The group, which employs several hundred people at the Advanced Manufacturing Park in Rotherham, where it produces single-crystal turbine blades reported statutory interim pre-tax losses of £791 million against £1.2 billion a year ago.
On an underlying basis, half-year profits rose 16% to £94 million for the six months to June 30, while operating profits jumped 32% to £203 million.
Rolls said problems with its Trent 1000 turbines were still causing some customer disruption, while it hiked the estimated in-service costs of dealing with the issue by £100 million over the next three years.
The company has been beset by problems with its engines since the discovery in 2018 of technical issues with the Trent 1000s, which power the Boeing 787 Dreamliner jet.
Rolls also revealed an extra £59 million charge from Airbus’s decision to stop production of its A380 superjumbo aircraft, taking its total hit from the move to £245 million.
But it backed its 2019 guidance for underlying operating profit and free cash flow of £700 million, plus or minus £100 million.
Chief executive Warren East said: “We delivered further progress across the group in the first half in line with our full-year expectations.
“We have made good progress on resolving the Trent 1000 compressor issue, though, regretfully, customer disruption remains.
“Progress on our restructuring programme is in line with the plan we outlined a year ago.”
Mr East is leading a sweeping overhaul at the group, which has now cut around 2,500 jobs out of the previously announced 4,600 roles being axed to save £400 million by the end of 2020.
It took £69 million in costs related to the revamp in the first half.