Rolls-Royce is hopeful that the number of Boeing 787s grounded by Trent 1000 engine problems could drop to single figures by the end of the year. Thirty-one 787s are currently grounded at airports around the world because of the engine issues, Rolls-Royce CEO Warren East told investors Feb. 28 as the company announced it 2018 financial results. The company is undertaking an extensive retrofit program for the Trent 1000 Package C and B engines for the 787-8 and -9 and the Trent 1000 TEN