Model Variants (Including Prototypes)
Model 15 - Boeing Company Model Designation
XPW-9 (Model 15) - US Army-ordered evaluation models; three produced.
PW-9 - US Army Production Model series designation; 30 produced with D-12 engine.
PW-9A - US Army; fitted with D-12C engine; 25 produced.
PW-9C - US Army; fitted with D-12D engine; 40 produced.
PW-9D - US Army; improved rudder control; 16 produced.
FB-1 - USN / US Marine model land-based version based on the PW-9 model series; fourteen examples delivered.
FB-2 (Model 53) - USN / US Marine Corps variant; 2 examples; carrier-capable; fitted with Packard 1A engine.
FB-3 (Model 55) - USN / US Marine Corps variant for floatplane evaluation; three examples; fitted with Packard 1A engine.
FB-4 (Model 54) - USN / US Marine Corps variant single example; fitted with Wright P-1 radial engine of 450 horsepower.
FB-5 (Model 67) - USN / US Marine Corps variant; fitted with Packard 2A-1500 engine of 520 horsepower; 27 examples produced.
FB-6 - USN / US Marine Corps variant; single example; trialing Pratt & Whitney R-1340-B Wasp engine of 450 horsepower.
FB-7 - Proposed USN / US Marine Corps variant; fitting Pratt & Whitney powerplant; never produced.
XP-4 (Model 58) - Modified PW-9 fitting Packard 1A-1500 engine of 510 horsepower.
AT-3 - Single modified PW-9A example as single-seat trainer; fitted with Wright-Hispano engine.