NTRS - NASA Technical Reports Server

Back to Results
Evaluation of two cockpit display concepts for civil tiltrotor instrument operations on steep approachesA piloted simulation experiment was conducted using the NASA Ames Research Center Vertical Motion Simulator to evaluate two cockpit display formats designed for manual control on steep instrument approaches for a civil transport tiltrotor aircraft. The first display included a four-cue (pitch, roll, power lever position, and nacelle angle movement prompt) flight director. The second display format provided instantaneous flight path angle information together with other symbols for terminal area guidance. Pilots evaluated these display formats for an instrument approach task which required a level flight conversion from airplane-mode flight to helicopter-mode flight while decelerating to the nominal approach airspeed. Pilots tracked glide slopes of 6, 9, 15 and 25 degrees, terminating in a hover for a vertical landing on a 150 feet square vertipad. Approaches were conducted with low visibility and ceilings and with crosswinds and turbulence, with all aircraft systems functioning normally and were carried through to a landing. Desired approach and tracking performance was achieved with generally satisfactory handling qualities using either display format on glide slopes up through 15 degrees. Evaluations with both display formats for a 25 degree glide slope revealed serious problems with glide slope tracking at low airspeeds in crosswinds and the loss of the intended landing spot from the cockpit field of view.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Decker, William A.
(NASA Ames Research Center Moffett Field, CA, United States)
Bray, Richard S.
(NASA Ames Research Center Moffett Field, CA, United States)
Simmons, Rickey C.
(NASA Ames Research Center Moffett Field, CA, United States)
Tucker, George E.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1993
Publication Information
Publication: Piloting Vertical Flight Aircraft: A Conference on Flying Qualities and Human Factors
Subject Category
Aircraft Instrumentation
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
No Preview Available