CT7

Overview

The GE Aerospace CT7 is a family of turboprop and turboshaft engines derived from the T700, the military turboshaft that powers the Sikorsky UH-60 Black Hawk and Boeing AH-64 Apache helicopters. Developed in the late 1970s as a commercial adaptation of the proven military powerplant, the CT7 entered service in 1984 and has found applications powering regional turboprop airliners as well as a broad range of military and utility aircraft. The CT7's military heritage gives it exceptional proven reliability and a mature global support network unusual for an engine of its power class.

The CT7 delivers 1,700 to 1,870 SHP depending on variant, positioning it in the upper-medium turboprop power range. Its most prominent commercial application is the Saab 340B regional airliner, where the CT7-9B provides the power for a 33-36 seat aircraft that serves thin regional routes across Scandinavia, Australia, and North America. The engine's origins in a high-cycle military turboshaft designed for heavy helicopter operations give it structural margins and time-between-overhaul characteristics that benefit airline operators.

Technical Specifications

Variants

The CT7-5A (1,750 SHP) powers the CASA CN-235 military transport and utility aircraft. The CT7-9B (1,870 SHP) is the Saab 340B variant and also powers the Saab 340A in an earlier rating. The CT7-9C and CT7-9D are growth variants with improved turbine sections. The CT7-9B3 is a flat-rated variant for demanding hot-and-high operations. The parallel turboshaft CT7 variants power several military helicopter types and fixed-wing aircraft, sharing a common core with the turboprop models and contributing to a large common spares pool that benefits operators of all CT7 variants globally.

Aircraft Applications

The CT7's primary commercial application is the Saab 340, a Swedish 33-36 seat regional turboprop produced from 1983 to 1999, with over 450 aircraft built. The Saab 340B, powered by the CT7-9B, is the predominant variant in service and continues to operate with regional airlines in Australia, the United States, and Scandinavia. The CT7 also powers the CASA CN-235 — a Spanish-Indonesian twin turboprop utility transport in widespread military and government service globally — and the Alenia C-27J Spartan tactical transport uses a higher-rated CT7 turboprop derivative. The engine's dual civilian and military application base provides economies of scale in spare parts and support infrastructure that smaller commercial-only programmes cannot match.

Development History

General Electric developed the T700 turboshaft in the 1970s to meet the US Army's requirement for a next-generation engine for the UH-60 Black Hawk utility helicopter programme. The T700 entered military service in 1978, and GE subsequently recognised the commercial potential of adapting the core for turboprop applications. The CT7 turboprop programme launched in the late 1970s, with first run in 1979 and FAA certification in 1983. Entry into service on the Saab 340 followed in 1984. The military heritage of the T700 core provided CT7 operators with a significant benefit: the engine had accumulated extensive flight hours in the most demanding rotary-wing military environments before its commercial introduction, giving it a reliability track record that purely commercial programmes at the same stage of development could not claim. GE has maintained continuous production of both T700 military and CT7 commercial variants across four decades, with ongoing demand from military helicopter procurement sustaining the manufacturing base that supports commercial CT7 operators worldwide.