An Interest In:
Web News this Week
- April 1, 2024
- March 31, 2024
- March 30, 2024
- March 29, 2024
- March 28, 2024
- March 27, 2024
- March 26, 2024
Some of Our Sources
- Techcrunch
- Technology Review
- Pearsonified
- Inspiredology
- Crazy Leaf Design
- Spyre Studios
- Freelance Switch
- Design Modo
- Willems Lab
- Hashedout
Help Webnuz
Referal links:
April 2, 2020 10:10 pm
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/GSJJTuO4hso/boeing-787s-must-be-turned-off-and-on-every-51-days-to-prevent-misleading-data-being-shown
Boeing 787s Must Be Turned Off and On Every 51 Days To Prevent 'Misleading Data' Being Shown To Pilots
The U.S. Federal Aviation Administration has ordered Boeing 787 operators to switch their aircraft off and on every 51 days to prevent what it called "several potentially catastrophic failure scenarios" -- including the crashing of onboard network switches. The Register reports: The airworthiness directive, due to be enforced from later this month, orders airlines to power-cycle their B787s before the aircraft reaches the specified days of continuous power-on operation. The power cycling is needed to prevent stale data from populating the aircraft's systems, a problem that has occurred on different 787 systems in the past. According to the directive itself, if the aircraft is powered on for more than 51 days this can lead to "display of misleading data" to the pilots, with that data including airspeed, attitude, altitude and engine operating indications. On top of all that, the stall warning horn and overspeed horn also stop working. This alarming-sounding situation comes about because, for reasons the directive did not go into, the 787's common core system (CCS) -- a Wind River VxWorks realtime OS product, at heart -- stops filtering out stale data from key flight control displays. That stale data-monitoring function going down in turn "could lead to undetected or unannunciated loss of common data network (CDN) message age validation, combined with a CDN switch failure." Solving the problem is simple: power the aircraft down completely before reaching 51 days. It is usual for commercial airliners to spend weeks or more continuously powered on as crews change at airports, or ground power is plugged in overnight while cleaners and maintainers do their thing.Read more of this story at Slashdot.
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/GSJJTuO4hso/boeing-787s-must-be-turned-off-and-on-every-51-days-to-prevent-misleading-data-being-shown
Share this article:
Tweet
View Full Article
Slashdot
Slashdot was originally created in September of 1997 by Rob "CmdrTaco" Malda. Today it is owned by Geeknet, Inc..More About this Source Visit Slashdot