This paper describes the Event-B modeling of the landing gear system of an aircraft whose the complete description can be found in [3]. This real-life case study has been proposed by the ABZ'2014 track that takes place in Toulouse, the European capital of the aeronautic industry. Our modeling is based on the Parnas and Madey's 4-Variable Model that permits to consider the different parts of a system. These parts are incremently introduced using the Event-B refinement technique. The entire development has been carried out under the Rodin toolset. To validate and prove the different components, we use the Atelier B, SMT and ML provers which are plugged to Rodin