Keystone B-3

B-3A
Keystone B-3A (S/N 30-281), the first B-3A built.
Role	Light bomber
Manufacturer	Keystone Aircraft
Primary user	United States Army Air Corps
Number built	63 B-3A/B-5
Variants	Keystone B-4 Keystone B-5 Keystone B-6

The Keystone B-3A 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.

Although the performance of the B-3A 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 operated by the US Army; it remained in service until 1940. A few years after it was first produced, the introduction of all-metal monoplanes rendered it almost completely obsolete.

General characteristics

Performance

Armament

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