"It's not in the contract, they haven't paid for it, take it out attitude"
When Bristow packed up their USA operations their S76s were shipped to the UK. I would pick them up from some Ro Ro in the UK or Europe and ferry them to Redhill to be 'Anglicised'. This involved replacing the Omega AND the DME with Decca. The DME was, apparently, a bind to remove but it was neccessary to avoid have to fix it if it went wrong.
Six months later Norway stipulated that DME had to be carried by aircraft nominating a Norwegian diversion.