Halloween weather has tricked, not treated, airport meteorologists the past two years in Denver. Heavy freezing drizzle--appearing to be harmless light drizzle--has cost airlines as much as $2 million in engine damage in a single storm as jets have waited for takeoff. Now Roy Rasmussen of the National Center for Atmospheric Research (NCAR) has developed a new system to identify the drizzle accurately. His research has enabled airlines to revise pilot training and on-ground procedures to avoid future damage. The new detection system will be installed this winter at Denver International Airport (DIA).
Rasmussen studied two cases of heavy freezing drizzle at DIA on October 31, 2002, and the same date in 2003. The two storms wreaked a total of $2.85 million in damage to 18 jet engines on United Airlines 737 aircraft. Trained meteorologists were on site throughout both events, but the freezing drizzle conditions were not accurately noted. In about half of all cases of freezing drizzle, the intensity is underreported, according to Rasmussen. "Freezing drizzle is hard to see and its intensity is hard to estimate visually," says Rasmussen. "Often it goes undetected because the droplets are so small." The typical droplet diameter is about half of a millimeter, or half the thickness of a compact disk.
Rasmussen has worked with United Airlines to alert pilots of 737 aircraft on the hazard, and the airline has changed its procedures as a result of his research. Formerly, if an airport meteorologist observed heavy freezing drizzle, engines were revved close to flying speed (called an engine run-up) every 30 minutes to throw off ice. "Now, if anyone says freezing drizzle, they do engine run-ups every ten minutes," says Rasmussen. "Airline people are sensitized to the possibility that freezing drizzle can cause engine damage."
Anatta | EurekAlert!
Putting food-safety detection in the hands of consumers
15.11.2018 | Massachusetts Institute of Technology
Next stop Morocco: EU partners test innovative space robotics technologies in the Sahara desert
09.11.2018 | Deutsches Forschungszentrum für Künstliche Intelligenz GmbH, DFKI
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
16.11.2018 | Health and Medicine
16.11.2018 | Life Sciences
16.11.2018 | Life Sciences