Jet Noise: Senate Passes Easier Rules
Sen, 78-15, approves amendment offered by Sen Theodore F Stevens to airliner noise-abatement bill, that would exempt all 2-jet and 3-jet craft from noise standards; present rules require airlines to make 2-jet and 3-jet craft quieter by Jan '83 by refitting or replacement; carriers have until Jan '85 to do same with 4-jet craft; FAA, EPA and spokesmen for airport operators complain bill would exempt carriers from taking steps to quiet 75% of current fleets; hold new legis would undercut those carriers who have already acted to comply with standards; Stevens por (M)