squib66 said: However it would be good if the words 'extremely remote' were taken out of the rule.
It might not be obvious to ppruners, but every new helicopter takes use of that phrase for gear box design and approval in many ways. Erase that rule, and all helos will undergo major new design efforts.
That is because the same FAR/JAR paragraph is used to cover the tail and intermediate gear boxes, which are qualified by showing that they "cannot leak" and the housings are highly reliable structure.