CF6

Overview

The CF6 was GE Aerospace's pioneering entry into the high-bypass turbofan market for large commercial aircraft, first running in 1970 and entering airline service in 1971. Over more than five decades of production and operation, the CF6 family powered virtually every major widebody aircraft type from the 1970s through the 2000s, becoming the workhorse of the wide-body era alongside the Pratt & Whitney JT9D and the Rolls-Royce RB211. The CF6-80C2 variant, entering service in the mid-1980s, became arguably the most versatile large turbofan ever built, certified for applications ranging from the 747-400 to the A310 to the MD-11 and C-5M Super Galaxy military transport.

Developed from GE's TF39 military turbofan (which powered the Lockheed C-5 Galaxy), the CF6 represented a technological leap from the earlier low-bypass and turbojet engines of the 1950s-60s. Its relatively modest bypass ratio of 5–6:1 (depending on variant) was considerably higher than its predecessors, reducing fuel consumption and noise dramatically. Despite being now out-of-production for commercial new builds, the CF6 remains in widespread operation on freighters, military aircraft, and aging passenger fleets, with a robust MRO ecosystem expected to serve operators into the 2030s.

Technical Specifications

Variants

The CF6 family spans fifty years of development across three primary series. The original CF6-6 (40,000 lbf) powered the DC-10-10 at entry into service in 1971. The CF6-50 series (46,500–54,000 lbf) powered the A300 original variants, DC-10-30, and 747-200/SP. The landmark CF6-80A (48,000–50,000 lbf) introduced a new fan and core for the A310 and 767-200/300. The mature CF6-80C2 (52,500–62,100 lbf) became the widest-deployed variant, powering the 747-400, 767-200ER/300ER, A300-600, A310-300, and MD-11. The military CF6-80E1 powers the C-5M Super Galaxy reengining program. The final commercial variant, the CF6-80E1A4 (72,000 lbf), powered the A330-200/300 before being superseded by more efficient alternatives.

Aircraft Applications

• Airbus A300-600R: CF6-80C2A5 (61,500 lbf) — extended-range variant, also operated by many freighter operators
• Airbus A310-300: CF6-80C2A2 (56,000 lbf) — medium widebody for thin long-haul routes
• Boeing 747-400: CF6-80C2B1F (57,900 lbf) — alongside PW4056 and RB211-524G/H, one of three engine options
• McDonnell Douglas DC-10: CF6-6/50 (40,000–54,000 lbf) — launch aircraft for CF6; also served United and American
• McDonnell Douglas MD-11: CF6-80C2D1F (61,500 lbf) — three-engine successor to DC-10, now primarily a freighter

Development History

The CF6 originated from GE's TF39, which powered the Lockheed C-5 Galaxy from 1968 and was the world's first high-bypass turbofan to enter service. GE adapted the TF39 for commercial use as the CF6-6, with American Airlines launching service on the DC-10-10 in August 1971. The CF6-50 represented a significant uprate to power the larger DC-10-30 intercontinental variant and the Airbus A300 — marking GE's entry into the European widebody market. The CF6-80C2, certified in 1985, was a near-complete redesign with a new fan, 14-stage HPC, and improved turbine that achieved substantially better SFC and on-wing life. It became a market standard, powering mixed fleets across multiple aircraft types — a valuable commonality for large operators like FedEx, UPS, and Delta. The CF6-80E1 for the A330 extended production into the 1990s and 2000s. New commercial CF6 production ended around 2020, but GE Aerospace and its licensees continue to manufacture parts and perform engine overhauls. Approximately 3,000 CF6 engines remain in service worldwide, primarily on freighters and military platforms.