The ongoing investigation is focused on Boeing's anti-stalling system, also known as the "MCAS" (Maneuvering Characteristics Augmentation System), which the company uses in its 737 MAX series planes.
The FAA was among the last civil aviation authorities to ground the planes after the crash in Ethiopia earlier this month, with agency officials saying they lacked the data needed to act.
The aviation giant, which has been under fire and its flagship narrow-body planes grounded since March 13, tested the system upgrade on Monday, two days after pilots from American Airlines did simulation flights in Renton, Washington, the sources said.
This must all be done extremely quickly otherwise attempts to resolve the problem might be too late. In the Lion Air crash, pilots used the thumb switch more than two dozen times to try to override the system. The only people on board were the pilot and co-pilot.
In the over 1,600-page flight manual of Boeing's 737 Max 8 planes, the aircraft's new MCAS computer system, now at the centre of the investigations into two deadly crashes, is mentioned only once by name - in the glossary of abbreviated terms. He said the pilots followed protocol and there were no injuries. However, that still might not be enough time for crew members unfamiliar with the nuances of the system. It said the crew declared an emergency due to a reported engine problem on takeoff.
The 737 MAX crisis might cost Boeing billions of dollars in terms of compensation to air carriers. The spokesman added that Boeing had reinforced those procedures in a bulletin to pilots after the Lion Air crash.
Ethiopian Airlines is a symbol of enormous national pride for the country of more than 100 million people.
Boeing 737 Max jet makes emergency landing in Florida
Meanwhile, pilots for Fort Worth-based American and Dallas-based southwest met with Boeing in Washington state over the weekend. The plane was headed to Victorville, California for repositioning but returned safely to Orlando at about 2:50 p.m. (1850 GMT).
Get push notifications with news, features and more. Safety experts are also examining if pilots around the world were trained about the system.
Aviation safety consultant and a former 737 pilot, John Cox, told the Times that although pilots would likely trigger the first switch to extend the 40-second window, this would only buy several more minutes.
He wouldn't discuss Saturday's simulator testing but said the union is pleased that Boeing and the FAA are taking input from pilots in testing the fix.
Boeing's software update would require the system to rely on two sensors, rather than just one, and would not be triggered if the sensors disagreed by a certain amount, according to the three people.
One runway at OIA is closed while officials conduct an inspection.
On Tuesday, U.S. House Transportation Committee Chairman Peter DeFazio, D-Oregon, urged the FAA to have an independent third party review software changes that Boeing is making on the Max to ensure it is "comprehensive and that pilots have the information and training they need to fly the aircraft safely".
According to boxofficeindia.com, Kesari is performing well in North India, especially in Delhi and Punjab circuits. The film has become his second biggest opener after Gold , which made Rs 25.25 crore on its first day.
However, Taoiseach Leo Varadkar said the loan seemed "a bit unusual", as he believed the FAI would have access to bank loans. Sport Minister Shane Ross has asked Sport Ireland to compile a report on the issue which is expected in the coming days.
Local media in Pompano Beach , Fla., say the Canadians were found dead in their mobile home by their neighbours on Friday. It is a community of around 110,000 and has a variety of both French and English Canadians retirees living there.
A group of 17 mostly Democratic-led states including California and NY on Monday argued that the law was constitutional. The bill comes just as Trump's administration has said in a legal filing it wants the entire ACA struck down.
On Friday, all three major United States stock indexes clocked their biggest one-day percentage losses since January 3. The Australian dollar, a liquid proxy for risk play, was down for its third straight session of losses at US$0.7072.
Unlike some leaders in the region, his presidency survived the protests of the Arab Spring in 2011 - until now. Then, the president of the Senate would take hold of the reins of government until elections are held.
Wayfair to open first brick-and-mortar store
The Wayfair shop will have home design experts available to chat with shoppers for consultations and provide recommendations. Boston-based Wayfair says it will open pop-up shops this summer, but declined to say if it will open more permanent stores.
Jin Young Ko rallies to win LPGA Tour's Founders Cup
South Korea's Jin Young Ko hit a bogey-free final round to win the tournament by one shot. "I had to really focus on my game". Park fired a 69 to head a group on 201 that also included former world number one Lydia Ko of New Zealand, who posted a 67.