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The Keystone LB-5A was the production version of the service test LB-5. Twenty-five aircraft were purchased by the Army Air Corps in 1928. The LB-5A had a twin vertical tail design which differed from the triple tail design of the LB-5. The aircraft used surplus Liberty engines left over from World War I and had performance only marginally better than WWI aircraft.
The LB-5 and LB-5A formed the basis for the remainder of the LB-series aircraft; all built by Keystone. The LB-6 to LB-14 all had radial engines and various minor modifications to the wings, fuselage and tail, but the standard practice of the 1920s and 1930s usually resulted in a completely new designation for the aircraft.
Armament: Five .30-cal. machine guns and 2,312 pounds of bombs
Engines: Two Liberty V-1650-3s of 420 hp each
Top speed: 107 mph at sea level
Service ceiling: 8,000 ft.
Range: 435 miles with full bomb load
Span: 67 ft.
Length: 44 ft. 8 in.
Height: 16 ft. 10 in.
Weight: 12,155 lbs. gross
Serial numbers: 28-1 to 28-25
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