ATM application-oriented Research for Aviation Green Deal

The SESAR 3 JU has identified the following innovative research elements that could be used to achieve the expected outcomes. The list is not intended to be prescriptive; proposals for work on areas other than those listed below are welcome, provided they include adequate background and justification to ensure clear traceability with the R&I needs set out in the SRIA for the aviation green deal flagship.

• Geometric altimetry. In current operations, aircraft cruising at a constant barometric pressure need to climb/descend when flying across isobars, which in the case of a climb causes extra fuel-burn. This extra fuel-burn may be offset if, thanks to it, the aircraft stays at its optimum (or at least closer to optimum) pressure altitude / temperature for a long enough time, but otherwise fuel may be wasted. The use of barometric altimetry has been the only option since the advent of aviation, but a move to geometric altimetry is deemed possible today because aircraft