Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Enhanced Autopilot System Could Help Prevent Accidents Like 2009 Air France 447 Crash

03.04.2014

Research by Rensselaer Polytechnic Institute Professor Carlos Varela Develops “Active Data” System

Thirty lines of computer code might have saved Air France flight 447, and 228 passengers and crew aboard, from plunging into the Atlantic Ocean on June 1, 2009, according to new research by Carlos Varela, an associate professor of computer science at Rensselaer Polytechnic Institute. Varela and his research group have developed a computer system that detects and corrects faulty airspeed readings, such as those that contributed to the AF447 crash. Their approach to detecting errors could be applicable in many systems that rely on sensor readings.


GNU Free Documentation License Copyright © 2007 David Monniaux

Pitot tube from an Airbus A380.

“During this flight, important sensors failed, and reported erroneous data. But the autopilot didn’t know that, and it acted as if the data were correct,” said Varela. “We have computers that can beat the best human Jeopardy! players, and yet we rely on these relatively weak autopilot systems to safeguard hundreds of people on each flight. Why don’t we add more intelligence to autopilot systems?”

Varela’s research, aimed at developing “active data,” was funded by the Air Force Office of Scientific Research under the Dynamic Data Driven Application Systems (DDDAS) program. The goal of the grant is to develop mathematical and programming elements that enable otherwise passive data systems to search for patterns and relationships, and discover knowledge in data streams. Varela, who is himself a pilot, recognized that robust “active data” systems could have prevented the crash of flight AF447. Shigeru Imai, a computer science graduate student, originally presented their research and results at the 2nd International Conference Big Data Science and Engineering in December 2013.

AF447 crashed into the Atlantic Ocean more than 400 miles off Brazil’s northeastern coast. When recovered, the “black box” flight recorders revealed a chain of events beginning with erroneous readings from the pitot tubes – instruments that use air pressure to calculate airspeed. The pitot tubes, presumably blocked by ice, reported a drop in airspeed from 461 to 182 knots. The autopilot, unaware of the error, lowered the nose of the airplane in an attempt to increase airspeed. Unable to maintain altitude, the autopilot disengaged, at which point three human pilots were not able to correct for the error.

Varela and his research group focused on failure of the airspeed sensors. In the event of a pitot tube failure, airspeed can be accurately calculated using groundspeed and wind speed data gathered from onboard instruments that monitor GPS satellites, and weather forecasting information obtained prior to the flight. The relationship between the three data streams provided the group with an opportunity.

“If we can capture the mathematical relationship between the data streams, we can look at the patterns that arise upon known failures, which we call ‘error signatures,’” Varela said. “Then we can say ‘oh, this anomaly in the data corresponds to a known hardware failure. We know what is happening.’”

The group created a programming language called the “ProgrammIng Language for spatiO-Temporal data Streaming applications,” or “PILOTS,” and used it to write a program that examines the three data streams and searches for an error signature. If a signature is detected, the system corrects the error using data from the other two streams. In test runs, the PILOTS program – which uses about 30 lines of high-level code to govern a constant analysis of the data – prevented the AF 447 crash.

“We put the data from the black box of this Air France flight in our model, and in five seconds we were able to detect that the pitot tubes had iced, and we were able to compute the correct airspeed,” said Varela. “During the actual flight, the pitot tubes were only iced for 40 seconds, but by the time they were functioning properly again, the plane was descending at about 10,000 feet per minute.”

Varela said the approach has many other applications. In the context of autopilot systems, Varela said active data could potentially prevent errors like those behind the 2005 crash of Tuninter Flight 1153, in which pilots trusted a faulty fuel indicator, and could aid pilots in situations like the 2009 controlled ditch of US Airways Flight 1549 into the Hudson River.

Varela said the concept could also be helpful in other applications that rely on sensors, such as healthcare, where sensors used to collect data from patients could detect early signs of seizures or heart attacks based on patterns in the data.

Mary Martialay | newswise

Further reports about: Atlantic Autopilot Crash Flight Ocean Polytechnic RPI errors failure lines programming tubes

More articles from Information Technology:

nachricht Timing a space laser with a NASA-style stopwatch
28.03.2017 | NASA/Goddard Space Flight Center

nachricht Cutting edge research for the industries of tomorrow – DFKI and NICT expand cooperation
21.03.2017 | Deutsches Forschungszentrum für Künstliche Intelligenz GmbH, DFKI

All articles from Information Technology >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A Challenging European Research Project to Develop New Tiny Microscopes

The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.

To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Researchers create artificial materials atom-by-atom

28.03.2017 | Physics and Astronomy

Researchers show p300 protein may suppress leukemia in MDS patients

28.03.2017 | Health and Medicine

Asian dust providing key nutrients for California's giant sequoias

28.03.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>