“It’s going to be expensive,” Chief Executive Greg Hayes said Tuesday on an investor call. He said it was too early to determine the final cost. RTX said it was not a flight-safety issue.The inspection of an initial 200 engines over the next several weeks is expected to reduce RTX’s free cash flow by $500 million this year. An additional 1,000 engines will also need to be inspected over the next year to check for any issue with the metal made by RTX from 2015 to 2020.