u2019 the seal off the edge of the panes the second is vibration caused by engines and flight loads during normal operation of the aircraft vibration causes the window panes seal and surrounding structure to vibrate at their respective resonant frequencies over long periods of time with the shape and mounting method of modern passenger windows this resonance can directly result in movement of the seal on the edge of the window the third is external hydrodynamic forces impinging upon the seal at the edge of the window the main source of which can be from pressure washers that may be used to clean the aircraft exterior or de icing fluids applied during the winter season this invention includes features designed into components of the window assembly that act together to prevent seal movement caused by for example the external influences previously described as illustrated in fig2 window assembly 200 in accordance with an embodiment of the present invention includes an outer pane 202 an inner pane 204 and window seal assembly 206 window seal assembly 206 further includes a seal 208 an integral stiffening ring 210 and a clamping ring 212 the remaining components of window assembly 200 may include all the components necessary to mount window panes 202 and 204 and seal assembly 206 to an aircraft for example window frame 214 and window retention clip 216 all of which are known to those of ordinary skill in the art window assembly 200 includes features designed into components of window assembly 200 in accordance with embodiments of the present invention the features rely upon mechanical engineering.