Skip to main content

Source: Flight 370's altitude dropped after sharp turn

By Sara Sidner, Catherine E. Shoichet and Evan Perez, CNN
March 24, 2014 -- Updated 0225 GMT (1025 HKT)
  • NEW: U.S. Navy sending listening device to help find voice and data recorders if wreckage is found
  • Source: Plane changed altitude, flying as low as 12,000 feet after making short turn
  • Schiavo: Altitude information "explains so many pieces that didn't fit together"
  • 10 aircraft set to comb southern region for missing plane as search resumes Monday

Kuala Lumpur, Malaysia (CNN) -- As a growing number of airplanes scoured the southern Indian Ocean in the search for Malaysia Airlines Flight 370, authorities released new details that paint a different picture of what may have happened in the plane's cockpit.

Military radar tracking shows that the aircraft changed altitude after making a sharp turn over the South China Sea as it headed toward the Strait of Malacca, a source close to the investigation into the missing flight told CNN. The plane flew as low as 12,000 feet at some point before it disappeared from radar, according to the source.

The sharp turn seemed to be intentional, the source said, because executing it would have taken the Boeing 777 two minutes -- a time period during which the pilot or co-pilot could have sent an emergency signal if there had been a fire or other emergency onboard.

Authorities say the plane didn't send any emergency signals, though some analysts say it's still unclear whether the pilots tried but weren't able to communicate because of a catastrophic failure.

The official, who is not authorized to speak to the media, told CNN that the area the plane flew in after the turn is a heavily trafficked air corridor and that flying at 12,000 feet would have kept the jet well out of the way of that traffic.

Earlier Sunday, Malaysian authorities said the last transmission from the missing aircraft's reporting system showed it heading to Beijing -- a revelation that appears to undercut the theory that someone reprogrammed the plane's flight path before the co-pilot signed off with air-traffic controllers for the last time.

That reduces, but doesn't rule out, suspicions about foul play in the cockpit.

The new details give more insight about what happened on the plane, but don't explain why the plane went missing or where it could be.

Analysts are divided about what the latest information could mean. Some argue it's a sign that mechanical failure sent the plane suddenly off course. Others say there are still too many unknowns to eliminate any possibilities.

CNN aviation analyst Miles O'Brien called the fresh details about the flight a "game changer."

A satellite image released by China shows an object in the southern Indian Ocean.  A satellite image released by China shows an object in the southern Indian Ocean.
A satellite image released by China shows an object in the southern Indian Ocean.A satellite image released by China shows an object in the southern Indian Ocean.
Flight MH370: What went wrong?
'Gonna have to go out there and look'

"Now we have no evidence the crew did anything wrong," he said. "And in fact, now, we should be operating with the primary assumption being that something bad happened to that plane shortly after they said good night."

If a crisis on board caused the plane to lose pressure, he said, pilots could have chosen to deliberately fly lower to save passengers onboard.

"You want to get down to 10,000 feet, because that is when you don't have to worry about pressurization. You have enough air in the atmosphere naturally to keep everybody alive," he said. "So part of the procedure for a rapid decompression ... it's called a high dive, and you go as quickly as you can down that to that altitude."

Military radar tracked the flight between 1:19 a.m. and 2:40 a.m. the day it went missing, the source told CNN, but it's not clear how long it took the plane to descend to 12,000 feet.

The new details about altitude are "highly significant," said Mary Schiavo, a CNN aviation analyst and former inspector general for the U.S. Department of Transportation.

"It explains so many pieces that didn't fit together before," she said. "Now, if we have a scenario where something happened, the plane made a dramatic turn and dropped from 35,000 feet to 12,000 feet, this scenario would fit what a pilot would do in the event of a catastrophic onboard event, such as a rapid decompression, a fire, an explosion. That's what you would have to do, descend, get down and turn around and try to get back to an airport that could accommodate an ailing plane."

If the latest information is accurate, the theory of pilots trying to save the plane fits, said Mark Weiss, a former American Airlines pilot and CNN aviation analyst.

But that's a big if, he said.

"We've had so much information come out and so much contradictory information come out, that I caution against jumping to any types of conclusions at this point," he said.

Challenging search

As speculation over what led to the flight's disappearance showed no signs of slowing, investigators appeared to be beefing up their efforts to comb the southern Indian Ocean.

