Horns, Backup Alarms, and Automatic Warning Devices 56.14132
Horns and backup alarms (a) Manually-operated horns or other audible warning devices provided on self-propelled mobile equipment as a safety feature shall be maintained in functional condition. (b)(1) When the operator has an obstructed view to the rear, self-propelled mobile equipment shall have (b)(1)(i) An automatic reverse-activated signal alarm; (b)(1)(ii) A wheel-mounted bell alarm which sounds at least once for each three feet of reverse movement; (b)(1)(iii) A discriminating backup alarm that covers the area of obstructed view; or (b)(1)(iv) An observer to signal when it is safe to back up. (b)(2) Alarms shall be audible above the surrounding noise level. (b)(3) An automatic reverse-activated strobe light may be used at night in lieu of an audible reverse alarm. (c) This standard does not apply to rail equipment. MSHA policy can be found here: 56/57.14132 77.410 Mobile equipment; automatic warning devices (a) Mobile equipment such as front-end loaders, forklifts, tractors, graders, and trucks, except pickup trucks with an unobstructed rear view, shall be equipped with a warning device that-- (1) Gives an audible alarm when the equipment is put in reverse; or (2) Uses infrared light, ultrasonic waves, radar, or other effective devices to detect objects or persons at the rear of the equipment, and sounds an audible alarm when a person or object is detected. This type of discriminating warning device shall-- (a)(2)(i) Have a sensing area of a sufficient size that would allow endangered persons adequate time to get out of the danger zone. (a)(2)(ii) Give audible and visual alarms inside the operator's compartment and a audible alarm outside of the operator's compartment when a person or object is detected in the sensing area; and (a)(2)(iii) When the equipment is put in reverse, activate and give a one-time audible and visual alarm inside the operator's compartment and a one-time audible alarm outside the operator's compartment. (b) Alarms shall be audible above the surrounding noise levels. (c) Warning devices shall be maintained in functional condition. (d) An automatic reverse-activated strobe light may be substituted for an audible alarm when mobile equipment is operated at night. MSHA policy can be
found here: 77.410 77.1605(d) Loading and haulage equipment; installations There is no MSHA policy for this standard. These standards apply to surface (metal and nonmetal and coal) and underground (coal) self-propelled mobile equipment. They do not apply to rail equipment.
Issues to Consider in Determining Compliance:• Was the self-propelled equipment operated on the surface area of a mine? • Was a manually operated horn provided on this equipment? • Does the surface mobile equipment have an obstructed view to the rear (metal and nonmetal)? » If yes, was one of the following provided: • Automatic backup alarm; or • Wheel mounted bell alarm (metal and nonmetal); or • Discriminating back-up alarm; or • An observer • Does mobile equipment such as front-end loaders, forklifts, tractors, graders, and trucks, except pickup trucks with an unobstructed rear view, have a warning device that (coal): » Gives an audible alarm when the equipment is put in reverse; or » Uses infrared light, ultrasonic waves, radar, or other effective devices to detect objects or persons at the rear of the equipment and sounds an audible alarm when a person or object is detected. v Does this type of discriminating warning device: » Have a sensing area of a sufficient size that would allow endangered persons adequate time to get out of the danger zone? » Give audible and visual alarms inside the operator's compartment and an audible alarm outside of the operator's compartment when a person or object is detected in the sensing area? » Activate and give a one-time audible and visual alarm inside the operator's compartment and a one-time audible alarm outside the operator's compartment when the equipment is put in reverse? • Can the horn and backup alarm be heard over the surrounding noise? • Was the self-propelled mobile equipment operated at night? » If yes, does the equipment have a functional reverse-activated strobe light in lieu of an audible backup alarm of the type described above? Other issues
covered by related standards: • Were personnel in the area warned prior to moving self-propelled mobile equipment or starting crushers? (56.14200 or 57.14200 - warnings prior to starting or moving equipment or crushers) (77.1607(bb) - audible or visible warning system for conveyors not visible from the starting switch) |