According to a report on the website of El Español on April 12, a tourist helicopter flying over New York City recently crashed into the Hudson River, killing five people from Spain and a pilot. Currently, the US National Transportation Safety Board is investigating the accident. The cause of the accident is unclear. Several videos posted on social media show that at one point, the helicopter lost its tail rotor and main rotor. This directly led to the cabin portion falling into the Hudson River. The Bell-206 helicopter that crashed was manufactured in 2004. The model was discontinued in 2010. The owner of this helicopter is a company headquartered in Louisiana. An experienced helicopter flight instructor told El Español that any possible catastrophic problem "is almost always caused by the helicopter exceeding the flight envelope," either exceeding the helicopter's capabilities in terms of weight and center of gravity, or reaching "parameters beyond limits." The flight envelope is a set of safety operating parameters, including speed, altitude, turn rate, angle of attack, applied power, etc. The flight instructor said: "Within this 'safety bubble', the helicopter can fly safely and controllably." After multiple videos were released, one of the assumptions being analyzed by experts is that the accident may have been caused by a tail rotor failure. The flight instructor said: "The helicopter began to rotate violently to the right, which is the rotation direction when the tail rotor is lost." This violent rotation and related forces will cause the main rotor to oscillate excessively, which may lead to the blade striking the tail, causing it to break. This impact on the tail is called "mast strike" in aviation terminology. Experts believe that another possibility is that "the main rotor becomes unbalanced, leading to excessive oscillation of the blades," ultimately cutting off the tail. According to a report on the website of El País on April 12, for decades, residents around New York have complained about helicopters constantly flying overhead and sometimes deafening noise. After the air disaster that took the lives of a family of five from Barcelona and the pilot, this call for attention has resurfaced. In recent years, the disorderly expansion of the helicopter sightseeing industry has prompted experts, legislators, and associations to demand stronger regulation, especially in the field of safety, to prevent similar accidents from causing greater disasters. Jersey City Mayor Steven Fulop called for a halt to helicopter sightseeing flights over the Hudson River. Fulop wrote on the social platform X: "We have appealed to the federal government for ten years, but received no response. This is not the first accident. The reality is that the airspace in this densely populated area is too crowded to conduct such sightseeing flights." Both Fulop and anyone who has ever walked along the Jersey City riverside promenade know that if this helicopter had crashed closer to the riverbank, the consequences would have been unimaginable, as dozens of residential buildings are densely located there. (Translated by Tian Ce) Original source: https://www.toutiao.com/article/7493374617215517234/ Disclaimer: This article only represents the views of the author. Welcome to express your attitude in the [thumbs up/thumbs down] buttons below.