Description / Abstract:
1. Scope--This SAE Recommended Practice establishes the test procedure,
environment, and instrumentation for determining the maximum exterior
sound level of highway motor trucks and truck tractors over 4540 kg
gross vehicle weight rating (GVWR) with governed engines under
stationary vehicle conditions. The basic procedure involves a full
throttle engine acceleration and a closed throttle deceleration with
the engine inertia as the load.