BR715

概要

The Rolls-Royce BR715 is a medium-thrust turbofan engine produced under the BMW Rolls-Royce joint venture — with BR standing for BMW Rolls-Royce — and serves as the exclusive powerplant for the Boeing 717-200. The engine represents a remarkable niche success story: despite powering only approximately 156 aircraft over a limited production run, the BR715 achieved and maintained exceptional dispatch reliability, earning a reputation among operators as one of the most dependable jet engines in commercial service.

The 717-200 is the commercialized successor to the McDonnell Douglas MD-95, a program that Boeing inherited through its 1997 merger with McDonnell Douglas. Boeing initially planned to cancel the program but continued it to completion, delivering the final 717 in 2006. The BR715's sole-source position on this narrowbody type means every 717 still flying — a fleet that exceeds 100 aircraft largely with Delta Air Lines and Volotea — relies on Rolls-Royce for engine support.

技術仕様

派生型

The BR715 was produced in two thrust variants matched to the 717's weight requirements:

• BR715-55: Baseline variant producing 93.4 kN (21,000 lbf), used on standard-weight 717-200 operations. Certificated in 1998 and the primary production variant for initial deliveries to AirTran Airways and launch customer Midwest Express.
• BR715-58: Higher-thrust variant producing 98.1 kN (22,050 lbf) for higher-gross-weight operations, including hot-and-high airports. Used on 717s operating in warm climates and high-altitude environments where standard thrust margins would be insufficient.

Both variants are maintained under a common type certificate and share identical MRO procedures, simplifying fleet management for operators with mixed thrust-rating fleets.

搭載機

The BR715 powers a single aircraft type, where it is the only available engine option:

• Boeing 717-200 — The 717-200 seats 106–134 passengers in a 2-3 layout and targets the 500–1,500 nm stage length market. After AirTran Airways was acquired by Southwest Airlines in 2011 and Southwest's 717 fleet was subsequently transferred to Delta, Delta became by far the largest 717 operator with over 80 aircraft. Delta has expressed long-term commitment to the type, citing its economics on short-haul spoke routes. Volotea (Europe) and Hawaiian Airlines also operate the type. The rear-mounted BR715 configuration keeps the wing clean and contributes to the 717's notably quiet cabin — a passenger experience differentiator on routes where it competes with 737-700 and A319.

開発の歴史

BMW and Rolls-Royce established their joint venture in 1990, with BMW contributing capital and manufacturing capability while Rolls-Royce provided turbomachinery design expertise. The BR710 (powering the Gulfstream G550 and Bombardier Global Express business jets) was the venture's first product; the BR715 followed as a scaled-up version for the narrowbody commercial market.

McDonnell Douglas selected the BR715 for its MD-95 program in 1995, giving BMW Rolls-Royce its first narrowbody commercial engine contract. The engine completed its first run in October 1996, with FAA and JAA certification achieved in 1998. Boeing's acquisition of McDonnell Douglas in 1997 created uncertainty about the MD-95/717 program, but Boeing ultimately honored the commitments and the 717 entered service with AirTran Airways in October 1999.

BMW eventually divested its stake in the engine venture, and the program reverted to full Rolls-Royce ownership, with the BR designation retained as a legacy identifier. Production of the BR715 ended with the last 717 delivery in May 2006. Rolls-Royce's ongoing support for the in-service fleet represents a long-term aftermarket commitment extending well into the 2040s, as Delta and other operators continue to invest in the 717's service life. The engine's exceptional dispatch reliability record — cited by Delta as a key retention reason — ensures a commercially viable MRO business despite the relatively small fleet size.