Canadian official warns regulators not to allow 737 MAX to fly, unless...

Ottowa, Canada - A Transport Canada expert says regulators shouldn't allow Boeing's 737 MAX to return to service unless the US manufacturer completely removes the aircraft's stall prevention software from the system.

Last week, Jim Marko, manager of aircraft integration and safety assessment at Transport Canada, urged global regulators with an email not to certify Boeing's 737 MAX until the company removes plane's anti-stall software known as MCAS (Maneuvering Characteristics Augmentation System).

The system was linked to both 737 MAX 8 crashes in Indonesia and Ethiopia killing 346 people.

Transport Canada has confirmed the authenticity of the email sent to aviation regulators by Jim Marko, including the FAA, EASA and Brazil's ANAC.

The Canadian official claims that Boeing's attempts, to solve the problem was so far unsuccessful.

Judging from the number and degree of open issues that we have, I am feeling that final decisions on acceptance will not be technically based,

wrote Jim Marko in his email.

This leaves me with a level of uneasiness that I cannot sit idly by and watch it pass by ... The only way I see moving forward at this point (and I say at this point because it's almost Christmas and we can always believe in miracles) is that MCAS has to go,

Marko also wrote.

Transport Canada said in a statement that Marko's email reflects working-level discussions between highly trained aircraft certification experts of key aviation authorities who have been given wide latitude in assessing all issues and looking at all alternatives for the aircraft's safe return to commercial service.

Marko's views have not been subject to a systematic review by Transport Canada, the Canadian regulator added.

Lihn Le, a system safety engineer at the FAA wrote in a separate email to his colleagues that he had a similar perspective with Jim Marko.

Le also stated that the Canadian officials were concerned about the risks that MCAS introduces because of the complexity of the system.

Also read: How the Boeing MCAS System Really Works