Shorter arrival time through improved Time and Energy Managed Operations


From 9-26 October the Netherlands Aerospace Centre (NLR) has successfully executed Clean Sky flight trials with the Cessna Citation II research aircraft. The trials consisted of several descents and approaches at the Eelde airport near Groningen, demonstrating the TEMO (Time and Energy Managed Operations) concept developed in the Clean Sky Joint Technology Initiative research programme as part of the Systems for Green Operations (SGO) Integrated Technology Demonstrator.

A TEMO descent aims to achieve an energy-managed idle-thrust continuous descent operation (CDO) while satisfying ATC time constraints, to maintain runway throughput. An optimal descent plan is calculated with an advanced on-board real-time aircraft trajectory optimisation algorithm considering forecasted weather and aircraft performance. The optimised descent plan was executed using the speed-on-elevator mode of an experimental Fly-By-Wire (FBW) system connected to the pitch servo motor of the Cessna Citation II aircraft. Several TEMO conceptual variants have been flown. It has been demonstrated that the TEMO concept enables arrival with timing errors below 10 seconds. The project was realised in cooperation with Delft University of Technology (TUD) and with the support of CONCORDE partners Universitat Polit├Ęcnica de Catalunya (UPC), PildoLabs and the Royal Netherlands Meteorological Institute (KNMI).

Experimental TEMO cockpit display on right side

NLR/TUD Cessna Citation II research aircraft