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Digital active control system for load alleviation for the Lockheed L-1011

Published online by Cambridge University Press:  04 July 2016

G. E. Bendixen ,
R. F. O'Connell  and
C. D. Siegert
G. E. Bendixen
Affiliation:
Rockwell International, Cedar Rapids
R. F. O'Connell
Affiliation:
Lockheed-California Company, Burbank
C. D. Siegert
Affiliation:
Lockheed-California Company, Burbank
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Extract

In the spring of 1980, a long range derivative of the L-1011 TriStar entered commercial airline service with an extended wing span and a digital Active Control System (ACS). The extended wing span improves fuel efficiency by 3 to 3½ % due to a higher wing aspect ratio and lower induced drag. The digital ACS provides load alleviation functions by symmetric motions of the outboard ailerons which relieve the loads induced by the increased wing span. This load relief minimises the amount of structural modifications required to the basic L-1011 wing to accommodate the increased wing span.

Type
Research Article
Information
The Aeronautical Journal , Volume 85 , Issue 849 , November 1981 , pp. 430 - 436
Copyright
Copyright © Royal Aeronautical Society 1991 

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References

1. Hoblit, F. M. Effect of yaw damper on lateral gust loads in design of the L-1011 transport. Presented at 37th meeting of the AGARD Structures and Materials Panel, The Hague, Netherlands, 7th-12th October 1973.Google Scholar
2. Lockhéed, , Volume 1 — Load alleviation/extended span development and flight tests, LR 29003-1, June 1979, to be issued as a NASA Contractor Report under Contract NASA1-14690.Google Scholar
3. Foss, R. L., and Lewolt, J. G., Use of active controls for fuel conservation of commercial transports, AIAA Paper No 77-1220, August 1977.Google Scholar
4. Hoblit, F. M., Paul, N.. Shelton, J. D. and Ashford, F. E., Development of a power-spectral gust design procedure for civil aircraft, FAA-ADS-53, January 1966.Google Scholar
5. Lewolt, J. G. and Ramsey, J. D. Design manoeuver loads for an airplane with an active control system. Presented at AIAA/ ASME/ASCE/AHS 20th Structures, Structural Dynamics and Materials Conference, St Louis, Missouri, 4th-6th April 1979.Google Scholar