Buoyed by a third set of satellite data that indicated possible debris from the plane in the water, the international team led by Australia fought bad weather as it looked for signs of the Boeing 777 and the 239 people who were aboard when the plane went missing on March 8.

The search for the missing Malaysia Airlines plane resumed Monday morning, with additional aircraft joining the operation, Australian authorities said. The Australian Maritime Safety Authority said 10 aircraft will search for possible objects in an area about 2,500 kilometers (1,550 miles) southwest of Perth.

That includes two jets from China and two from Japan, which were on the way to join the search area on Monday, authorities said.

France's Foreign Ministry said Sunday that radar data from a satellite pointed to floating debris in the Indian Ocean 2,300 kilometers (1,430 miles) from Perth, Australia. The data were immediately passed along to Malaysian authorities, and French satellite resources will home in more on the area, the ministry said.

Satellite images previously issued by Australian and Chinese authorities have also captured possible large floating objects, stoking hopes searchers may find debris from the missing plane.

But so far, searchers have turned up empty-handed after more than two weeks of scouring land and sea.

On Saturday, searchers found a wooden pallet as well as strapping belts, the Australian Maritime Safety Authority's John Young said. The use of wooden pallets is common in the airline industry.

"It's a possible lead ... but pallets are used in the shipping industry as well," he said Sunday. Authorities have said random debris is often found in the ocean.

The flying distance to and from the search area presents a big challenge for search aircraft.

A policewoman watches a couple whose son was on board the missing Malaysia Airlines Flight 370 cry outside the airline's office building in Beijing after officials refused to meet with them on Wednesday, June 11. The jet has been missing since March 8. A policewoman watches a couple whose son was on board the missing Malaysia Airlines Flight 370 cry outside the airline's office building in Beijing after officials refused to meet with them on Wednesday, June 11. The jet has been missing since March 8.
The search for Malaysia Airlines Flight 370
Photos: The search for Malaysia Airlines Flight 370 Photos: The search for Malaysia Airlines Flight 370
Will we ever find Flight 370?
Could this ocean robot help find missing plane?

"They're operating at the limits of their endurance," said Mike Barton, the authority's rescue coordination chief.

If search crews do turn up anything, they'll soon have more technology to help them.

The U.S. Navy is sending a super-sensitive hydrophone listening device to Australia to be on standby if debris from Malaysia Airlines Flight 370 is found and a search for the plane's voice and data recorders can be done, a U.S. military official said Sunday. The device is pulled behind a ship at slow speeds and is used by the Navy to locate downed aircraft to a depth of 20,000 feet.

Nothing but water, and questions

Was turn reprogrammed?

Malaysian officials, in a written update Sunday on the search, cast doubt on the theory that someone, perhaps a pilot, had reprogrammed the aircraft to make an unexpected left turn during the flight.

"The last ACARS transmission, sent at 1:07 a.m., showed nothing unusual. The 1:07 a.m. transmission showed a normal routing all the way to Beijing," it read.

The Aircraft Communications Addressing and Reporting System measures thousands of data points and sends the information via satellite to the airline, the engine manufacturer and other authorized parties, according to CNN aviation and airline correspondent Richard Quest.

Had the plane been reprogrammed to change course, the ACARS system should have reported it during its last communication at 1:07. The ACARS is supposed to report new information every 30 minutes, but it was silent at 1:37.

"It is important because it is more consistent (with an emergency). In other words, if the pilots had put in this waypoint that they were going to turn to and that they knew in advance of their last communication that they were going to turn, then everyone was (saying) that this had to be a premeditated act," Schiavo said. "Now if this information is correct, and it was not premeditated, then it does fit very closely with the scenario that, whatever happened, happened suddenly and they turned perhaps to go back to an emergency airport."

Hope, only hope

Australian Prime Minister Tony Abbott voiced hope that investigators could be closing in on an answer to questions that have dogged authorities for days: What happened to the plane, and where is it?

"We have now had a number of very credible leads, and there is increasing hope -- no more than hope, no more than hope -- that we might be on the road to discovering what did happen to this ill-fated aircraft," Abbott said at a news conference.

In one of the great aviation mysteries in history, the airliner carrying 239 people disappeared March 8 after it took off from Kuala Lumpur, Malaysia, on a flight to Beijing. An exhaustive search covering 2.97 million square miles -- nearly the size of the continental United States -- has yielded some clues but no evidence of where the Boeing 777 is or what happened to it.

