Which modification was implemented for engines with very low ground clearance?

• A. They were reconfigured from narrow nacelles to wide, high bypass fan nacelles
• B. They use smaller nacelles
• C. They have a longer intake
• D. They are relocated to sit lower

Answer: (A)

Low ground clearance is all about how far the bottom of the engine and its nacelle sit above the ground, as well as how the external shape interacts with the wing and pylons. Reconfiguring from narrow nacelles to wide, high bypass fan nacelles changes the overall nacelle geometry and the way the engine sits relative to the wing and ground. This newer configuration typically provides a higher lower edge and a more favorable contour, which increases the available clearance and reduces the risk of scraping during operations on aircraft with tight underwing space.

Smaller nacelles would reduce clearance, a longer intake doesn’t change how close the bottom of the nacelle is to the ground, and relocating the engine to sit lower would worsen clearance. So, adopting a wide, high bypass nacelle design directly addresses the clearance constraint by altering the engine’s external profile and mounting geometry.