*3.1.4 Critical maintenance task (CMT) list and regular maintenance task list*

The process to generate critical roadmaps and regular route sheets for maintenance tasks begins in accordance with asset ranking, that is, the severity of the impact of their failures within the production process. The hierarchical level of assets is defined in the generation stage of the baseline.

Roadmaps, by definition, are documents designed to direct maintenance activities by minimizing the level of human error on the part of operators. They were developed by the aeronautical industry in the 1970s within the framework of technical recommendations pertaining to reliability in maintenance [46]. Roadmaps

**19**

**Table 2.**

*Maintenance and Asset Life Cycle for Reliability Systems DOI: http://dx.doi.org/10.5772/intechopen.85845*

failures based on RCM studies [49].

**3.2 Case study**

**Error location in flowchart**

Engineering judgment

*Potential errors in the inspection process.*

Maintenance card system (E5)

(E4)

**Definition**

a location Inspection (E2) Not seeing a defect when one exists

or not

Noting defect (E6) The error is noted incorrectly or not noted at all

Scheduling (E1) Wrong execution of either of the two tasks: identify next inspection or move to

An error in deciding whether the area in which a defect is found is significant

Arises because the work cards themselves may not be used to note defects on

Inspection (E3) If human induced, due to either forgetting to cover area, covering area inadequately, or a scheduling error

the hangar door immediately as they are found

teeing high reliability in complex and high-risk systems.

the reduction of error can be concentrated as shown in the **Table 2**.

direct maintenance activities from preventive to predictive and even corrective, with the aim of reducing human error during their development and, thus, guaran-

Implementation of roadmaps allows the development of technical benefits in integral maintenance management. They detail the activities, procedures, tools, and spare parts necessary for the execution of each of the activities scheduled in stated preventive maintenance plans and are based on the technical specifications recommended by the manufacturer [47]. Based on the work of the aeronautical industry,

The maintenance tasks can be classified in the main groups: corrective, preventive, and predictive (condition-based and condition monitoring) [48]. Souza and Guevara present two tables that can help determine the main causes of mechanical

The proposed model was implemented at an organization with 54 years of experience in providing home cleaning services and complementary activities in the city of Medellin and five nearby municipalities. The company has 767,668 users, among the residential, commercial, and industrial sectors. Service delivery in the residential sector is carried out twice per week (Monday–Thursday, Tuesday–Friday, Wednesday–Saturday), for a total of 104 services per year. Frequencies in the commercial and industrial sector may vary between 1 to 7 times per week, depending on the waste generation of each subscriber, which leads to a total of 104 to 365 collections per year. The main activities of the organization are collection and transport of solid wastes, sweeping and cleaning of roads and public areas, grass cutting and pruning of trees in public areas, and washing off roads and public areas. The range of services extends to the collection of special wastes, among which are waste generated at events and mass shows, points of sale in public areas, dead animals, construction and demolition wastes (C&D), hospital wastes, mattresses, vegetables, furniture, carpentry wastes, and collection (dismantling and installation) of public baskets. As part of the solid waste collection strategy, the organization has a diversity of vehicles with different dimensions in order to access areas with adverse geographic conditions. To allow great maneuverability in limited-access roads, the company has model 2009 Kenworth vehicles with only two axes (simple) and smaller vehicles such as NPR model 1998 and 2012. In general, to meet the demand, the organization

### *Maintenance and Asset Life Cycle for Reliability Systems DOI: http://dx.doi.org/10.5772/intechopen.85845*

direct maintenance activities from preventive to predictive and even corrective, with the aim of reducing human error during their development and, thus, guaranteeing high reliability in complex and high-risk systems.

Implementation of roadmaps allows the development of technical benefits in integral maintenance management. They detail the activities, procedures, tools, and spare parts necessary for the execution of each of the activities scheduled in stated preventive maintenance plans and are based on the technical specifications recommended by the manufacturer [47]. Based on the work of the aeronautical industry, the reduction of error can be concentrated as shown in the **Table 2**.

The maintenance tasks can be classified in the main groups: corrective, preventive, and predictive (condition-based and condition monitoring) [48]. Souza and Guevara present two tables that can help determine the main causes of mechanical failures based on RCM studies [49].
