Unless such failures are extremely remote
I wonder what is the process for a manufacturer to prove to the certification authority that such an event will be extremely remote? Surely its only really possible to get an idea of these things after much experience with a new type?
No manufacturer (hopefully) builds a product that they know is going to be failure-prone. Its the un-anticipated issues that cause the problems. Therefore surely this alleviation from the main body of this para in JAR/FAR29 is just a cop-out? Its no wonder helicopters are so prone to life-endangering serious mechanical failure when the certification rules are so sloppy!
HC