Variants
- XLB-6
- One LB-5 modified for evaluation.
- LB-6
- Production version with Wright R-1750-1 Cyclone radial engines of 525 hp (391 kW), 17 built in 1929.
- LB-7
- LB-6 with 525 hp (391 kW) Pratt & Whitney R-1690 engines, 18 built in 1929 and three LB-6s re-engined as LB-7s in 1930.
- LB-8
- One LB-7 re-engined with 550 hp (410 kW) Pratt & Whitney R-1830 engines for evaluation.
- LB-9
- One LB-7 re-engined with 575 hp (429 kW) Wright GR-1750B geared engines for evaluation.
- XLB-10
- One LB-6 re-engined with 525 hp (391 kW) R-1690-3 engines.
- LB-10
- Production version of the XLB-10, 63 built, all redesignated B-3A prior to delivery. 36 built as B-3A with Pratt & Whitney engines; remaining 27 became B-5 with Wright engines.
- LB-11
- One LB-6 re-engined with 525 hp (391 kW) R-1750-3s for evaluation.
- LB-11A
- LB-11 re-engined with 525 hp (391 kW) GR-1750s for evaluation.
- LB-12
- Similar to the LB-7, with 575 hp (429 kW) R-1830-1s for evaluation.
- LB-13
- Seven aircraft delivered as the Y1B4-1 (5) and Y1B6-1 (2).
- LB-14
- Production version with 575 hp (429 kW) GR-1830 engines, three delivered as the Y1B5-1.
- ZLB-6
- 1931 designation of two LB-6 and the LB-11 (in 1933) as training aircraft.
- ZLB-7
- 1931 designation of ten LB-7 as training aircraft.
Read more about this topic: Keystone LB-6
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