Singapore Airlines grounded three of its Airbus A380 planes on Wednesday to replace their engines after finding oil stains on them.
They use the same Rolls-Royce engines as the six Qantas A380s which have been grounded since Thursday due to oil leakages.
But Singapore Airlines stressed the problems on three of its eleven-strong fleet were precautionary and unrelated as the oil stains were different from the leakage in the Qantas turbines.
“This is a precautionary move to find out what caused the oil stains,” a Singapore Airlines spokeswoman said.
“Rolls-Royce recommended a detailed inspection of the engines,” she added.
Passengers scheduled to travel on the affected Singapore Airlines planes were transferred to other flights.
Qantas is expected to give an update on its A380 fleet on Thursday.
Shares in engine manufacturer Rolls-Royce, not to be confused with the car company of the same name, have lost more than seven percent in the past four days.
They closed at 606.5 pence in London trading on Tuesday.
Singapore Airlines grounds oil-stained A380s