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Un sous-syst\`eme de dimension diff\'erentielle au plus 2 d'une extensionplate est plate. Si un tel syst\`eme plat est stationnaire, il admet dessorties plates ind\'ependantes du temps.  A subsystem of a flat system of differential dimension at most 2 is flat.Furthermore, if such a flat system is stationary, we show that there exist flatutputs not depending on the time.

Un sous-syst\`eme d'un syst\`eme plat de dimension diff\'erentielle 2 est plat. A subsystem of a flat system of differential dimension 2 is flat