http://edmonton.ctv.ca/servlet/an/l...electronics-110610/20110610/?hub=EdmontonHome A confidential airline industry report into the dangers posed by electronic devices should raise alarm bells among passengers who refuse to follow the rules, says one aviation expert. The secret industry report obtained by ABC News documents 75 cases where passengers' personal electronic devices (PEDs) were believed to have interfered with a plane's operation. The U.S. news agency reported that 26 of the incidents affected the plane's flight controls, such as the autopilot, auto thrust and landing gear. Another 17 affected navigation systems while 15 of the incidents documented interference with communication systems and 13 resulted in electronic warnings on the planes. The report is believed to comprise some of the first evidence that PEDs such as cellphones -- most often believed to be the culprit in the incidents cited in the report -- as well as laptops, iPads and iPods, can actually interfere with a plane's systems. While airlines have long warned of the risk and asked passengers not to use such devices, especially during takeoff and landing, many passengers openly ignore the warnings. Airline analyst Vernon Grose said the concerns in the report are legitimate. He told CTV's Canada AM that in the past planes used mechanical pulleys and cables running from the cockpit to the rest of the plane, to control its functions. Now, planes use a system called "fly by wire," meaning commands from pilots are converted into digital signals that are sent via wires through the plane, to control various functions. As a result, electronic devices have the potential to interfere with vital communication and navigation signals, he said.