March 2016 | Certification
The risk assessment methodology for runway strips with insufficient bearing strength was published in the present issue of Ingenieurspiegel. In the context of aerodrome certification pursuant to EASA CS ADR-DSN, runway strips have to provide a minimum bearing strength in order to minimize the hazard of an aircraft running off the runway (veer off). Purpose is preventing collapse of the (nose) landing gear and providing drag to these aircraft to reduce accident location. The methodology assesses risks based on occurrence probabilities of veer off incidents/accidents and potential personal injuries and material damage. Regarding this damages to aircraft are investigated by using a detailed flight-mechanical model based on wheel-soil interaction (generally characterized by wheel sinkage and rolling drag). This methodology ensures an valid calculation and assessment of risks by regarding the airport’s individual infrastructural and operational conditions. If necessary, risk mitigation measures will be developed in order to provide evidence that safe aircraft operations can be guaranteed despite guideline deviations.