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 Geplaatst: 10-11-2018 10:22:18 |
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Geregistreerd op: 24 Mei 2018
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WASHINGTON Doug Baldwin Hoodie , March 13 (Xinhua) -- Messages sent by a maintenance alert system cannot provide the "physical location" of a missing plane but indicate whether there are system or engine failures, a U.S. expert said Thursday.
The Wall Street Journal reported earlier in the day that the communication system of the missing Malaysia Airlines plane, a Boeing 777 with 239 people on board, continued to "ping" a satellite for a number of hours after the plane disappeared off radar early Saturday.
The signal came from the jet's "airplane health management system," or Aircraft Communication Addressing and Reporting System (ACARS), which provides a flow of data on the airliner's operations, said the report.
The newspaper later retracted one detail in its original report Earl Thomas III Hoodie , which had incorrectly stated that U.S. investigators were looking at data automatically downloaded and sent to the ground from the plane's Rolls-Royce Trent engines.
"I've heard conflicting versions of exactly what the WSJ was reporting. That may have been the ADS-B system, Automatic Dependent Surveillance-Broadcast system, which sends a signal twice per second broadcasting the aircraft position and altitude," Bill Waldock, an expert on aviation accident investigation from U.S.-based Embry-Riddle Aeronautical University, told Xinhua.
"It's a newer airplane-based GPS system that air traffic control uses near land in addition to the radar transponders to track the airplane," Waldock said.
If the ADS-B was still working properly 12th Fan Hoodie , air traffic control should have been able to track the aircraft within 150 to 200 miles (240 to 320 km) of land, he said.
"The ACARS system should't be sending location or speedaltitude data unless someone was entering them manually," Waldock said, adding that its primary use is as a maintenance planning tool for the airline.
"The automatic feature periodically transmits 'bursts' of condensed system condition and function data," said the expert.
He said that before Air France Flight 447 crashed into the Atlantic on June 1, 2009, the French airline's maintenance headquarters received four bursts of such data.
"These indicated multiple system failures and the last indicated a loss of pressurization. The main problem is that the data in a single burst isn't time-sequenced Michael Dickson Hoodie , so it is difficult to determine the order in which they occurred," Waldock said.
He said it is also possible for the pilots to send short messages through the system using a manual console in the cockpit.
Asked whether all airlines are equipped with the system, he said ACARS is operated by an independent organization as an add-on cost to the airline.
"Most modern airliners have the system in various configurations," he said.
If you are looking for a very special adventure and a different way to enjoy your vacation, cruising the Adriatic in Croatia in restored antique ships is for you.
The closest thing to this experience is being on the Windjammer in Maine, USA. But, instead of sailing on the rough Atlantic Ocean Shaquem Griffin Hoodie , you are sailing on the calm blue waters of the beautiful Adriatic Sea.
Dalmatia has a very mild climate. Winters are short and mild, and summers are long and hot. Due to Dalmatia geographical position there are often very pleasant winds. On average, every other day in Dalmatia is sunny and bright. All of these characteristics make Dalmatian climate one of the most desirable on our planet and cruising in Dalmatia the most popular vacation choice.
For this experience, you have to be fit, agile, adaptable, and enjoy meeting people from all over Europe. These ships have tall sails Russell Wilson Hoodie , but mostly run with motors as the wind is seldom and unpredictable. The capacity of these small ships is for a mere twenty eight or so people. The cabins are basic and small and not sound proof, reachable by narrow steep stairs. Some ships have private bathrooms for each cabin, while others are shared.
These adventures are for vacationers who love to swim, sunbathe, and snorkel, which can be done right off the ship as it anchors in beautiful spots. If you like camping, don?t require much privacy Frank Clark Shirt , and are comfortable with informal living, than you are a good candidate for this holiday adventure. Each evening your ship docks at either islands or the mainland, to enable you to socialize and enjoy local food and shops before returning to the ship for the night.
No need or space for a fancy wardrobe or many suitcases. This is a trip for tee shirts, swim suits, a few towels with lots of sun lotion in a small suitcase.
Each ship has its own chef who prepares home cooked meals with local produce, meat and fish daily in the informal dining area. Passengers share meals as they get to chat, make new friends Jarran Reed Shirt , and learn about Croatia as they sail.
Cruising in Croatia, chartering one of the many comfortable gullets is your holiday option where you can decide where and how to spend your time. Hopping from one to another island, visiting secluded coves and small fishing villages and admiring the natural splendor of the Adriatic coast.
Cruising is a great way to take a vacation. Chartering a gullet gives you the freedom, a cruise liner or a hotel cannot offer you. There are no fixed itineraries, so you are free to go where and when you please, visiting ancient sites and ruins, swimming in clear water and isolated caves Germain Ifedi Shirt , dressing as you like and eating what you imagine.
The crew is on your service, just for you. Have as much fun or tranquillity as you want and when you want it. Thousand islands, set in the blue Adriatic, fine Croatian cuisine ? all this can be found right in the heart of Europe! Croatia has long been the best kept secret of European sailors.
There is no better way to know Croatia but sailing to discover the country with a thousands and more islands.. Wholesale Custom Jerseys Wholesale NHL Jerseys Wholesale NFL Jerseys Online Wholesale NCAA Jerseys From China Wholesale NBA Basketball Jerseys Cheap Jerseys From China Cheap Nike NFL Jerseys Cheap Jerseys From China Cheap Adidas NHL Jerseys Cheap Nike NBA Jerseys |
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