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AhaBulb: Stuff Everyone Should Know · ahabulb.com/aero-turbofan-bypass

In a turbofan engine, what does the bypass air do?

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  1. It feeds the fire in the combustion chamber
  2. It makes extra thrust and helps quiet the engine
  3. It powers the cabin lights

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References

  1. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C) www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf Checked 2026-10-10.

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