An increasingly connected production in the sense of Industry 4.0 allows completely new possibilities in regard to improved and more efficient production and higher product quality. But a key factor to Industry 4.0 is a consistent data flow along the production chain. However, the exchange of data, especially between companies, still is a major obstacle to overcome in order to achieve the aforementioned advantages. Currently, there are increasing efforts to record and analyse data. But there is a lack of a holistic system to handle data, therefore commonly company databases or other inefficient methods are used. These solutions are limited with regard to data exchange since the ownership of data cannot be proven, production data has no unforgeable timestamp, which in turn hinders the generation of complete production history from the final product (e.g., car door) back to the semi-finished product (e.g., steel sheet). As a result, there is insufficient to no data exchange along the production chain. In order to solve these problems blockchain is a promising approach. At the Institute of Manufacturing Technology, an operational blockchain system was developed and implemented using standard production machines. With the combination of a quarto rolling mill and a 400t - press, representing the sheet metal supplier and a forming company, respectively, the typical process chain of sheet metal processing is represented, which allows the detailed investigation of the established blockchain in this field of application. Within this contribution, the conceptual approach of a blockchain system for forming technology will be presented. The nature and the classification of occurring data throughout the production chain will be addressed.

DLR is working on a Wake Encounter Advisory & Avoidance (WEAA) system to allow pilots to avoid potentially dangerous wake vortex encounters by a tactical evasion maneuver. Such maneuver is of small scale i.e. it tries to adhere to the planned flight track as closely as possible and is not intended to require ATC permission. The paper introduces system design and core functions of the WEAA system (meteorological data fusion, wake vortex prediction, trajectory prediction and conflict detection, hazard evaluation, avoidance trajectory generation, alerting and guidance) and briefly describes DLR's technical solutions. Initial results will be presented for the system implementation including first results from recent flight tests for on-board conflict detection employing DLR's Falcon 20E and A320 Advanced Technology Research Aircraft (ATRA). Nomenclature= coefficient of rolling moment induced by wake vortex C l max, δl = coefficient for maximum rolling moment obtainable by roll motivator deflection (roll control power) ∆H = vertical distance RCR = roll control ratio δ l = deflection of roll moment motivator (usually aileron and/or roll spoiler) σ = standard deviation a = horizontal extent of hazard area (relative to nearest vortex centre) b = vertical extent of hazard area (relative to nearest vortex centre) t * = normalised wake vortex age y * = normalised lateral wake vortex motion (distance travelled over initial wake vortex separation) ∆y = distance in spanwise direction I. MotivationHE encounter of sufficiently strong wake vortices of preceding or crossing aircraft can pose a substantial hazard to the follower as a consequence of • significant induced (linear and angular) accelerations leading to injuries of the aircraft's occupants or structural damages of the airframe, • induced forces and moments -often predominantly rolling moments -leading to a poorly controllable flight condition or even (temporary) loss of control, • hazardous flight path deviations resulting from the above effects, including altitude loss in the downdraft of the wake or as a consequence of the induced roll angle.Wake vortices are often encountered in departure and approach operations -even close to the threshold, which makes them particularly dangerous due to ground proximity -but encounters also regularly occur during cruise or in holding patterns. Separations as procedural means are applied under Instrument Flight Rules (IFR) to avoid