25 years on , it is still setting new standards of reliability and durability .
The RB211 is the first , and at present the only , three - shaft , high bypass ratio aero engine in the world to go into production .
25 years on , RB211 is still setting new standards of reliability and durability .
The RB211 is the first , and at present the only , three - shaft , high bypass ratio aero engine in the world to go into production .