Schweizer used the 269 airframe as the basis for its contender in the 1990 Army competition for a TH-55 replacement. The Schweizer 330 has an enlarged cabin, seating four, and a fully-clad fuselage and faired-in tailboom with a larger tail unit. The main change, however, is the move to a 200shp Allison 250 turboshaft engine. As it turned out, Schweizer did not win the U.S. Army competition, but the Model 330 is in production for civil customers and is built at Elmira next to several versions of the Model 300.

Schweizer-built 3/4 seat light helicopter derived from 300 with 0.38m wider cabin, faired in tail section, tail fin and tailplane with finlets, pointed nose, 992kg TOGW and 420shp Allison 250-C20W turboshaft engine. Prot. N330TT FF 1988. Contender in U.S. Army NTH competition.

R.Simpson "Airlife's Helicopter and Rotorcraft", 1998

Technical data for Schweizer 330SP

Crew: 1, passengers: 2-3, engine: 1 x Allison 250-C20W turboshaft, rated at164kW, main rotor diameter: 8.31m, tail rotor diameter: 1.30m, take-off weight: 1025kg, empty weight: 517kg, max speed: 200km/h, cruising speed: 185km/h, hovering ceiling (IGE) with max take-off weight: 2530m, hovering ceiling (IGE) with 900kg take-off weight: 4146m, hovering ceiling (OGE) with max take-off weight: 1829m, hovering ceiling (OGE) with 900kg take-off weight: 3415m, range: 590km, endurance: 4.19h