NTSB Issues Safety Recommendation Regarding Bell Helicopter Tail Rotor Gearbox Failures

The National Transportation Safety Board has issued a safety recommendation directed at the Federal Aviation Administration concerning Bell Helicopter Textron UH-1 and TH-1 series helicopters. These aircraft are frequently utilized in repeated heavy lift operations, which present specific operational challenges. The recommendation highlights accident histories that have resulted from the failure of the tail rotor drive shaft gearbox. To mitigate these risks, the NTSB urges the Federal Aviation Administration to notify operators of these incidents. Furthermore, the Board advises that operators should caution their pilots about the dangers associated with exceeding the torque limit on the engine. This guidance aims to improve safety awareness among those conducting heavy lift missions with these specific helicopter models.