United Technologies Corp (UTX.N) on Thursday named Robert Leduc as president of its Pratt & Whitney aircraft engine division, succeeding Paul Adams, who is retiring. The change comes as Pratt is ramping up production of its geared turbofan aircraft engine for Airbus (AIR.PA), Bombardier Inc (BBDb.TO) and Embraer SA (EMBR3.SA) jetliners. Pratt also supplies F135 engines to the F-35 Joint Strike Fighter program operated by Lockheed Martin Corp (LMT.N), and is preparing to increase production.