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Communication Mediums for Signal, ITS, and Freeway Surveillance Systems Final Report (1996) / Chapter Skim
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A.4.3 Maintenance Personnel Staffing
Pages 453-460

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From page 453...
... ll it's maintenance manual outlines methods to estimate maintenance staffing levels for signal systems based on experience with fielded systems. This discussion win review ITS's methods and subsequent discussions win incorporate He concepts into life cycle cost estimating methods for ITS communication systems employing modem technology.
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From page 454...
... cn ao ~ ~ \ ·_ _ m~ ~ ~ .= \ '` \ Q.= - ~ ~ (L)
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From page 455...
... YRSHRS04.E96 0.0100 0.0050 2.0000 0.5000 0.5000 2.0000 Element A Element B 150.0000 125.0000 0.0067 0.0080 0.5000 2.0000 1.0000 1.0000 0.0150 1.5000 0.6667 Composite Lower 68.1818 0.0147 0.7727 1.2941 Parallel Composite Failure MTBF(hr/fail) 2318.18 F(fail/hr)
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From page 456...
... ll ll c, ll i: ~ Jo In o or s x LLJ it .
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From page 457...
... .. Hours/day Days/week Weeks/year Hours/year Person years 8 5 52.14 2086 1.28 24 7 52.14 8760 5.38 Assuming no over more relevant historical information is available, Me ITS manual recommends Me following general allocation of maintenance time requirements per intersection for signal systems: Preventive Maintenance70% 36 hours Response Maintenance25% 13 hours Design Modification5% ~ hours Totals 100% 52 hours per ~ntersechon/controller The hours are representative of survey data for average signal system maintenance requirements based on information from a cross section of junsdictions.
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From page 458...
... Significantly exceeds Apical reports from this dine penod which are typically in Me 5 10,000 hour MIFF range 3. Average over aB components 4.
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From page 459...
... FIR is affected by many factors: Number and locationfs) of maintenance shops; Number and location of technicians; Maintenance staff availability: 24-hour, 7-day; 8-hour, 5-day; etc.; Technician travel; Availability of appropriate tools, test equipment, etc.; Time require to troubleshoot and identify cause of failure; Spaling strategy on maintenance vehicle; organizabonai inventories and locations, and suppliers; Time required to obtain replacement parts from spares inventory or suppliers; Time required to replace failed parties)
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From page 460...
... Staffing requirements can be calculated as: Number maintenance staff = Yearly hours 1629 hr/person As an example, Me manpower estimate to maintain controllers only, in a representative signal system, is presented in Table A.4.3-5. \ Table A.4.3~5 Maintenance Staffing Estimate for Controllers Number of Controllers | 1 1 1 Preventive Maintenance Time Interval (TI)
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Key Terms

  • preventive maintenance
  • yearly hours
  • maintenance staffing
  • response maintenance
  • maintenance time

  • maintenance organization
  • maintenance hours
  • spares inventory
  • time requirements
  • field verification

  • establish spares
  • modem technology
  • organizabonai inventories
  • skill requirements
  • failed parties

  • yearly preventive
  • win review
  • typically involve
  • maintenance aches
  • reliably estimated

  • subsequent discussions
  • outlines methods
  • maintenance vehicle
  • spaling strategy
  • considering fielded

  • hour miff
  • maintenance mtbf
  • maintenance manual
  • aches typically
  • resoonse maintenance


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