There is no conceivable airworthiness link to that.
Read JSP 553 and Def Stan 00-970.
As for Chinook, the Chief of Defence Procurement (4 Star) openly admitted to the Public Accounts Committee that one of the core, mandated components of airworthiness was not implemented. By definition, the RTS was flawed, as there was no audit trail (also a mandated requirement).
You will, I think, understand that these committees give advance notice of such questions. However, the members don't necessarily understand the question, so when CDP made his admission they didn't follow up. Not that he would have been in a position to answer more detailed questions, as junior staffs had been actively prevented from briefing him. "We can't have you telling him the truth".
It must be obvious to all that such a staggering admission was actually damage limitation. Take the hit on that, hope they don't go deeper (and hope it goes unnoticed by the likes of the Mull Group). I think Haddon-Cave will, but too late for some.