Rolls-Royce retires Boeing 747-200 testbed after two decades

The Boeing 747-200 Flying Test Bed (FTB), registered as N787RR, has been retired after 20 years of operation as Rolls-Royce’s primary platform for in-flight engine testing. The aircraft, known as ‘Hefty Bee’, completed its final mission in July, marking the end of an era in aero engine development.

Delivered new to Cathay Pacific in 1980, the 747-200 changed hands between several airlines before Rolls-Royce acquired it in 2005. The aircraft was subsequently modified to accommodate a fifth engine for experimental purposes, supporting development programs for a range of new-generation powerplants.

Throughout its operational life, the FTB supported advancements in engine technology, including flight testing for the Trent 1000, Pearl 10X, and validation of UltraFan components. In 2014, the aircraft enabled successful trials of carbon/titanium fan blades, which later influenced commercial engine designs.

A notable highlight occurred in 2021, when the FTB conducted a test flight using a Trent 1000 engine powered entirely by sustainable aviation fuel (SAF). This flight was instrumental in confirming that all current Rolls-Royce production engines are compatible with 100% SAF, and enabled Virgin Atlantic’s transatlantic SAF flight in 2023.

The aircraft was also adapted to test the Pearl 10X engine for the Dassault Falcon 10X business jet, demonstrating the airframe’s versatility by operating with a mix of Pearl 10X and RB211 engines. Over two decades, the FTB logged more than 2,000 hours of testing, including work on the low-emission ALECSys combustion system, which contributed to the development of the UltraFan demonstrator.

With its retirement, the 747-200 has been relocated to Tucson Airport in Arizona, where it is expected to be donated to a museum. Rolls-Royce will continue engine development on new platforms, following the FTB’s contributions to sustainable propulsion and emissions reduction.

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