rendered it almost completely obsolete.

Units using the B-3

United States Army Air Corps

Specifications (B-3A)

General characteristics



  • Guns: 3× .30-calibre (7.62 mm) Browning machine guns
  • Bombs: 2,500 lb (1,100 kg); 4,000 lb (1,800 kg) on short runs

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