This is happening even as there are specific rules under the Civil Aviation Requirements (CAR) framed by aviation regulator DGCA which make it mandatory that all planes, imported after 2008, must have the Cockpit Door Surveillance System (CDSS) installed.
But it has become a practice with many airlines to "apply for exemption on one ground or other and they get the exemption without providing any detailed explanation", the sources, refusing to be named, said.
The officials did not specify which airlines were flouting these norms, nor did they divulge the exact number of such aircraft. But there are a "large number of planes which are flying without CDSS".
This alarming trend is being witnessed even after several recommendations were made by Indian and international aviation security authorities and agencies after the 9/11 terror strikes in the US, where airplanes were used as weapons.
The revelation by the sources come at a time when loopholes in aviation security are being plugged worldwide, with the United States' National Transportation Safety Board even considering making Cockpit Video Recorders mandatory on all US registered aircraft by January 1, 2014, to watch the happenings inside the cockpit at all times in-flight.
The CDSS helps the pilots view happenings outside the cockpit through a special application which connects integrated video computer, video cameras and a system controller.
Post 9/11, aviation regulators worldwide adopted new security measures, including the installation of bullet-proof cockpit doors and CDSS. (More)
