Abstract: An avionics unit assembly for an aircraft can include an avionics unit (e.g., an underwater locator device, “ULD”), and a battery to power the avionics unit. The avionics unit assembly can further include a housing that encases the avionics unit and the battery. The housing includes a vent port for exhausting an emission from the housing during a failure of the avionics unit. The avionics unit assembly can further include one or more of a suppressor that filters the emission, a shield element that is resistant to chemical and/or thermal effects of the emission, and a bracket for mounting the avionics unit to a surface. A method integrating the avionics unit assembly onto a forward aircraft bulkhead at a mount location under an aircraft radome and for manufacturing the avionics unit, and an aircraft including the avionics unit are also described.

Abstract: Apparatus for locally coding image information and then controlling the delivery of voltage pulses based thereon to the print electrodes of a matrix printer for multicolored image reproduction is described. Control of the print electrode pulses is based on both pulse amplitude and pulse width variations. This concurrent control capability facilitates multicolor printing using a dye matrix that has interleaved dyes which are alternately amplitude and duration sensitive.The control apparatus, which includes a stacked memory, reads the local image data, which defines a set of pulse profiles for the particular dye matrix used, into the memory. Thereafter, this information is incrementally retrieved by appropriate means and delivered simultaneously to all of the printer's electrodes before any recording medium registration problem becomes discernible. After all memory information is printed, it is reloaded and the new image information is printed.