These worked by blowing bleed air from the engines to break up vortices. These prevent vortices forming, which could cause gravel to be ingested by the engine. Vortex dissipators were fitted below the engines.Teflon based paint applied to wing and the underside of the fuselage.Reinforcement on the underside of flaps.Metal shields placed over brake cables and hydraulic tubing on the landing gear.Additionally, smaller deflectors added to the main landing gear to protect the flaps. This required modification to automatically align the deflector when the gear was lowered. Deflectors added to the nose gear to keep gravel from the underside of the aircraft.These details for the kits are based on coverage at The 737 Information Site. So what modifications were made to the aircraft? The kits offered several changes and additions to the 737, designed to protect the fuselage and engines from gravel damage, and also to reduce wear and maintenance expense. Photo: Unknown via Wikimedia Modifying the 737-200 Gravel runway at Whitehorse airport, Yukon, Canada.
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