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As part of the aircraft certification process, landing gear has to be certified against particular risks such as bird and tyre impact cases. According to international aviation regulations, it has to be demonstrated that the landing gear is designed to ensure the capability for continued safe flight and landing after bird impact or after tyre impact resulting from wheel or tyre failure. Structural parts such as the down-lock mechanism must be validated against these requirements since their structural integrity is essential to ensure landing gear down-locking for landing and subsequent on ground movement. Recently, MESSIER-BUGATTI-DOWTY has been involved in the development of explicit analysis in support of bird and tyre impact justification. A model of the down-lock mechanism has been developed and a full scale test has been set up in order to demonstrate the validity of the analysis.