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Flight Tests Related to Jet-Transport Upset and Turbulent-Air PenetrationA flight program, utilizing a Convair 880 and a Boeing 720 airplane, was conducted in conjunction with wind-tunnel and simulator programs to study problems related to jet-transport upsets and operation in a turbulent environment. During the handling-qualities portion of the program the basic static stability of the airplanes was considered to be satisfactory and the lateral-directional damping was considered to be marginal without damper augmentation. An evaluation of the longitudinal control system indicated that this system can become marginal in effectiveness in the high Mach number and high dynamic-pressure range of the flight envelope. From the upset and recovery phase of the program it was apparent that retrimming the stabilizer and spoiler deployment were valuable tools in effecting a positive recovery; however, if these devices are to be used safely, it appears that a suitable g-meter should be provided in the cockpit because the high control forces in recovery tend to reduce the pilot's sensitivity to the actual acceleration loads. During the turbulence penetrations the pilot noted that the measured vibrations of 4 to 6 cps in the cockpit considerably disrupted their normal scan pattern and suggested that an improvement should be made in the seat cushion and restraint system. Also it was observed that the indicator needles on the flight instruments were quite stable in the turbulent environment.
Document ID
20000011982
Document Type
Conference Paper
Authors
Andrews, William H. (NASA Flight Research Center Edwards, CA United States)
Butchart, Stanley P. (NASA Flight Research Center Edwards, CA United States)
Sisk, Thomas R. (NASA Flight Research Center Edwards, CA United States)
Hughes, Donald L. (NASA Flight Research Center Edwards, CA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1965
Publication Information
Publication: NASA Conference on Aircraft Operating Problems: A Compilation of the Papers Presented
Subject Category
Aircraft Design, Testing and Performance
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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