Step -Shaft Maintenance concept in Engine

[hawkeyecheck]

Would anybody help me out to know ...what is step shaft maintenance concep in turbofan engine...!!1

Thanks

Wish everybody a happy new year....!!

[Capot]

Are you in the right forum?

Engineers are allowing Dudley’s unique and vast underground cavern the Step Shaft mine to be opened up for possibly the last time.

There's quite a lot of maintenance being done there, I understand.

[Runaround Valve]

Do you mean the drive shaft or drive leg that connects the high speed turbine shaft to the accessory gear box. Such as on the RB211. ???