Federal Motor Vehicle Safety Standards No. 121; Air Brake Systems

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This Notice denies a petition by Mr. Wayne Walch of TP Trucking in which the petitioner requested three changes to Federal Motor Vehicle Safety Standard (FMVSS) No. 121, Air brake systems, related to the air compressor operation and low air pressure warning system. After reviewing the petition and the available real world data, the agency has decided to deny it in its entirety because one of the suggested changes is already in the standard, the second would not result in any measurable safety benefit, and the third was, among other things, not described in sufficient detail for the agency to evaluate its function or purpose.