Formally Bounding UAS Behavior to Concept of Operation with Operation-Specific Scenario Description Language

Previous work introduced an approach for formally describing the concept of operations for unmanned aircraft. For this purpose, an existing language for simulation scenario description was adapted. In the context of the specific operation category, an upcoming European regulation for the operation of unmanned aircraft, the description and acceptance of the concept of operations plays a major role for flight approval on a per mission basis. This paper extends the previous approach further with combining the formalized description of the concept of operations with our existing approach for runtime monitoring. Monitoring the behavior at runtime can be used to enforce certain limits on the behavior. Therefore, the concept of operations is an ideal input for the monitoring approach. As a basis for the information relevant for the concept of operations the official annex to the guidelines document for the specific operation risk assessment is used, as well as an internal concept of operations document for a DLR research unmanned aircraft system

Sailplanes and powered sailplanes

Change no. 5SIGLEAvailable from British Library Document Supply Centre-DSC:4672.2503V(JAR 22) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Approved maintenance organisations

SIGLEAvailable from British Library Document Supply Centre- DSC:4672.2503(JAA-JAR--145) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Using SHERPA to predict design-induced error on the flight deck.

Human factors certification criteria are being developed for large civil aircraft. The objective is to reduce the incidence of design induced error on the flight deck. Many formal error identification techniques currently exist, however none of these have been validated for their use in an aviation context. This paper evaluates SHERPA (Systematic Human Error Reduction and Prediction Approach) as a means for predicting design induced pilot error. Since SHERPA was developed for predicting human error in the petrochemical and nuclear industries, a series of validation studies have suggested that it is amongst the best human error prediction tools available. This study provides some evidence for the reliability and validity of SHERPA in a flight deck context and concludes that it may form the basis for a successful human error identification tool

Analysis of Automatic Control Function Effects on Vertical Tail Plane Critical Load Conditions

This paper presents a modelling scheme suitable for loads analysis of maneuvers and gusts of flexible aircraft with active control systems. In contrast to most ongoing research the component to be investigated is not the wing but the vertical tail plane (VTP). Critical load conditions for vertical tail plane include yawing maneuver conditions as well as discrete lateral gusts. A new rudder reversal load condition features a three full reversals of the rudder pedal input instead of just one step input and a mere return to neutral. This condition, where resulting loads are considered ultimate, was mainly motivated by wake vortex encounters during which the pilots made excessive use of the rudder. The design loads resulting from all conditions are heavily influenced by the flight control system, the underlying control law design method, and associated control law parameters. This gives rise to interesting trade-offs between handling qualities and loads sizing the VTP structure. Therefore, in this paper the influence of different types of lateral control laws on the loads of the different gust and maneuver conditions for certification as specified by the authorities is analyzed. The control laws considered vary from basic yaw damping with rudder travel limitation to full roll and yaw command augmentation systems. From a design methodology point of view, classical and (incremental) Nonlinear Dynamic Inversion-based methods are analyzed

Meteorological influences on the design of advanced aircraft approach procedures for reduced environmental impacts

There is increasing interest in the development of aircraft operating procedures that reduce the environmental AQ1 impacts of commercial aviation through minimization of fuel burn, emissions and noise impacts. Meteorological factors can have a major influence on the behaviour of aircraft in different phases of flight, thus they must be carefully considered in the development of any new procedures. In this paper the most important of these factors are considered (wind profiles and local pressure variations) within the context of development of advanced approach procedures at a major UK airport. Models of the wind characteristics were developed for the region around the airport using data collected from the Natural Environment Research Council Mesosphere-Stratosphere-Troposphere Radar at Aberystwyth and surface wind measurements made at the airport, while an analysis of local pressure effects were based on readings taken at the airport. These models were used in a Monte Carlo flight simulator to determine the suitability of different approach procedure design in terms of flight and environmental performance. Flight tests of the final procedure design were conducted at the airport with a variety of commercial aircraft types and demonstrated the suitability of the procedures (and hence validated the modelling strategies used) and that significant environmental benefits in terms of reduced noise, fuel burn and emissions were achieved compared to existing procedures