Tray adapted back up power supply for avionics equipment

摘要: The invention provides a back up power supply for avionics equipment that can be installed in existing trays without having to rewire the aircraft. According preferred embodiment of (described illustrative purposes context providing cockpit voice recorder (CVR)), supply/CVR combination is retrofit an CVR rack. modular; removable/replaceable; and “independent” relative main aircraft source wiring. modular designed fit into conventional tray; accept CVR. embodiment, “plug compatible” with electrical connector tray includes circuitry which allows both tested using test button cockpit; report faults from either unit automatically electrically disconnects it exposed pins when removed tray.