a separating wall 46 separates this module 36 from the lavatory 34 against this separating wall 46 outside the module 36 is a compartment 48 extending for example over the entire height of the aircraft cabin in its lower portion on the side of the cabin floor this compartment 48 is adapted for accommodating a cart such as the carts 12 of fig1 here it involves a cart taking on the dimensions of a cart used for the aircraft on board service because of its dimensions it involves a cart referred to as u201c demi trolley u201d this cart can be set up in the compartment 48 from the aisle 38 the cart positioned inside the compartment 48 contains medical equipment stored in drawers a shutter that can be locked not depicted on fig2 and 3 is implemented in the separating wall 46 so as to be able to access the drawers of the cart placed in the compartment 48 this cart of course is positioned appropriately in the compartment 48 the cart does not occupy the entire space of the compartment 48 but only the lower portion thereof in the upper portion thereof racks are laid out for accommodating medical equipment these racks are accessed from the inside of the module 36 by means of a shutter itself also able to be locked the separating wall 46 also comprises an opening allowing access to the washbasin 10 of.