FRONT COIL SPRING FRACTURE

What NHTSA is examining

The population of 116,000 vehicles is an estimate based on american honda motor company (ahm) data identifying original state of sale or delivery.the subject vehicles (sv) utilize light weight coil springs manufactured from high strength steel (hss).if the coating material of a hss spring is breached, corrosive elements (salt) may attack the spring.spring corrosion results in a stress riser and may cause a fracture.depending on the location where the spring breaks, the jagged edge may pierce the tire; a rapid deflation of the tire may occur and can result in a loss of control or crash.sv spring failure mechanics and tire contact likelihood are discussed in an ahm presentation to odi dated april 20th, 2006 (available on odi?s web site; www-odi.nhtsa.dot.gov).ahm?s presentation identified two mechanisms which cause the spring coating to become breached; 1) contact with the lower spring seat, and 2) entrapment of abrasive materials between the silencer tube and spring.the presentation compared sv spring fracture rates to the honda mdx model, a sister vehicle recalled for front spring fracture under nhtsa recall 05v385, and to other vehicles investigated and or recalled for front spring fracture.the spring fracture rate for the sv, which is about half the rate of the mdx model even though the sv's have one year longer in service, is comparable to rates observed in prior spring fracture investigations that were closed with no recall and low in comparison to investigations that…

Vehicles under investigation