84 Maintenance Noise Shielding and Insulation Devices Make sure sound shielding and insulating devices are intact. Inspect components for damage. Primary system components requiring noise related inspection include the hood, engine compartment insulating materials (including hood insulation, bulkhead insulation, doghouse insulation, etc.) splash shields, cab skirts, fender shields, and body panels. Inspect all related fasteners, brackets, and clamps for damage and tightness. Acts that constitute tampering with the Noise Shielding and Insulation Devices: Removing or rendering inoperative the engine and/or transmission noise deadening panels, shields or insulating materials.
Removing or rendering inoperative the cab-tunnel or hood noise insulating materials. Removing or rendering inoperative any vehicle body mounted sound insulation components and/or shields (cab or fender shields, skirts, wheel housing splash shields, etc.).