Commenting on Cathay Pacific grounding 48 planes for checks on Monday after a Zurich-bound flight had to return to the city shortly after take-off, SMU Assistant Professor of Strategy & Entrepreneurship (Education) Terence Fan said defective engine lines could affect fuel flow, which is "urgent and of critical importance". "This seems to be a mechanical issue... one would definitely not want the same to be found in two out of two engines on the same aircraft mid-air," said Asst Prof Fan. He said a mechanical problem could be fixed quickly by replacing parts, though he called it "a bad sign" the issue had hit one-third of Cathay's A350 fleet.