US military tests massive GPS jamming weapon over California --Aircraft warned to stay out of area | 07 June 2016 | The US Federal Aviation Authority (FAA) is warning aircraft to stay a few hundred miles away from the Naval Air Weapons Station at China Lake, California, because the military is testing a new gizmo that disrupts GPS - and may also mess with flight control systems. The FAA has issued a Notice to Airmen (NOTAM) warning that on June 7, GPS readouts will be unreliable or nonexistent for 253 nautical miles (291 miles) at 50 feet above sea level, for 340NM (391 miles) at 4,000 feet, and for 375NM (431 miles) at 10,000 feet, covering a huge area of very busy airspace. In addition, the FAA is warning pilots flying the Embraer Phenom 300, one of the world's most popular executive jet aircraft, that the testing could interfere with flight stability controls and has said extra care should be taken in the area.