Northern Air Cargo Boeing 737-200 w/ gravel kit N322DL | Flickr
Tom Podolec Aviation on X: "PHOTOS Up close look at the gravel kit installed on this Nolinor Aviation Boeing 737-200. It prevents rocks and other debris from entering the engine (vortex dissipator)
Agile Operator - Skies Mag
Air North Boeing 737-200 combi plane's gravel kit - part 1… | Flickr