Airbus helicopter owners must paint red marks on tail rotors to spot loose parts

The US aviation regulator wants to update a rule for Airbus EC120B helicopters. Owners would have to add red paint marks to a part of the tail rotor, which would make it easier to see if bolts are coming loose.

Helicopter tail rotors are critical for flight control, and loose parts can lead to catastrophic failures. This small change means maintenance crews can spot a problem before it becomes a disaster, shifting from complex inspections to a simple visual check. It's a classic example of how a tiny, low-cost modification can prevent high-consequence events.