Rosaviatsiya has issued an airworthiness directive mandating an urgent inspection of the entire fleet of Ansat helicopters and their modifications, including ambulance versions. The reason is the discovery of corrosion damage to the tail shaft, which could lead to its failure in flight.
The directive was prompted by an investigation into an incident that occurred on June 20 with an Ansat-U helicopter used in state aviation. According to preliminary data, the machine's tail shaft failed due to manufacturing defects. Despite the seriousness of the situation, information about the incident was not communicated to operators and was not covered in the media.
Since the shafts on civilian and state aviation Ansats have an identical design, the Kazan Helicopter Plant initiated unscheduled inspections of all machines. To this end, the company prepared a technical solution with an inspection and additional control map, based on which Rosaviatsiya issued the directive.
The document prescribes that within the next ten flight hours, a visual inspection of the tail shafts installed on helicopters and in storage must be carried out. If blistering of the paintwork or traces of corrosion are detected, the parts must be immediately removed from service and sent to Reduktor-PM for pipe replacement. In addition, regardless of their condition, all shafts of a certain series that have previously undergone major repairs without pipe replacement are subject to repeated repairs.
The directive also introduces mandatory additional visual inspection of tail shafts every 50–60 flight hours or every three months.
According to preliminary information from industry sources, operators are already finding defects in the form of coating blisters and clusters of pinpoint damage on a number of helicopters during inspections.
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