1965-02-01

Automatic Landing Systems Mechanization - Series or Parallel Servos? 650572

A review of several studies and their results, conducted in an effort to determine the most advantageous form of outer loop control mechanization for use in high-performance flight control systems, has indicated that the series servo concept has considerable merit in contrast to the similar parallel servo mechanization. Results of both analytical and hardware tests with pilot-in-the-loop evaluation in the area of system performance, failure transients, malfunction protection, and physical characteristics have shown that for all autopilot functions and particularly for such critical outer loop functions as automatic landing systems, the series servo system mechanization is superior or equivalent to the parallel servo in all respects.

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