From memory I seem to recall that the 310 antiskid system is like the 300B4 with the nosewheel speed being used as a reference for main wheel braking/touchdown protection & antiskid protection.. Does anyone have any info on whether nosewheels will hydroplane on a contaminated runway?, thus deactivating normal & alternate braking? the crew would have to select manual reversion which may have been quiet a way down the runway when they realized this & in that mode they have no antiskid protection anyway.
The other more extreme possibility which is very rare possibility is a dual hydraluic failure after touchdown. In this scenario no braking or steering fuctions would be availible to the crew. Hopefully the CVR & FDR are in good enough condition to be usable.