Source: Malaysia Airlines plane sailed high quickly, then dropped

More Auvs may join look for Mh370

STORY HIGHLIGHTS

 NEW: sixth submerged automaton mission completes; seventh such outing is underway

 NEW: Agency: Up to 11 military planes, 12 boats to participate in Saturday seek

 Flight 370 is said to have strayed from flight arrangement while inside Vietnamese airspace

 There's still no indication of the Boeing 777, now 6 weeks after it make a go at missing

(CNN) - Malaysia Airlines Flight 370 radically changed course then sailed to close to its top height, a senior Malaysian avionics source said - adding yet an alternate wrinkle to the riddle of the plane's last flight .

When vanishing from radar screens on March 8, the business carrier strayed from its arranged course from Kuala Lumpur to Beijing by turning leftward over water while it was still inside Vietnamese airspace, the Malaysian aeronautics source told CNN's Nic Robertson.

The airplane then moved to 39,000 feet, only a tiny bit shy of the Boeing 777-200er's 41,000-foot safe working cutoff, and looked after that height for about 20 minutes over the Malaysian Peninsula before starting to drop, the source said.

Why? That thus much else - including where the plane is presently - remains a puzzle. Specialists have been striving for weeks to sort out bits of data attempting to get the responses being requested by relatives of the 239 individuals on board the plane, also millions all the more as far and wide as possible who have been dazzled by this trial.

Notwithstanding this recently uncovered advancement, examiners have confirmed that the missing plane was furnished with four crisis locator transmitters, or Elts, which are intended to transmit a plane's area to a crisis satellite when activated by an accident or by contact with water, the source included.

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Photographs: The quest for Malaysia Airlines Flight 370 Photos: The quest for Malaysia Airlines Flight 370

The Elts were at the plane's front entryway, its back entryway, in the fuselage and in the cockpit, said the source, who was thought about why they show up either not to have actuated or, in the event that they did initiate, why they were not grabbed by the satellite.

Relatives of the 239 travelers and team have raised inquiries regarding the Elts with Malaysian powers, recommending there were no less than three on board the plane, including two versatile units and one altered gadget.

No remark from Malaysia Airlines

Malaysia Airlines has declined to answer CNN's inquiries concerning the Elts and different matters relating to the flight, which vanished six weeks prior in the wake of taking off not long after 12 pm from Kuala Lumpur, Malaysia.

The aerial shuttle said it couldn't remark on "any inquiries that identify with data held by different powers and/or fall under the purview of the progressing examination. ..."

Also this test, the situation has prodded a far reaching, exorbitant pursuit to discover the airplane.

That incorporates the dispatching of up to 11 military air ship and 12 boats Saturday over three zones off Perth, Australia. They will blanket something like 20,000 square miles (50,000 square kilometers) and valiant confined showers, as stated by Australia's Joint Agency Coordination Center.

There may not be significantly a greater amount of this, on the other hand. Authorities have said seeks from air and boats are presumably nearing an end.

That doesn't shock previous U.s. National Transportation Safety Board Managing Director Peter Goelz, given the comes about in this way. "There's a great deal of assets being exhausted there; its turned up nothing," he said.

At the same time Goelz predicts the submerged period of the quest will proceed for the six to eight weeks required to blanket the flow hunt zone. In the event that that turns up nothing, he anticipated, towed cluster sonar presumably would be utilized to inquiry a more extensive zone.

"This is an exceptionally intricate operation," sea seek expert Rob Mccallum said. "It's going to be a session of understanding now."

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Starting early Saturday, the submerged automaton scouring the base of the Indian Ocean had taken six outings searching for the missing jetliner with a seventh mission then underway.

The Joint Agency Coordination Center said the Bluefin-21 pursuit has secured about 50 square miles. While the data shined from the sixth trek was all the while being dissected, the initial five didn't yield any leaps forward.

Malaysia's acting transport pastor, Hishammuddin Hussein tweeted Friday that powers are taking a gander at conveying more unmanned submerged tests.

Authorities should seriously think about seeking along a substantial segment of ocean highlighted by a halfway computerized "handshake" between the jetliner and an Inmarsat PLC satellite, said Martin Dolan, Australia's top transport official.

That bend of ocean is more than 370 miles in length and 30 miles wide.

A delayed undersea hunt by private builders could require a "ballpark harsh appraisal" of $234 million, said Dolan.

Travelers' family rundown questions

The proceeding pursuit exertions came as relatives of the individuals who were on board the jetliner pressed for replies.

They have drawn up 26 inquiries that they need tended to by Malaysian authorities, who are to meet with them one week from now in Beijing. A large portion of the Flight 370 travelers and team were Chinese.

Around their inquiries: What's in the flight's log book? Can they survey the plane's upkeep records? Can they listen to recordings of the Boeing 777 pilot's discussions with air activity controllers simply before contact was lost?

Hishammuddin has safeguarded his legislature's treatment of the operation and blamed parts for the news media o