SST Is Said to Face Critical Budget Cut
Pros Nixon's fiscal 71 budget expected to cut Adm's earlier spending plans for program and force another, possibly critical delay in production of 2 prototype craft, program advocates oppose further cuts, holding it would be dangerous to let Brit and French build second generation of supersonic craft before an Amer model enters race; FAA Admr Shaffer, despite secrecy surrounding amt Nixon will ask in budget, says request will be 'closer to $300-million than $200-million'; any cut below $314-million seen postponing completion of prototypes until '73

