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  9 août 2019 | International, Aérospatial

  US Air Force pauses flight ops for more than a hundred C-130s over ‘atypical’ cracking

  By: Valerie Insinna WASHINGTON — More than a quarter of Air Mobility Command's C-130 Hercules fleet are being temporarily removed from service after “atypical” cracking was found. During scheduled depot maintenance, the U.S. Air Force discovered cracking of the lower center wing joint — also known as the “rainbow fitting” — which led Air Mobility Command head Gen. Maryanne Miller to order an inspection of a portion of the fleet, according to an AMC statement released Wednesday evening. A total of 123 of 450 C-130H and C-130J aircraft will be temporarily grounded while inspections occur. “This temporary removal of service will not impact ongoing C-130 support to overseas contingency operations,” AMC said in its statement. The decision to pause operations and conduct inspections was made after a single C-130 was found with the lower center wing joint cracks, said AMC spokesman Maj. Jonathan Simmons. But the risk posed by the issue — that the wing could become dislodged from the aircraft — was so serious that the Air Force decided to move forward with inspections for all planes that could potentially be impacted. The 123 aircraft chosen to go through inspections have not been equipped with an “extended service life center wing box” and have flown more than 15,000 hours. Maintainers will look for cracking, and, if discovered, will replace the rainbow fitting. That repair takes “approximately one to two months” to do and is “dependent on depot level availability and capacity,” Simmons noted in an email. Currently, AMC believes it has an adequate supply of rainbow fittings and is not concerned about a potential shortfall. If no defects are found, the aircraft will return to service. So far, eight aircraft have gone through inspections and are now able to fly, Simmons said. Each inspection is set to take eight hours, but the command does not know how long it will take to move all 123 aircraft through the inspection and repair process. “The Air Force takes the safety of its airmen and aircraft very seriously and is working diligently to identify and repair affected aircraft as soon as possible,” AMC said in its statement. https://www.defensenews.com/air/2019/08/08/air-force-pauses-flight-ops-for-more-than-a-hundred-c-130s-after-atypical-cracking-found/

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  10 juillet 2024 | International, Aérospatial

  McConnell-based KC-46 completes round-the-world flight in 45 hours

  A KC-46A tanker from McConnell AFB completed a record round-the-globe sortie in 45 hours, a mission that saw multiple aerial refuelings — and a birthday.

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  24 août 2020 | International, Aérospatial

  Rolls-Royce backs hypersonic-power specialist Reaction Engines with new investment

  By: Andrew Chuter LONDON – Rolls-Royce has formed a strategic partnership with British hypersonic-power experts Reaction Engines and is backing that up with a new investment in the company. The new partnership is aimed at developing high-speed propulsion systems for defense and civil applications as well as exploring Reaction Engines' key thermal management technology as part of Rolls-Royce's own gas turbine engines and hybrid-electric systems. Rolls-Royce will invest £20 million ($26 million) over the next two years, building on an initial equity investment made in 2018. Other investors like BAE Systems, Boeing Horizon-X and financial institutions could follow suit, said a Reaction Engines spokesman. The announcement comes as Rolls-Royce steps up its interest in supersonic flight. Earlier in August, Virgin Galactic revealed a delta-winged Mach 3 sub-orbital vehicle concept powered by Rolls-Royce. Earlier this year the British engine builder said it was collaborating with the U.S. company Boom Aerospace on propulsion options for a Mach 2.2 airliner called Overture. “We have been working closely with Reaction Engines for the past two years, including exploring the potential of high-Mach systems for defense applications, and I am delighted that we are able to strengthen that relationship,” said Mark Thompson, director of global strategy and business development at Rolls-Royce.” “Reaction Engines' thermal-management skills, added to our suite of existing technologies and capabilities, will further assist us as we explore opportunities in supersonic and hypersonic aviation,” Thompson added. The two companies have also been involved with BAE and the UK Ministry of Defence in the first phase of a contract related to high-Mach advanced propulsion systems which could eventually find their way on to the British Tempest sixth-generation combat aircraft development. Aerospace and defense consultant Howard Wheeldon, of Wheeldon Strategic Advisory, said the tie-up demonstrated the determination of both companies to be at the forefront of high-speed engine development going forward. “The future of aerospace development from here on is about creating greater efficiency of operation and sustainability. Speed, including supersonic and hypersonic aviation development, will be an important part of this, and high-Mach advanced propulsion systems combined with the potential to apply some of the developed Reaction Engines technology within existing gas turbine engines together with what this offers for future hybrid-electric systems is of huge importance to a world-leading aerospace company such as Rolls-Royce,” he said. Reaction Engines CEO Mark Thomas said the partnership will help speed commercialization of the technology. “This strategic partnership is about developing market-ready applications for Reaction Engines' technology in next-generation engines and is a significant step forward for our technology commercialization plans,” said Thomas. Based at Culham, southern England, and with a test site at Denver, Colorado, Reaction Engines has been developing technology to power aircraft and rockets at supersonic and hypersonic speeds of Mach 5 and above – more than twice the speed of the Concorde. Last October Reaction Engines announced its key lightweight air cooling technology had been tested at its Colorado facility as part of the Defense Advanced Research Projects Agency's HTX project. At the time Reaction Engines said its heat exchanger had been exposed to hypersonic conditions approaching 1,000 degrees centigrade (1,800 degrees F). The heat exchanger performed its precooler function by quenching about 1,800-degree Fahrenheit temperatures in less than one-twentieth of a second. Wheeldon said the Colorado test was a significant step in the development of Reaction Engines' SABRE rocket engine program. “As an enabling technology for a potentially large range of other precooled propulsion systems that have potential commercial applications, the successful testing last year by Reaction Engines of its precooler heat exchanger at airflow temperatures conditions representing Mach 5 was a significant milestone in the development of its revolutionary SABRE air-breathing rocket engine. The new strategic partnership with Rolls-Royce offers further the commercial opportunities and potential for both companies,” said Wheeldon. SABRE, which stands for Synergetic Air Breathing Rocket Engine, is a propulsion system being developed to operate in air breathing and rocket modes using the pre-cooler technology. https://www.defensenews.com/global/europe/2020/08/21/rolls-royce-backs-hypersonic-power-specialist-reaction-engines-with-new-investment/