(Photo: CGTN)

Singapore Airlines (SIA) grounded two Boeing 787-10 aircraft due to engine issues, the airline said in a statement on Tuesday. 

"During recent routine inspections of Rolls-Royce Trent 1000 TEN engines on Singapore Airlines' Boeing 787-10 fleet, premature blade deterioration was found on some engines," said SIA. 

The grounding came after Singapore temporarily suspended the operation of all variants of the Boeing 737 Max aircraft in its airspace on March 12 in the wake of two fatal airline crashes involving Boeing 737 MAX jet.

Boeing said on Monday it planned to submit a proposed software enhancement package for the grounded 737 MAX in "the coming weeks" after the company had previously said it planned to deliver the fix for government approval by last week.

"We are working to demonstrate that we have identified and appropriately addressed all certification requirements and will be submitting for the Federal Aviation Administration (FAA) review once completed in the coming weeks," Boeing said. "We will take a thorough and methodical approach to the development and testing of the update to ensure we take the time to get it right."

American Airlines Group said it was aware that the resumption of service for its 737 MAX aircraft may be further delayed and said it was working with all customers impacted by any flight cancellations.

More than 300 Boeing 737 MAX jets have been grounded worldwide after two crashes – in Indonesia in October and in Ethiopia last month – killed nearly 350 people.