What could be wrong with the 737 Max and what it means for Boeing

When it launched in 2016, the 737 Max was U.S. jet-maker Boeing's best weapon in the war for market share with European rival Airbus. The two companies compete head-on for the biggest slice of that market booming demand for narrow-body jets that can carry 170 or more people across long distanceswhile usingas little jet fuel as possible.

Boeing's 737 is the yin to the yang of the Airbus A320, and both planes have been workhorses of global air travel for a generation. Both models were looking a little long in the tooth about a decade ago, but since they were both still selling well, neither company was in a rush to build a new model, said Rob Rennert,who runs aviation consultancy Elevate.

Then, Canada's Bombardier came out with plans to build what would come to be known as the C Series, "and it was a game changer," Rennert said. "They realized that they had to respond [but] they didn't want to spend the money building a whole new plane, so instead they made incremental improvements on existing ones."

The result was Airbus's creation of theA320NEO an acronym for "new engine option" and Boeing's 737 Max, both of which were well received by the market, booking brisk sales.

In barely two years since first deliveries of the jet started in early 2017, Boeing has put almost 400 Max jets into service, all of which are now flying under a dark cloud of uncertainty after anEthiopian Airlines Max jet crashed shortly after takeoff, killing 157 people on board,including 18 Canadians.

Coming on the heels of another crash in Indonesia last fall, regulators around the world have grounded the jet pending an investigation.

The Max is just the latest iteration of the original 737, the best-selling commercial jet of all time. But while it shares the 737 name, aviation experts say there are a few design changes in the Max that may be contributing to the sudden tarnishing of that iconic name.

Fuel efficiency is the name of the game formodern airlines, and the best way to make a plane better on gas is to give it a bigger engine.

The Max jets boast engine fansthat are eight inches (20.3 centimetres)wider than the previous model. To accommodate the bigger engines,"they moved them further forward and further up" on the wing, aviation consultantKeith Mackeysaid. "And when they did that they changed the centre of gravity."

Pilot Mary Schiavo says those changescan cause the nose of the plane to pitch up in the air.

"And if it pitches up too far the plane can stall," she said on CBC's Front Burner podcast on Wednesday.

That would be an unexpected problemto anyone familiar with the older 737, which is why Boeing tried to proactively override itby installing software on the planes that would push the nose of the plane back down when the system detected something wrong.

The problem? "They forgot to tell pilots about it," Mackey said.

U.S. pilots had reported instances of ithappening but managed to assess what was going onand override the autopilotwhen necessary. But he says less-trained, less-experiencedpilots outside Europe and North America are less likely to adjust if something goes awry.

"They depend on automation," he said. "And when something like that happens, Idon't know whether they would know whether to disconnect the autopilot or just try to override it."

Instead of the onerous testing that would be needed on a truly new plane, Boeing simply added a section aboutthe software to the plane's manual, and offered extra training on the jet if requested. Schiavo, aformer inspector general of the U.S.Department of Transportation,saysthat's not good enough.

"You can't troubleshoot an aircraft full of passengers on takeoff. It's the most dangerous part of the flight,and you can't tell a pilot, 'If this goes wrong, you fix it'," she said.

"No,Boeing, it was your job to fix it."

Anthony Roman, president of the risk management and investigation firmRoman and Associates, says Boeing has done more than anyone over the years to improve plane safety. But even he says the company's moves with the 737 Max have been lacking.

Part of theindustry'sreluctancetoward more training is likely the enormous cost associated with it, Roman said.

"Wecannot count dollars when it comes to pilot training and preparing pilot flight manuals so that they fully understand how the systems work and how to deal with emergencies," he said in an interview.

Schiavo saidBoeing is financially vulnerable if there's a systemic problem that needs fixing with its jet, just as a carmaker is on the hook when regulators demand safety recalls of their automobiles. "If they can do it piecemeal over a period of months rather than all at once it is much less expensive," she said, but now that the jet has been grounded virtually worldwide Boeing could be facing a significant up-front costs.

The Ethiopian Airlines disaster was without questiona human tragedy first and foremost. But the repercussions of the crash arealready havingsome serious financial consequences for Boeing.

The company's shares have fallen by more than 13 per cent since Sunday's crash, the company's worst stumble since the financial crisis.

That's likely because investors are well aware of how critical the Max jet is for the plane-maker's future.

Boeing is on track to rake in just over $110 billion US this year in revenue from selling planes. But more than a third of its profits will come from the580 Max jets the company was on track to deliver this year,more than twice what they sold in 2018. There are 5,000 more more than $600 billion worth on back order, according to Bloomberg data.

Bloomberg aerospace analyst George Ferguson saidif the company has to come up with a full replacement for the 737, that could cost it $10 billion or more."Reaction by fliers and governments globally is likely to hurt market share if the airplane's systems aren't updated quickly and confidence restored," he said.

But ultimately, whatever financial cost the company must pay today could well help them in the long run, Roman said.

"I think it will be a short-term economic impact for them. and that may be appropriate because it helps drive future decisions for safety," he said.