Accession Number:

ADB000284

Title:

Redundant Flight-Critical Control System Evaluation. Analog and Digital Systems Performance Comparison

Descriptive Note:

Final rept. on Phase 2, Task 4

Corporate Author:

BOEING COMMERCIAL AIRPLANE CO SEATTLE WA

Report Date:

1974-10-01

Pagination or Media Count:

278.0

Abstract:

The U.S. SST prototype commercial airliner under development from 1967 to 1971 employed redundant flight-critical control systems as an essential part of the airplanes airworthiness. The flight control system electronics were analog for the flight-critical stability augmentation functions and digital for the automatic flight control functions. The digital system, through an automated preflight test function, also served to establish the integrity of the flight- critical elements. The SST program was terminated before these systems became operational. This study deals with the mechanization of redundant electronic systems. Specifically, the study evaluates analog and digital electronic designs for implementing a triplex fail-operational flight-critical control system. The primary subjects studied were analog and digital systems multiple failure fail-operational capabilities and preflight integrity check requirements. This document deals with analytical and laboratory performance evaluations of the systems studied. Specific areas covered include basic filter processing, closed loop operation, fault tolerant performance, sensor signal selectionfailure detection, and digital computer timing and memory relationships.

Subject Categories:

  • Transport Aircraft
  • Air Navigation and Guidance

Distribution Statement:

APPROVED FOR PUBLIC RELEASE