Six Arc7 carriers face binary maintenance fork

The Arc7 maintenance ban creates a non-substitutable chokepoint for three interlocking structural reasons.

First, Arc7 ice-class certification is technically specific. The designation requires testing of hull steel behaviour at -52°C, propulsion performance in 2.1-metre consolidated ice, and rescue system functionality in Arctic conditions. These tests cannot be conducted in tropical yards; they require ice-class testing facilities in northern Norway or Finland, both now barred under the 20th package, or the equivalent in Russia, which lacks the modern testing infrastructure.

Second, Arctic sea ice returns to the Northern Sea Route by mid-September, setting a hard calendar deadline for any vessel that needs dry-dock time. Vessels operating after that date without current ice-class certification face flag-state detention risk and lose the ability to navigate the route that Yamal LNG depends on for cargo export.

Third, the EU deliberately scoped the ban to maintenance only, excluding full maritime services . That partial scope was a political compromise within the Council but it does not reduce the operational consequence: the maintenance ban is the binding constraint, and the services carve-out does not help vessels that cannot get into a yard.