1
Michael Ratchford, Richard E Versailles, Edward R Brown: Solid-state flight data recording system. United Technologies Corporation, Dominic J Chiantera, February 24, 1987: US04646241 (79 worldwide citation)

Flight parameter data is real time sampled in successive sample frames and temporarily stored in memory for one or more sample frame intervals, the stored sample values are examined to detect extremes in parameter values with time, periodic ones of the temporarily stored sample frames are permanentl ...


2
Michael Ratchford: Digital flight data recording system. United Technologies Corporation, Dominic J Chiantera, September 4, 1984: US04470116 (51 worldwide citation)

A flight data recording system includes a digital flight data recorder (DFDR) and a digital flight data acquisition unit (DFDAU) having a signal processor and nonvolatile memory for storing signals representative of a deterministic flight mode algorithm which defines a generic aircraft flight profil ...


3
Michael Ratchford, Richard L Bue, Alexander Charov: Fault tolerant communications interface. United Technologies Corporation, Dominic J Chiantera, December 30, 1986: US04633473 (21 worldwide citation)

A communications interface exchanges serial bit signals between sources differentially, over redundant, two conductor, primary and secondary channels. The primary channel provides the communications link during normal operation, and is monitored to ensure differential operation. In response to prima ...