Countries from central Asia to Australia are also engaged in the search along an arc drawn by authorities based on satellite pings received from the plane hours after it vanished.

One arc tracks the southern Indian Ocean zone that's the focus of current attention. The other arc tracks over parts of Cambodia, Laos, China and into Kazakhstan.

Whole world listens for slowly fading pings

Ocean search has many challenges

Clues lead to new theories

CNN's Sara Sidner reported from Kuala Lumpur. CNN's Evan Perez reported from Washington and CNN's Catherine E. Shoichet reported from Atlanta. CNN's Mitra Mobasherat, Ben Brumfield, Faith Karimi, Elizabeth Joseph and Barbara Starr contributed to this report.

Part of complete coverage on
June 26, 2014 -- Updated 2211 GMT (0611 HKT)
The search for MH370 is moving to an area farther south in the Indian Ocean, said the Australian Deputy Prime Minister.
June 25, 2014 -- Updated 0033 GMT (0833 HKT)
Erin Burnett speaks to Miles O'Brien about the latest in the search for Malaysia Airlines Flight 370.
June 18, 2014 -- Updated 1653 GMT (0053 HKT)
Ten experts say that the search for MH370 should move hundreds of miles away from the previous search area.
June 17, 2014 -- Updated 1322 GMT (2122 HKT)
His wife never came home from her flight on MH370, and now K.S. Narendran is left to imagine the worst of possible truths without knowing.
June 16, 2014 -- Updated 1951 GMT (0351 HKT)
Families are desperate for results as the search for MH370 reaches a grim milestone. Anna Coren reports from Beijing.
June 9, 2014 -- Updated 1455 GMT (2255 HKT)
Relatives of passengers are launching an effort to raise $5 million for investigations and a "whistle blower" reward.
June 9, 2014 -- Updated 0731 GMT (1531 HKT)
Making sure another plane is never "lost" again is the immediate priority for the airline industry.
May 30, 2014 -- Updated 1536 GMT (2336 HKT)
This handout photo taken on April 7, 2014 and released on April 9, 2014 by Australian Defence shows Maritime Warfare Officer, Sub Lieutenant Ryan Penrose watching HMAS Success as HMAS Perth approaches for a replenishment at sea while searching for missing Malaysia Airlines flight MH370 in the southern Indian Ocean. Two fresh signals have been picked up Australian ship Ocean Shield in the search for missing Malaysian flight MH370, raising hopes that wreckage will be found within days even as black box batteries start to expire.
Was the sound of Malaysian Airlines Flight MH370 striking the water captured by ocean devices used to listen for signs of nuclear blasts?
May 28, 2014 -- Updated 2229 GMT (0629 HKT)
What was believed to be the best hope of finding the missing plane is now being called a false hope. Rene Marsh explains.
May 28, 2014 -- Updated 2105 GMT (0505 HKT)
Involved parties, including the manufacturer Boeing, are bracing for a long public relations siege.
May 29, 2014 -- Updated 1134 GMT (1934 HKT)
Official: The four acoustic pings at the center of the search for Flight 370 are no longer believed to have come from the plane's black boxes.
May 27, 2014 -- Updated 1421 GMT (2221 HKT)
There is one fundamental question which continues to swirl: Has Inmarsat got its numbers right?
May 27, 2014 -- Updated 1213 GMT (2013 HKT)
Data from communications between satellites and missing Malaysian Airlines Flight 370 was released
May 27, 2014 -- Updated 0742 GMT (1542 HKT)
Family members of the people aboard missing plane want independent investigators to review the newly released satellite data.
May 21, 2014 -- Updated 1147 GMT (1947 HKT)
CNN's Richard Quest explains what kind of information should be contained in the Inmarsat data from Flight MH370.
May 27, 2014 -- Updated 0046 GMT (0846 HKT)
The underwater search for the missing Malaysia Airlines plane will effectively be put on hold this week, and may not resume until August at the earliest.
May 19, 2014 -- Updated 1304 GMT (2104 HKT)
Movie-makers in Cannes have announced they're making a thriller based on the disappearance of Malaysian flight MH370.
May 6, 2014 -- Updated 1925 GMT (0325 HKT)
The search for the missing Boeing 777 has gone on for eight weeks now. CNN's David Molko looks back at this difficult, emotional assignment.