Boeing 737 MAX aircraft are now subjected to intense scrutiny and testing designed to catch flaws [File: AFP]

The US Federal Aviation Administration (FAA) has identified a new risk that Boeing must address on its beleaguered 737 MAX aircraft before the grounded jet can return to service.

The risk was discovered during a simulator test last week and it is not yet clear if the issue can be addressed with a software upgrade, or will require a more complex hardware fix, sources with knowledge of the matter said on Wednesday.

“Boeing agrees with the FAA’s decision and request and is working on the required software to address the FAA’s request,” Boeing said in a statement.

The FAA did not elaborate on the latest setback

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