Flight Characteristics of Iced Aircraft

Deiler, Christoph

doi:10.2514/6.2019-0560

Cited by 4 publications

(6 citation statements)

References 27 publications

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“…These results are similar to pilots' reports after the campaign: no significant change in relevant aircraft dynamics and handling qualities to safely operate the aircraft were noticeable during the flight. Nevertheless, note that there is a change in dynamics comparable to results given [25], but with the restrictions existing for the test flights (maintaining at low angles of attack and large safety margins) without any significant influence on the operation.…”

Section: System-identification Resultssupporting

confidence: 61%

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Facing the Challenges of Supercooled Large Droplet Icing: Results of a Flight Test Based Joint DLR-Embraer Research Project

Deiler¹,

Ohme²,

Raab³

et al. 2019

SAE Int. J. Adv. & Curr. Prac. in Mobility

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T oday's airplanes are well equipped to cope with most common icing conditions. However, some atmospheric conditions consisting of supercooled large droplets (SLD) have been identified as cause of severe accidents over the last decades as existing countermeasures even on modern aircraft are not necessarily effective against SLD-ice. In 2014, the new Appendix O to the certification regulations (FAR Part 25 / CS-25) had been issued to guarantee the safe operation of future airplane when encountering SLD conditions. But as the SLD topic is quite new for the majority of aircraft manufacturers and research institutes in a same way, DLR (German Aerospace Center) and Embraer established a joint research cooperation in 2012 to obtain a better understanding of the distinct influences of SLD-ice shapes on aircraft characteristics and to evaluate proper ways for future airplane certification under App. O. Furthermore, one additional scientific goal of the cooperation was to develop and test new tools for the in-flight monitoring of aircraft characteristics as well as the on-board identification of simulation models. During the 4 years of the project, a distinct way to better understand icing-induced degradations on a specific aircraft was followed: first, data of the clean aircraft was gathered in flight test to identify a dynamic simulation model as base for the subsequent evaluations. Second, data of test flights with artificial App. C ice configurations were analyzed and used for the development of distinct modifications of the base aircraft simulation model; a first evaluation of the icing-induced changes of aircraft characteristics was conducted. Third, after the generation of SLD-ice shapes, wind tunnel testing and flight clearance, a second flight test campaign with these artificial SLD-ice shapes delivered the data for an additional model modification and identification. The results of the final data and model evaluation provide the observable degradation of SLD-ice in flight, which is well comparable to results obtained from the App. C ice configurations.

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Section: System-identification Resultssupporting

confidence: 61%

“…A more detailed description of this evaluation is given in Ref. 25. Moreover, during the corresponding flight test no significant changes of aircraft controllability and dynamic characteristics (except changes related to the drag increase) were noticeable for the pilots.…”

Section: Figure 7 Limitedmentioning

confidence: 99%

Facing the Challenges of Supercooled Large Droplet Icing: Results of a Flight Test Based Joint DLR-Embraer Research Project

Deiler¹,

Ohme²,

Raab³

et al. 2019

SAE Int. J. Adv. & Curr. Prac. in Mobility

Self Cite

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“…C cases (see also Refs. [31,32]). The rolling mode root moves away from the origin due to a higher aerodynamic damping for the App.…”

Section: Evaluation Of Dynamic Modesmentioning

confidence: 99%

“…The App. C configurations (run-back and leading-edge ice) do not show a significant deterioration of the short period dynamics [13, 31, 32] whereas the SLD-ice configurations reveal a slightly different behaviour. The SLD-ice configurations show a change of pitching characteristics compared to the classical App.…”

Section: Changes In Flight Dynamicsmentioning

confidence: 99%

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Flight Characteristics with Different Supercooled Large Droplet Ice Configurations

Deiler¹

2021

Aeronaut. j.

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An evaluation of the effects of different ice configurations on the flight characteristics of a fixed-wing aircraft is presented. Within a joint research project of German Aerospace Center (DLR) and Brazilian aircraft manufacturer Embraer simulation models of three supercooled large droplet (SLD) ice configurations were developed for one Phenom 300 prototype. A specific flight test campaign with artificial SLD ice shapes on the aircraft was conducted to gather the relevant flight data. The simulation models for the different ice configuration were obtained by system identification, and specific results for the SLD-ice simulation models are provided. The analysis of aircraft characteristics was based on the results of these high-quality simulation models: the icing-induced changes of the flight performance characteristics evaluated by the interpretation of several parameters like thrust-to-weight ratio and specific excess power. The typical flight performance degradation was found for all ice configurations with different magnitude. The change of aircraft eigenmodes was investigated in detail by analysing the system matrix of the linearised models at a specific trim points. In addition, the diverse effects found for different ice configurations (App. C and SLD) are discussed and the change of root locus is analysed. Furthermore, ice-induced changes of the handling qualities are evaluated using numerical criteria of flying qualities standard “MIL-STD-1797 A”: no significant deterioration was found for the investigated ice configurations.

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An intelligent approach for flight risk prediction under icing conditions

Wang

Pei

2023

Chinese Journal of Aeronautics

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Flight Characteristics of Iced Aircraft

Cited by 4 publications

References 27 publications

Facing the Challenges of Supercooled Large Droplet Icing: Results of a Flight Test Based Joint DLR-Embraer Research Project

Facing the Challenges of Supercooled Large Droplet Icing: Results of a Flight Test Based Joint DLR-Embraer Research Project

Flight Characteristics with Different Supercooled Large Droplet Ice Configurations

An intelligent approach for flight risk prediction under icing conditions

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