What we know about the Boeing 737 Max 8

Boeing saidit is sending a technical team to the site of the crash of an Ethiopian Airlines flight that killed 157 people, including 18 Canadians, following another recent crash in Indonesia of thenew, popularairplane model,the 737 Max8.

The737 Max8 crashed Sunday shortly after takeoff from Bole airport in Ethiopia's capital Addis Ababa en route to Nairobi on Sunday.

The aircraft was also involved in a Lion Air crash in October when a two-month-old plane plunged into the Java Sea minutes after taking off from Jakarta, Indonesia, killing 189 people.

In Canada, Air Canada,WestJetand Sunwing use the aircraft Air Canada saidthe modelhasperformed safely and reliably, and WestJet saidit will not speculate on the cause of the incident.

Air Canada said it has offered its assistance in the investigation. The airline said it has operated the same type of passenger jet since 2017, when the model entered commercial use,and currently has 24 in its fleet.

"These aircraft have performed excellently from a safety, reliability and customer satisfaction perspective," an Air Canada spokesperson said in anemailedstatement to CBC News.

WestJet said it has 13 of the Boeing 737 Max8in its fleet.

Sunwingflies four 737 Max8 airplanes. The company did not immediately respond to requests for comment.

Ethiopian authorities saidthe pilot in Sunday's crash sent out a distress call and was given clearance to return.

Records show the plane was new and had been delivered to the airline in November.

Questions about aircraft model

Sunday's crash is likely to renew questions about the 737 Max8.

First entered into service in 2017, the Maxsingle-aisle aircraftis one of Boeing's fastest-selling models yet. Anew engine, theLEAP-1B, helps make the plane 14 per cent more fuel efficient than the previous version.

By the end of January, Boeing had delivered 350 Maxjets to clients out of atotal order tally of 5,011 aircraft.

Indonesian investigators have not determined a cause for the October crash in Indonesia, but days after the accident Boeing sent a notice to airlines that faulty information from a sensor could cause the plane to automatically point the nose down. The notice reminded pilots of the procedure for handling such a situation.

The Lion Air cockpit data recorder showed that the jet's airspeed indicator had malfunctioned on its last four flights, though the airline initially said problems with the aircraft had been fixed before it left the Indonesian capital of Jakarta.

Dennis Tajer, a spokespersonfor the AlliedPilots Association who flies the 737 Max8for American Airlines, said Boeing had not initially informed pilots about some of the plane'sfeatures.

"There is a system called MCAS, theManeuvering Characteristics Augmentation System, which was not in our manuals prior to the Lion Air tragedy," Tajer told CBC News. "Boeing at the time had not chosen to disclose that information."

He added that pilots now have information about the system. Echoing statements from other safety experts, hesaid it was too early to speculate about the causes of theEthiopian Airlines crash.

"I am soundly confident in the aircraft's safety," he said of the 737 Max8. "If we weren't confident, we wouldn't be flying it."

The Ethiopian Airlines CEO "stated there were no defects prior to the flight, so it is hard to see any parallels with the Lion Air crash yet," said Harro Ranter, founder of the Aviation Safety Network, which compiles information about accidents worldwide.

'We cannot rule out anything'

State-owned Ethiopian Airlines is widely considered the best-managed airline in Africa and calls itself Africa'slargest carrier. It has ambitions of becoming the gateway to the continent and is known as an early buyer of new aircraft.

"Ethiopian Airlines is one of the safest airlines in the world. At this stage we cannot rule out anything," CEO Tewolde GebreMariam said.

The last deadly crash of an Ethiopian Airlines passenger flight was in 2010, when a plane went down minutes after takeoff from Beirut, killing all 90 people on board.

Thelast maintenance of the jet that crashed Sunday was on Feb. 4, and it had flown just 1,200 hours. The pilot was a senior aviator, joining the airline in 2010, the CEO said.

The Boeing 737 Max8 was one of 30 being delivered to the airline, Boeing said in a statement in July when the first was delivered.

Planes grounded in China

Boeing said itstechnical team was ready to provide assistance at the request of the U.S. National Transportation Safety Board.

Late on Sunday, Boeing said itwill postpone the planned ceremonial debut of its 777x widebodyaircraft thathad been planned for Wednesday, following the crash of the Max 8.

China's aviation regulator ordered Chinese airlines to suspend their Boeing 737 Max aircraft, Chinese media outlet Caijing reported on Monday local time.

Caijing, citing industry sources familiar with the matter, said Chinese airlines, which operate some 60 such airplanes, had received orders from the Civil Aviation Administration of China (CAAC) and halted their use on Sunday.