FAA bans a risky weight system on Bell helicopters after weights escaped and hit tail rotors

The US aviation regulator is permanently prohibiting a specific ballast weight system on certain Bell Model 505 helicopters after the hinge assembly failed, allowing weights to escape and strike the tail rotor. Pilots of these helicopters can no longer use this weight adjustment method at all.

A mechanical failure turned into a safety hazard that could cause a crash. The fix is blunt: remove the capability entirely rather than try to repair it. This tells you something about the design — the ballast system was optional, the risk was real enough to warrant an emergency directive, and the safest path was elimination rather than engineering repair.