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The Allison AE3007 is the powerplant for the Global Hawk, an unmanned, very high altitude reconnaissance aerial vehicle, the EMBRAER 145, a 50-passenger regional airliner, and the Citation X, a high-performance business jet. The engine produces 7,200 pounds of thrust at sea level and had been qualified at an altitude of 51,000 feet. In sharing a common core with the engines that power the V-22 Osprey, the Lockheed Martin C-130J, the ShinMaywa US-1A Kai, the LMATTS C-27J and the Saab 2000 - the AE 3007 benefits from over 17 million hours of cumulative service experience of all AE common core applications.

The AE3007 turbofan core is derived from the AE1107 turboprop engine and is in the 8,000lb thrust class. It was developed to provide a turbofan member of the AE common core family for the growing regional jet and medium/large business jet markets. Designed with excellent reliability, maintainability and performance in mind, the capability and versatility of the AE 3007 turbofan is demonstrated by its use in regional, corporate and military applications. Since its entry into service in 1995 on the Citation X, the fastest corporate jet in the world, Rolls-Royce has delivered nearly 2500 AE 3007 engines to Cessna and Embraer. Over the first seven years of operation on Embraer's 37 to 50 seat Regional Jets the AE 3007A achieved over 10 million hours service experience, powering over 750 Embraer deliveries. In service today the AE 3007A accumulates over 300,000 hours service experience every month - equivalent to one take-off or landing every 20 seconds - and with Embraer's AE 3007A powered order book standing close to 1400 aircraft, this growth is set to continue. Featuring class-leading environmental technology and delivering the durability, reliability, maintainability and performance required across regional, corporate and military operations, the AE 3007 continues to grow from strength to strength.

The engine underwent 69 air-on hours at high altitude in AEDC's Propulsion Development Test Cell T-1. The AE3007 also completed an additional 28 air-on hours of Type IV Fan work in support of the EMBRAER 145 project. This test program marked the first-time AEDC on-line use of the new Silicon Graphics workstation. It was used during testing to compare engine math models to on-line test data. This assured proper data validity and prevented a loss of air time for repetition of test cases.

AEDC testing supplied the data necessary to define the required design changes Allison will incorporate in the engine to allow the AE3007 to perform well at high altitudes. Prior to this AEDC test, the AE3007 engine had operated at altitudes of slightly over 50,000 feet. The AEDC testing subjected the engine to a simulated altitude of over 70,000 feet. The testing was completed on time, under budget and in a very professional manner.

The Global Hawk is a state-of-the-art, unmanned high-altitude reconnaissance aerial vehicle. With a 116-ft wingspan and a design takeoff gross weight of 24,000 pounds, the Global Hawk is designed to operate at 65,000 feet for periods of 24 hours or more. The Global Hawk will be able to complete missions in hostile environments previously reserved for piloted vehicles, thus keeping the pilots out of harm's way. This test established a basis for future AE3007 AEDC testing, as the Global Hawk project moved into the Full Scale Development phase. The AE3007 tests re-established Allison as an AEDC test customer. The last AEDC test of an Allison engine, the TF41, took place in 1979.

The capabilities of the fourth-generation nonintrusive stress measurement system (NSMS) were demonstrated in tests of an AE3007 turbine engine conducted at Allison Advanced Development Company. The test was a joint effort between the United States (US) and the United Kingdom (UK) to compare respective measurement systems used to support the investigation of high-cycle fatigue (HCF) in military turbine engines. The test was intended to benchmark the capabilities of the US and UK systems.

High Altitude Performance Improvements for Global Hawk technology provides increased high altitude electrical power generation capability that will provide the Global Hawk with 75kW of payload power at high altitude (65K feet). This is triple the current onboard power capability and allows the Global Hawk to support planned payloads that cannot be supported with the existing power system. The improved electrical power generation provides the additional power for the Global Hawk system to meet Mission Area Needs for expanded data fusion, ground/airborne target ID, and EO/IR countermeasures. The proposed concept extracts power from the AE3007 engine's low pressure (LP) turbine instead of the high pressure (HP) turbine. LP spool power extraction versus HP spool power extraction enables the Global Hawk to achieve U-2 sensor parity. The system benefits to Global Hawk of LP spool power extraction relative to HP spool power extraction are: 5.1% increase in endurance, 6.7% increase in maximum altitude, and 4.2% increase in range. The TTI initiative accelerates the transition of this technology by 24 months.

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Page last modified: 07-07-2011 02:35:51 ZULU