Propulsion Aspects of the Thrust Asymmetry Compensation System (TAC) on the Boeing 777 Airplane PUBLIC ACCESS

[+] Author Affiliations
Grace Balut Ostrom

The Boeing Company, Seattle, WA

Paper No. 98-GT-457, pp. V005T15A033; 7 pages
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7866-8
  • Copyright © 1998 by ASME


The Boeing 777 airplane has been designed with a Thrust Asymmetry Compensation System (TAC). This system reduces flight crew workload during single-engine flight operation by automatically commanding rudder deflection to compensate for different levels of thrust between the left and right engines. The airplane is equipped with two Engine Data Interface Units (EDIU) which compute thrust based on engine parameters. This paper will describe the thrust calculation, the fault detection requirements and the resultant fault monitors, and the processes used to validate the EDIU logic.

Copyright © 1998 by ASME
Topics: Thrust , Propulsion , Aircraft
This article is only available in the PDF format.



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