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With the threat of the GE/RR F136, Pratt & Whitney has funded an adaptive fan variant of its F135, that may qualify for the follow-on ''Adaptive Engine Technology Development'' (AETD) program under the US [[Air Force Research Laboratory]].<ref>Majumdar, Dave. [http://www.flightglobal.com/news/articles/farnborough-pratt-to-test-new-adaptive-fan-f135-variant-next-year-374283/ "FARNBOROUGH: Pratt to test new adaptive fan F135 variant next year."] ''Flight International'', 12 July 2012.</ref>
In 2012, GE was chosen to continue its ADVENT work into the AETD program.<ref>Brooks, Robert. [http://americanmachinist.com/news/usaf-taps-ge-develop-new-jet-engines "USAF Taps GE to Develop New Jet Engines."] ''American Machinist'', 21 October 2012.</ref> GE and Pratt & Whitney were selected over Rolls-Royce to continue the AETD program to mature fuel-efficient, high-thrust powerplants.<ref>Warwick, Graham. [http://www.aviationweek.com/Article.aspx?id=/article-xml/asd_09_18_2012_p01-02-496815.xml "Pratt In, Rolls Out, GE Stays On AFRL Advanced Engine Demo."] ''Aviation Week'', 18 September 2012.</ref> Operational testing of the engine was expected to begin in 2013.<ref name="rrpress"/> Under AETD, GE had set new records with the highest demonstrated compressor and turbine temperatures.<ref>{{cite web |last=Clark |first=Colin |url=https://breakingdefense.com/2015/06/ge-sets-aetd-record/ |title=GE Jet Sets Record; Will F-35 Get New AETD Engine? |work=Breaking Defense |date=18 June 2015 |access-date=11 January 2020}}</ref> In 2017, Pratt wrapped up tests of their three stream engine with a F135 core.<ref>{{cite news |url=https://www.defensenews.com/digital-show-dailies/air-force-association/2017/09/18/pratt-whitney-completes-tests-for-new-adaptive-engine-that-could-power-future-fighter/ |title=Eyeing the future fighter, Pratt & Whitney hits milestone with new adaptive engine |last1=Insinna |first1= Valerie |date=18 September 2017 |website=www.defensenews.com |publisher=Sightline Media Group |accessdate=10 August 2018}}</ref>
In 2016, the Adaptive Engine Transition Program (AETP) was launched with the goal of developing and testing adaptive engines for the future sixth generation fighter programs, Penetrating Counter Air (PCA) or [[Next Generation Air Dominance]] (NGAD) for USAF and [[F/A-XX program|F/A-XX]] for US Navy, as well as potential re-engining of the F-35. The program assigned the new designations [[XA100]] for General Electric's design and [[XA101]] for Pratt & Whitney's.<ref name="fg20180709">{{cite web |last=Trimble |first=Steven |url=https://www.flightglobal.com/fixed-wing/usaf-starts-work-on-defining-adaptive-engine-for-future-fighter/128748.article |title=USAF starts work on defining adaptive engine for future fighter |work=Flight Global |date=9 July 2018 |access-date=11 January 2020}}</ref> The next generation fighter engine would eventually become separate from the F-35 efforts due to the different optimizations required and was split off into the Next Generation Adaptive Propulsion (NGAP) program. The competing designs for NGAP are the [[General Electric XA102|XA102]] from General Electric and [[Pratt & Whitney XA103|XA103]] from Pratt & Whitney.<ref>{{cite web |last=Tirpak |first=John |url=https://www.airandspaceforces.com/air-force-budget-finish-design-new-fighter-engine/ |title=Air Force Wants $1.3 Billion to Finish Design for New Fighter Engine |work=Air and Space Forces Magazine |date=5 April 2024}}</ref>
==See also==
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