lect22 - TRANSIT MAINTENANCE Outline 1 2 3 4 5 Objectives...

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Nigel H.M. Wilson 1.259J/11.542J/ESD/227J, Fall 2006 1 Lecture 22 TRANSIT MAINTENANCE Outline 1. Objectives of Maintenance Programs 2. Program Elements 3. Framework for Program Design 4. Maintenance Indicators 5. MBTA Experience
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Nigel H.M. Wilson 1.259J/11.542J/ESD/227J, Fall 2006 2 Lecture 22 Objectives of Maintenance Programs Safety -- paramount, must avoid unsafe operations if at all possible -- key question is, are there identifiable precursors to safety failures? Supply -- very common measure of maintenance effectiveness is % of scheduled pullouts met -- a tension between this and reliability on the road Reliability -- mean distance between failures a universal measure of maintenance effectiveness -- inconsistent definitions of "failures" makes comparisons hard •C
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Nigel H.M. Wilson 1.259J/11.542J/ESD/227J, Fall 2006 3 Lecture 22 Program Elements A.Scheduled A.1 Daily Servicing -- fueling, fluid checks, minor maintenance -- following up on operator defect reports -- may account for 20% of total maintenance effort -- early problem identification opportunity -- vehicle diagnostics and computer-based monitoring of performance Maintenance activities can be classified as scheduled or unscheduled
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Nigel H.M. Wilson 1.259J/11.542J/ESD/227J, Fall 2006 4 Lecture 22 Program Elements A.Scheduled, cont'd A.2 Inspections -- scheduled check on parts or systems to detect emerging problems before they result in in-service failure -- typical inspection program may have 2-5 inspection intervals ranging from 1,000 to 24,000 miles -- package each part or system into specific inspection interval to take advantage of scale economies -- inspections typically done in off-peak or overnight periods
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Nigel H.M. Wilson 1.259J/11.542J/ESD/227J, Fall 2006 5 Lecture 22 Program Elements A. Scheduled, cont'd A.3 Preventive Parts Replacement -- replace certain parts before failure to avoid high failure costs -- integrated into an inspection cycle -- replacement can be based on mileage (automatic) or on condition at inspection -- examples are rebuilding motors or transmissions
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Nigel H.M. Wilson
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This note was uploaded on 12/06/2011 for the course ESD 1.259j taught by Professor Nigelwilson during the Fall '06 term at MIT.

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lect22 - TRANSIT MAINTENANCE Outline 1 2 3 4 5 Objectives...

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