By Robert Wall

LONDON--Rolls-Royce Holdings PLC (RR.LN) chairman, Ian Davis, said the engine maker's strategy to work on sectors spanning ships, land-based turbines and airplanes wouldn't change, as the company said Warren East would replace John Rishton as chief executive.

"I and the board are very comfortable with the strategic direction of the company," Mr. Davis said in an interview.

Rolls-Royce said Wednesday that Mr. Rishton would retire in July. The company's share price has lagged rivals amid profit warnings and problems because of weakness in some key markets. Earnings, particularly in its land and marine engine business, have been hit by low oil prices, prompting some calls for the company to focus on its growing aircraft engine business.

"One bumpy year financially…doesn't rubbish the strategy immediately," Mr. Davis said.

Incoming chief executive, Mr. East--who was already on the Rolls-Royce board as a non-executive director--said the near-term focus would be on driving restructuring measures put in place by Mr. Rishton. "This is not a business that changes in the short term," he said, adding that "naturally, over many years, the strategy evolves."

One of the issues for the new Rolls-Royce management team will be figuring out how to re-enter the narrowbody aircraft engine market: by far the largest sector of commercial flying. Rolls-Royce was a partner with Pratt & Whitney, the engine unit of United Technologies Corp., before exiting several years ago as it opted not to invest in a new turbine design.

Mr. Davis said he wanted Rolls-Royce to re-enter that sector, though echoed Mr. Rishton's view that doing so wouldn't be done alone because of the scale of the financial commitment and risk of such a project. "Partnering in some form is a very important part of our approach to get into the narrowbody," he said.

Write to Robert Wall at robert.wall@wsj.com

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