Publication Abstracts

Strapp et al. 2016

Strapp, J.W., A. Korolev, T. Ratvasky, R. Potts, A. Protat, P. May, A. Ackerman, A. Fridlind, P. Minnis, J. Haggerty, J.T. Riley, L.E. Lilie, and G.A. Isaac, 2016: The High Ice Water Content Study of Deep Convective Clouds: Report on Science and Technical Plan. DOT/FAA/TC-14/31. Federal Aviation Administration.

This report describes a collaborative research project to collect atmospheric data to support engineering issues related to the failure of commercial aircraft jet engines in convective clouds and a variety of scientific issues related to the microphysical properties and structure of deep convective clouds. The aviation sector has compiled information on more than 100 weather-related engine power-loss events and concluded that they are due to flight through areas of high ice water content (HIWC) associated with deep convective clouds. Flight into high ice concentrations has also resulted in failures of air data probes, most notably aircraft pitot probes. As a result, an industry-led working group, the Engine Harmonization Working Group (EHWG), recommended the collection of an in situ data set to characterize the microphysical properties of these clouds, to be used to provide guidance to manufacturers and to substantiate the new Title 14 Code of Federal Regulations Part 33 Appendix D engine icing certification envelope for HIWC ice crystal conditions.

This report provides background information and recommendations on how to conduct flight test operations for these aviation objectives. The objectives of the data collection and the design of the flight experiment were determined during numerous meetings of the EHWG and are consistent with its technical plan. Measurements will focus on the characterization of HIWC regions and the provision of 99th percentile total water content statistics and ice crystal characteristic size as a function of distance scale. These measurements will provide the first extensive modern data set of in situ measurements of the updraft areas of tropical oceanic deep convection and stratiform regions of more vigorous tropical continental convection that can be safely penetrated and will be a unique resource for the industry and science communities. Data will be used by the science community to improve knowledge on basic cloud microphysical processes and numerical cloud modeling and to develop better algorithms for ground- and space-based remote sensors in active convective cells. In addition, the measurements will support the development of pilot's radar and nowcasting tools for the aviation sector to help in forecasting and avoidance of these hazardous cloud regions.

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BibTeX Citation

  author={Strapp, J. W. and Korolev, A. and Ratvasky, T. and Potts, R. and Protat, A. and May, P. and Ackerman, A. and Fridlind, A. and Minnis, P. and Haggerty, J. and Riley, J. T. and Lilie, L. E. and Isaac, G. A.},
  title={The High Ice Water Content Study of Deep Convective Clouds: Report on Science and Technical Plan},
  publisher={Federal Aviation Administration},

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RIS Citation

ID  - st01620b
AU  - Strapp, J. W.
AU  - Korolev, A.
AU  - Ratvasky, T.
AU  - Potts, R.
AU  - Protat, A.
AU  - May, P.
AU  - Ackerman, A.
AU  - Fridlind, A.
AU  - Minnis, P.
AU  - Haggerty, J.
AU  - Riley, J. T.
AU  - Lilie, L. E.
AU  - Isaac, G. A.
PY  - 2016
BT  - The High Ice Water Content Study of Deep Convective Clouds: Report on Science and Technical Plan
PB  - Federal Aviation Administration
ER  -

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