![]() ![]() Pratt & Whitney engineers developed a state-of-the-art gear system that separates the engine fan from the low-pressure compressor and turbine, allowing each of the modules to operate at their optimum speeds. By placing the gearbox between the fan and the engine, the fan only turns at one-third the speed of the turbine. ![]() In conventional engines, the fan and turbine are directly connected and rotate at the same speed. The geared turbofan is the first commercial jet engine that uses gears to drive the fan. That results in an engine that’s 50 percent quieter and up to 16 percent more fuel efficient than traditional units. The engines increase efficiency by spinning fan blades more slowly than traditional commercial airline engines. All trade names, trademarks and manufacturer names are the property of their respective owners.Pratt & Whitney is pinning its future on a new family of jet engines such as the PurePower PW1100G-JM (the Airbus version) and the PW1500G (Bombardier’s version). ![]() Reference herein to any specific commercial products by trade name, trademark, manufacturer, or otherwise, is not meant to imply or suggest any endorsement by, or affiliation with that manufacturer or supplier. The information is for reference only and we do not guarantee the completeness, accuracy or currency of any manuals. For proprietary reasons we generally only provide civil manuals and blueprints on obsolete Aircraft / Engines / Helicopter. This manuals and blueprints are not meant to be used for current update material for certification / repair, but make an excellent reference for the scholar, collector, modeler or aircraft buffs. These are either ORIGINAL or COPIES of manuals and blueprints used when these aircraft were in active duty, now transferred into electronic format. Pratt & Whitney JT4A Aircraft Engines Overhaul Manual -ĭisclaimer: This item is sold for historical and reference Only. ![]()
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