International audienceThis paper presents experiences in using several model checking tools to verify properties of a critical real time embedded system. The tools we tested are Lesar, SMV, Prover Plug In for SCADE and Uppaal. The application is the landing gear control system of a military aircraft, developed by Dassault Aviation. The property to be verified states that the gear must be down in at most 14 seconds. Results (success and verification time) depend a lot on the way time is handled by the verification tools
