Federal regulators let Boeing write the safety conditions for the problematic battery system in its beleaguered 787 "Dreamliner," prescribe how to test it and carry out those tests itself, according to testimony and documents released at a hearing Tuesday, AP reported. As airlines prepare to resume flying the 787 after a three-month grounding, the National Transportation Safety Board is looking at how the Federal Aviation Administration, Boeing and the company's subcontractors tested and approved the 787's lithium ion batteries, and whether the government grants aircraft makers too much leeway when it comes to safety. Batteries aboard two 787s failed less than two weeks apart in January, causing a fire aboard one plane and smoke in another. The root cause of those two incidents is still unknown. -- SPA 22:10 LOCAL TIME 19:10 GMT تغريد