1991 AGN JAN 03 I14 - Laserfiche WebLink

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operations such as changing filters, changing oil, and makin g periodic adjustments as required for various components. The ke wor Y d is schedule. The schedule for preventive maintenance operations could be based on t calendar, it could be based on miles traveled, or it could be ba other measurable ,� he Period such as time or on an hour meter, sed on some oil in a large engine might.be changed every three months For example, might be changed every 20,000 miles (calendar -based); it every 500 hours (clock -based). Theremisenoerequirement it might changed maintenance operation be that any particular performed on a specific basis (except for certain required inspections for certain- vehicle types, chapters).,. What is required is that the maintenanceeoflthe svehicl later this requirement be performed on a scheduled basis, that the scheduleucalls to for inspections frequently enough to detect developing defects calls become serious, that the schedule is actually followed, before they OBJECTIVES OF_ p, R_gyIVE HAIENANCE One objective of a true preventive maintenance program to equipment failure by maintaining a consY become tant awareness ofsthe current of the vehicle and by correcting developing defects before the condition serious. Maintaining that awareness requires frequent, scheduled inspections. The inspections should be thorough, and if roerly will not be easy work. For this reason, this task should pbepassi performed, conscientious and careful mechanic, assigned to a A second important objective of is to cause all maintenance to take place by int_ent,� andvtomel minateeall unscheduled maintenance to the maximum extent possible. objective lies in the maximum reduction of unscheduledeasuroruunpsuccess lanned for this maintenance because these events are often the result of breakdowns allowed to occur through inattention. owns which were A_third objective of preventive maintenance is to control when a maintenance activity :is to take place. Tns Pction nd where the maintenance, lubrication, and repair activities are easier, more costpeffective and efficiently performed in a regular maintenance shop than atin a groadside more remote area in the middle of the night. Repair efforts also disrupt the de transportation business far less when hurriedly performed in response to a breakd wed according to plan than when Achieving these three preventive maintenance objectives makes sense. The public safety reasons, however, good business more to do with highway safety and convenience less to do with economics and A case could be made, however, that it costs taxpayers money to have their highway safetyagencies respond to traffic tie-ups caused by a truck a bus which has broken crashed) in the middle up a congested roadway. an down (or Y- Tate. main reasonbehind the 4 2-3 HPG 84.6 i i; i