Westland 30: TC revoked
From Aviation International News.
In a highly unusual move, the FAA revoked the type certificate for the UK-built Westland 30 helicopters, after Westland helicopter returned the TC for the defunct line to Britain's Civil Aviation Authority.
The CAA susequently asked the FAA to revoke it's TC for the aircraft. There were 9 examples of the this helicopter listed in the US registry, but they had been purchased by Westland and were reportedly in the process of being destroyed at press time.
The Westland 30 gained some limited success in the difficult scheduled helicopter airline sector, but accidents and various mechanical woes soon caused operators to lose confidence in the aircraft.