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ATC 286 was issued January 2, 1930 for the Spartan C3-225, a three seat, open cockpit, biplane which had better performance including higher speeds and longer range than its predecessor, the C3-165 with its 5-cylinder Wright “Whirlwind Five” radial of 165 hp. A single C3-166 using a 165 hp 7-cylinder Comet radial would follow C3-225 but never reached production. So the C3-225 would be the last Spartan biplane as the flying public began to desire enclosed cockpit monoplanes.

The C3-225 was marketed to pilots who were salesmen, executives and sportsmen. Many were used as air taxis in the oil fields and one was used for weather research. The prototype, serial number A-1, was registered as X-700N. The thirteen production examples, A-2 to A-14, carried registrations from NC-708N to NC-720N in serial number order.

Standard equipment included a tail skid, dual controls (removable in front cockpit), Hamilton metal propeller, battery, booster magneto, oleo gear, 30x5 Bendix wheels & brakes, adjustable stabilizer navigation lights, heater, Lunkenheimer primer, Air Corps type filter, fire extinguisher and cockpit and engine covers.

Optional equipment included a tail wheel, speed-ring engine cowling, shatter-proof glass in the pilot’s windscreen and a hand-crank inertia starter.

The rear Instrument panel has two dash lamps and luminous dial instruments including a compass, altimeter, tachometer, oil pressure gauge, oil temperature gauge, altitude adjustment, gasoline gauge, air speed indicator and Scintilla magneto switch.

Fuselage – Fabric covered, tandem open cockpits (two people side-by-side in front), metal-lined baggage/tool compartment between cockpits. Constructed of welded chrome-moly steel tubing faired to shape using wooden formers and fairing strips.

Wings – Fabric covered, single bay with parallel streamlined interplane struts, four interchangeable ailerons and no stagger. Constructed using two routed “I” section spruce spars, ribs of spruce & plywood, box compression struts, streamlined wire drag bracing and duralumin leading edges.

Tail group – Fabric covered, chrome-moly steel tubing

Landing gear – Split-axle type with long telescoping oleo strut legs.

Systems – Oil lines and connections painted yellow, fuel lines painted red. Engine controls from cockpit are encased in aluminum. Fuel tank is made of terne plate held in place by brace wires for the upper wing which pass through steel tubes running through the tank.

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