Let Me Tell You ...

 ... immediately comes to mind ... Chicago, 1979, American Airlines Flight 191. DC-10. Now ... same type of plane MD-11, exactly same horror--losing engine at the take-off. 

The reasons for two crashes are different of course, in case of AA Flight 191 all possible instructions during servicing and reattaching left engine have been violated, including forced tightening of the the bolt. Here--metal fatigue. 

Iran's President Confirmed Dead...

It has been confirmed and the video from the crash site tells about catastrophe, not the hard landing, The helicopter is completely destroyed bar its boom.  

Iranian state media have confirmed that President Ebrahim Raisi was killed in a helicopter crash in the northwestern province of East Azerbaijan. His entire entourage, including Foreign Minister Hossein Amir-Abdollahian and Governor of East Azerbaijan Malek Rahmati, also perished, Press TV said. The head of state had traveled to the border region after joining Azerbaijan’s President Ilham Aliyev on Saturday to inaugurate a dam. Raisi had pledged to visit each of Iran’s 30 provinces at least once a year, and regularly traveled around the country. Reports of a “crash landing” began circulating on Sunday afternoon, with Iranian state media citing Interior Minister Ahmad Vahidi. According to IRNA news agency, the weather was foggy in the area where the presidential helicopter is believed to have gone down. Raisi was traveling in a US-made Bell 212. Low visibility and the impassibility of the area made search operations difficult, IRNA wrote.

Before we go all Mossad or CIA on it, keep in mind--there was a strong fog. Same happened to General Lebed, at that time Krasnoyarsk Krai governor, who thought that if he was a big boss that this negates the safety procedures. He made pilots fly, heli caught electric lines in fog, crashed and everybody died. So, keep in mind a possibility of TPTB overruling pilots. If the heli itself (granted old Bell 212 could have suffered malfunction prior to crash) could have been the culprit, Iranian Bell was most likely much older than the last Bell 212s delivered in 1998. We may be looking at Bell 212 from 1980 at best. 44 years for heli it is pushing it, especially the one which is not supported by the US but had to be maintained. Other than that, my condolences to the people of Iran. It is a great loss.