The Transportation Security Administration is commissioning a study about whether the X-ray body scanners used to screen passengers at airports emit too much radiation. The study also will evaluate whether the design and maintenance of machines that use X-ray technology could prevent over-exposure to harmful radiation. The safety of X-ray screening machines was called into question in a 2011 report by ProPublica, a non-profit investigative news group, which suggested that up to 100 U.S. airline passengers per year could contract cancer from airport screenings.

It has been called the most significant advance in jet engines since the turbofan: development of variable-cycle “third stream” engines with 25% lower specific fuel consumption than today's fighter powerplants. General Electric and Rolls-Royce will ground-test demonstrator engines in 2013, and GE and Pratt & Whitney are under contract to mature the technology and test new adaptive-fan engine designs in 2016. In addition to the high-pressure core and low-pressure bypass streams of a conventional turbofan, these variable-bypass engines have a third, outer flowpath.

General Electric has confirmed it will purchase Italian aero engine specialist Avio SpA from Cinven, a European private equity firm, and government-owned defense group Finmeccanica for €3.3 billion ($4.36 billion).

Advances in rocket engine technology do not come along often, so it was noteworthy in October 2012 when Orbital Technologies flew a sounding rocket powered by its “vortex” engine, which injects fuel and liquid oxygen so the burning mixture does not touch the walls of the combustion chamber, allowing it to be thinner, lighter and cheaper. Oxidizer is injected at an angle that sets up a pair of coaxial vortices. Combustion occurs in the innermost swirl, the outer vortex protecting the chamber walls from the heat of combustion.

European government bickering scuttled a mega-merger of EADS and BAE Systems, and the Pentagon continues to hold firm against further consolidation among its top contractors. But consolidation amid second- and third-tier contractors is likely to accelerate as defense spending heads down in the U.S. and Europe.

NASA Space Launch System (SLS) advocate Sen. Kay Bailey Hutchison (R-Texas) is leaving Capitol Hill, but the program should get a boost by meeting an early test. An engineering board has cleared the first element of the heavy-lift rocket for preliminary manufacturing, keeping the program on track for a first flight with the Orion multipurpose crew vehicle in 2017.

Market shifts, new competitors bring change to launch-vehicle business

NASA wants $800 million in fiscal 2013 for its program to outsource the transport of crews to and from space, and says if it does not get the funding first commercial flights to the International Space Station will slip to 2018. With station funding set to expire in 2020, that could be a problem.