Helicopter nuts must be checked for cracks after factory installed them wrong
What happened
The US aviation regulator is ordering repetitive inspections for certain nuts on five models of Leonardo S.p.A. helicopters. This is because the factory instructions specified the wrong torque values for these nuts during installation, which could lead to cracks or slippage.
Why it matters
A small error in a factory manual can have big consequences for safety. This rule means helicopter operators must now regularly check a specific part that was likely installed incorrectly at the factory. It shifts the burden of detecting a manufacturing defect to the operators through ongoing maintenance.
The signal
Watch for any reports of cracks or failures in these specific swashplate nuts on Leonardo helicopters, which would indicate how widespread the original installation error was.