The lone survivor and the families of Cougar Flight 491 victims want Transport Canada to explain why  Cougar’s helicopter was certified without a 30-minute run dry capability. They’re asking federal Transport Minister Chuck Strahl to investigate the certification of the Sikorsky S-92 and “take all necessary measures” to prevent another “senseless tragedy.” Lori Chynn, who’s husband died in the crash, said offshore workers deserve a helicopter that can stay in the air for at least 30 minutes without oil. “This helicopter doesn’t have the capability that’s needed … to transport workers offshore. It’s all about safety,” she said.