Aviation Dictionary

Triple spool engine

Usually a turbofan engine design where the fan is the N1 compressor, followed by the N2 intermediate compressor, and the N3 high pressure compressor, all of which rotate on separate shafts at different speeds.

Dictionary Term

Triple spool engine

Definition

Usually a turbofan engine design where the fan is the N1 compressor, followed by the N2 intermediate compressor, and the N3 high pressure compressor, all of which rotate on separate shafts at different speeds.

References

Airplane Flying Handbook · Federal Aviation Administration · 2021