according to fig1 a smoke simulator system 1 for an aircraft cockpit ( not shown ) comprises a water tank 2 with the shape of a circular tube . the diameter of said water tank 2 is about 100 mm . the water tank 2 is water tight and made of plastic material . an ultrasonic - generator 3 is located inside the water tank 2 on a lower cover 4 . the lower cover 4 is tightened by means of a gasket to the water tank 2 . the ultrasonic - generator 3 is provided with diaphragm discs 5 for generating ultrasonic waves . in operation of the system 1 the ultrasonic - generator 3 is submerged with its diaphragm discs 5 inside a water sump . a fluid sensor 6 is provided to detect the water level above the diaphragm discs 5 of the ultrasonic - generator 3 . a common tuning of the system 1 will be that the water level in the water tank 2 is at least 20 mm above the diaphragm discs 5 of the ultrasonic - generator 3 ; an automatic switch off function ( not shown ) will be activated by the fluid sensor 6 if the water level goes below said minimum . the water tank 2 is provided with supply means 7 such as a cable port pointing upward . said cable port 7 may be used to refill distilled water a little enriched with special nontoxic fog fluid . said cable port 7 may be used as well as an inspection hole for the water tank 2 . outlet means 8 such as an outlet port of the water tank 2 comprise an extension tube 9 and a manifold 10 with four manifold tubes 11 serving as smoke outlet . said extension tube 9 is pointing up about 45 ° from the outlet port 8 and has a diameter of approximately 70 mm . a sump drain hole 12 is provided at a lowest area of the extension tube 9 . a venturi t - fitting 13 is installed with its inlet side in the sump drain hole 12 . an airtube 14 is connected to an outlet side of the venturi t - fitting 13 said airtube 14 reaching into the water tank 2 above the diaphragm discs 5 of the ultrasonic - generator 3 . an air pump 15 driven by an electric diaphragm pump 16 provides enough pressure in airtube 14 to reach a venturi effect in the venturi t - fitting 13 for transfer of condensate from the sump at the lowest area of the extension tube 9 to the water tank 2 . an airfilter 17 is fitted on an inlet port 18 of the electric diaphragm pump 16 . a fan 19 is installed in a top cover 20 on top of the water tank 2 . a microcontroller ( not shown ) is provided with a time relay ( or time relais ) to control the operation of system 1 for customized smoke production according to the situation and any air volume of the cockpit and a predefined maintenance cleaning program . a remote receiver circuit ( not shown ) is provided to switch off system 1 if there is an input from the simulator extinguisher or a real fire alarm . according to fig2 a fire extinguisher 21 is provided with a remote trigger function to switch off system 1 with a trigger switch ( not shown ) if a discharge valve of said fire extinguisher 21 is actuated by a handle 22 . the fire extinguisher 21 is equipped with an electronic chamber 23 with a remote module 24 and an output to an antenna 25 . the signal from the trigger switch is communicated via the remote module 24 and the antenna 25 . a battery 26 is provided for supply of the remote module 24 . a charge connector 27 in the casing 28 of the fire extinguisher 21 is connected to the battery 26 for charging . the fire extinguisher 21 comprises a pressure tank 29 and a pressure gage 30 indicating the pressure in the pressure tank 29 . pressurized air can be delivered from the pressure tank 29 through nozzle 31 if handle 22 is actuated . a normal cockpit rotorcraft / aircraft fire extinguisher may be modified to comprise the features described before and marked with a label to be used as “ for simulation only ”. the system 1 comprises a supplemental control via simulation computers ( not shown ). distilled water is filled into the water tank 2 via the cable port 7 till the ultrasonic - generator 3 is entirely submerged . low current electric energy is supplied to the ultrasonic - generator 3 . the ultrasonic - generator 3 is switched on and the smoke produced by the submerged diaphragm discs 5 of the ultrasonic - generator 3 is discharged through the outlet port 8 of the water tank 2 by its gravity because the generated smoke is heavier than the ambient air . the fan 19 inside the top cover 20 is actuated to produce supplemental pressure to press the smoke from the outlet port 8 further through the manifold tubes 11 of manifold 10 to route the smoke to predetermined locations inside the cockpit . water condensation in the extension tube 9 due to smoke generation is collected next to a sump drain hole 12 and pumped back via an airtube 14 using a venturi effect to the water sump submerging the ultrasonic - generator 3 . if system 1 is not switched off by means of its remote receiver circuit the special cockpit fire extinguisher 21 may be actuated with its installed remote switch . when the handle 22 of the special cockpit fire extinguisher 21 is actuated the air filling compressed in the pressure tank 29 is ejected through the nozzle 31 to stop the smoke with real discharge sound like in a real fire fighting process . a signal is provided from the trigger switch after actuation of the handle 22 and said signal is sent by means of the remote module 24 and the antenna 25 to switch off system 1 .
a smoke simulator system for an aircraft simulator cockpit said system comprising a water tank , an ultrasonic generator , said ultrasonic generator being inside said water tank , supply means to said water tank and outlet means from said water tank for smoke . the invention relates as well to a method to operate such a smoke simulator system for an aircraft simulator cockpit .