Pilot workload assessment method in a new CNS/ATM environment

This paper discusses a pilot workload assessment and analysis method used in the development of NOCTARN (new operational concept using three dimensional adaptable route navigation), a concept based on three-dimensional flight trajectories shared between aircraft and air traffic control (ATC) via digital data link and negotiated using controller pilot data link communication (CPDLC). The method, named NAL-WLI, is a subjective mental workload assessment technique based on a modified NASA-TLX (task load index) that focuses on enabling the identification of factors contributing to workload and providing feedback to the NOCTARN environment system design using a scoring method that is easy for pilots. To validate the NAL-WLI method and identify factors contributing to workload in NOCTARN operations, the method was applied to piloted flight experiments using a research airplane and helicopter. Results from NAL-WLI identified factors contributing to workload and the causes of individual differences and provided information for improving the NOCTARN system design.