Authority Industries Maintenance Glossary of Terms

The maintenance industry spans commercial, residential, and industrial operations, each carrying its own regulatory expectations, credentialing standards, and contractual frameworks. This glossary defines the core terminology used across the Authority Industries maintenance network — from preventive scheduling concepts to licensing classifications and service-category distinctions. Understanding these terms supports accurate provider evaluation, compliance assessment, and informed decision-making when navigating maintenance provider credentialing requirements or comparing service segments.

Definition and scope

A maintenance glossary, in the context of an authority directory network, defines the standardized vocabulary used to classify, evaluate, and describe providers, services, obligations, and industry standards across the full spectrum of facility care. The scope here encompasses terminology relevant to commercial, residential, and industrial maintenance industry segments — including HVAC, electrical, plumbing, roofing, janitorial, landscaping, pest control, and predictive technology applications.

Terms in this glossary are drawn from public regulatory bodies, standards organizations, and industry associations including the International Facility Management Association (IFMA), the Occupational Safety and Health Administration (OSHA), the National Institute of Standards and Technology (NIST), and the International Maintenance Institute (IMI). Where definitions vary across jurisdictions or trade bodies, the most widely adopted usage in US professional practice is presented.

Scope boundary: This glossary covers operational, regulatory, and classification terminology. It does not address proprietary software feature sets or brand-specific service definitions.

How it works

Glossary terms are organized by functional domain and defined according to their operational meaning within a structured maintenance framework. Each entry identifies the term, its primary domain (e.g., preventive maintenance, compliance, credentialing), and any critical distinctions from adjacent terminology.

Core structural breakdown of glossary entry types:

  1. Service-type terms — Definitions describing categories of maintenance activity, such as corrective maintenance, preventive maintenance, predictive maintenance, and deferred maintenance.
  2. Regulatory and compliance terms — Vocabulary tied to licensing, permitting, insurance, and OSHA or EPA obligations.
  3. Credentialing and certification terms — Titles, designations, and accreditation standards issued by bodies such as IFMA, NATE (North American Technician Excellence), or NICET (National Institute for Certification in Engineering Technologies).
  4. Contractual and operational terms — Language governing service-level agreements (SLAs), scope of work (SOW), mean time to repair (MTTR), and asset lifecycle management.
  5. Technology and data terms — Definitions related to computerized maintenance management systems (CMMS), condition monitoring, and AI-driven maintenance industry classifications.

Common scenarios

Preventive vs. Corrective Maintenance
Preventive maintenance (PM) is scheduled work performed to reduce the probability of failure before it occurs — typically governed by manufacturer intervals, regulatory minimums, or asset age. Corrective maintenance (CM) is reactive work performed after a failure or deficiency is identified. The preventive maintenance industry reference details PM scheduling frameworks in depth. In facility budgeting, PM programs typically reduce unplanned downtime by addressing failure modes proactively, whereas CM incurs variable emergency labor and parts costs.

Predictive Maintenance (PdM)
Predictive maintenance uses condition-monitoring data — vibration analysis, thermal imaging, oil sampling — to anticipate failure before a defined threshold is reached. PdM differs from PM in that service intervals are determined by actual equipment condition, not fixed time periods. The predictive maintenance industry reference covers sensor-based and AI-assisted approaches in this domain.

Mean Time to Repair (MTTR)
MTTR is the average elapsed time from failure detection to full restoration of function. Facility operators use MTTR as a key performance indicator (KPI) when evaluating contractor responsiveness under SLA terms. A facility with a contractual MTTR ceiling of 4 hours for critical HVAC failures, for example, would benchmark contractors against that threshold during provider selection.

Deferred Maintenance
Deferred maintenance refers to work that has been identified as necessary but postponed, typically due to budget constraints. APPA (the Association of Physical Plant Administrators, now APPA: Leadership in Educational Facilities) has documented deferred maintenance as a persistent cost driver across educational and government facilities, where backlogs compound at an estimated 2 to 4 percent of asset replacement value annually (APPA, Postsecondary Education Facilities Inventory and Classification Manual).

Contractor vs. In-House Maintenance
The distinction between outsourced contractors and in-house maintenance staff is a classification decision with compliance, cost, and liability implications. The page on maintenance contractor vs. in-house authority distinction addresses this in full. In brief: contractors hold independent licensing and insurance obligations, while in-house technicians operate under the employer's general liability and workers' compensation coverage.

Decision boundaries

Applying glossary terminology correctly requires understanding where definitions overlap and where hard boundaries apply.

PM vs. PdM boundary: Work scheduled on a fixed interval (monthly, quarterly, annually) is PM regardless of whether monitoring data suggests the equipment is healthy. Work triggered by a sensor threshold or diagnostic reading is PdM. The distinction affects how work orders are coded in a CMMS and how costs are reported against asset records.

Licensing scope: The term "licensed contractor" applies only when a provider holds a state-issued license for the specific trade being performed. General maintenance technicians performing non-licensed tasks (e.g., filter replacement, painting, minor carpentry) do not carry trade licenses. National maintenance compliance and licensing outlines which trades require licensure across US jurisdictions.

Certification vs. Licensure: Certification is a voluntary credential issued by a professional body (e.g., NATE certification for HVAC technicians). Licensure is a legally mandatory authorization issued by a state or local authority. Holding a certification does not satisfy a licensure requirement, and vice versa. The maintenance industry certifications and associations page details active credentialing bodies and their scope.

SLA vs. SOW: A service-level agreement (SLA) defines performance standards and response time obligations. A scope of work (SOW) defines specific tasks to be completed. Both documents govern contractor performance, but an SLA violation triggers a contractual remedy, while a SOW gap may constitute an incomplete delivery.

References

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