I think a reasonably hypothetical question Ned.
All of the helicopter providers undergo stringent auditing to win and maintain these contracts.
If all the boxes are ticked then the companies are operating as per the manufacturers specs and recommendations, also those of the relevant regulatory authority.
The boot may well be on the other foot in the event of an unexplained accident and if the contract be cancelled, that "Breach of contract" could well come into play for the provider.
The oil companies and helicopter providers 'Assure' themselves with that established audit protocol, but as Paco points out the "Insurance" is another thing entirely, for hull and third party.