GLTRS--Glenn
TITLE AND SUBTITLE:
Investigation of Dynamic Flight Maneuvers With an Iced Tailplane

AUTHOR(S):
Judith Foss Van Zante and Thomas P. Ratvasky

REPORT DATE:
January 1999

FUNDING NUMBERS:
WU-548-20-23-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-11470

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-1999-208849
AIAA-99-0371

SUPPLEMENTARY NOTES:
Prepared for the 37th Aerospace Sciences Meeting & Exhibit sponsored by the American Institute of Aeronautics and Astronautics, Reno, Nevada, January 11-14, 1999. Judith Foss Van Zante, Dynacs Engineering Co., Inc., 2001 Aerospace Parkway, Brook Park, Ohio 44142 (work funded by NASA Contract NAS3-9808) and Thomas P. Ratvasky, NASA Lewis Research Center. Responsible person, Judith Foss Van Zante, organization code 5840, (216) 433-3587.

ABSTRACT:
A detailed analysis of two of the dynamic maneuvers, the pushover and elevator doublet, from the NASA/FAA Tailplane Icing Program are discussed. For this series of flight tests, artificial ice shapes were attached to the leading edge of the horizontal stabilizer of the NASA Lewis Research Center icing aircraft, a DHC-6 Twin Otter. The purpose of these tests was to learn more about ice-contaminated tailplane stall (ICTS), the known cause of 16 accidents resulting in 139 fatalities. The pushover has been employed by the FAA, JAA and Transport Canada for tailplane icing certification. This research analyzes the pushover and reports on the maneuver performance degradation due to ice shape severity and flap deflection. A repeatability analysis suggests tolerances for meeting the required targets of the maneuver. A second maneuver, the elevator doublet, is also studied.

SUBJECT TERMS:
Aircraft icing; Tailplane icing; Tailplane performance; Maneuver evaluation

NUMBER OF PAGES:
16

PDF AVAILABLE FROM URL:
1999/TM-1999-208849.pdf
(639,574 KB)
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