Electronics and Flight Safety: A discussion of the Plessey philosophy of the use of data acquisition systems and a description of their range of systems

THE in‐flight recording of parameters relating to: altitude, heading, vertical acceleration, indicated air speed and pitch attitude, and their subsequent analyses by ground replay equipment, has been established for some years. The recording of this data was made mandatory by the regulatory authorities so that post‐incident analysis would reveal, with accuracy, the causes of an accident.