The present invention is directed to phosphonic acid compounds useful as serine protease inhibitors, compositions thereof and methods for treating inflammatory and serine protease mediated disorders. For example, in situations where the broadcast is recorded, playback may be enabled even after the trigger expiration. The housing is configured to receive solid CO2 through the inlet. The landing gear can also comprise at least one inclined front strut connected, on its lower end, to said leg and connected, on its upper end, to the structure of the fuselage thru connecting means.