Rolls Royce has secured a £740m order to supply engines for a fleet of Airbus A330 planes operated by China Eastern Airlines.
The deal comes just days after it was suggested that a fault in a Rolls-Royce Trent 900 engine forced an aircraft to make an emergency landing.
The incident is under investigation.
China Eastern's order is for Trent 700 engines and includes a long-term service agreement.
"We are delighted that China Eastern continues to put its trust in our leading-edge Trent technology," said Steve Miller, Rolls-Royce's civil aerospace vice president in China.
The British firm signed the deal on the first day of the Prime Minister's trade mission to China.
Liu Shaoyong, chairman of China Eastern, said the airline was pleased to be working with Rolls-Royce as it had found previously order Trent 700 engines to be "extremely effective in service."