SIST EN 17666:2023
(Main)Maintenance - Maintenance engineering - Requirements
Maintenance - Maintenance engineering - Requirements
This document describes the generic principles, criteria and contents of maintenance engineering. This includes guidance on methods and techniques which are used to sustain the required functions of items at any stage of their life cycle.
This document gives guidance on how maintenance engineering can contribute to assure the required integrity, safety, reliability and maintainability to achieve a sustainable balance between performance, risk and costs.
This document refers to standards that further describe detailed methods and techniques.
Instandhaltung - Instandhaltungsengineering - Anforderungen
Dieses Dokument legt die Disziplin des Instandhaltungsengineerings über den gesamten Lebenszyklus fest.
Dieses Dokument enthält Anleitungen dazu, wie das Instandhaltungsengineering zur Sicherstellung der geforderten Funktionssicherheit beitragen kann, um einen nachhaltigen Ausgleich zwischen Leistung, Risiko und Kosten zu erreichen.
Dieses Dokument verweist auf Normen, in denen detaillierte Methoden und Techniken ausführlicher beschrieben werden.
Dieses Dokument enthält keine Anleitungen dazu, wie Instandhaltungsengineering-Systeme und Infrastruktur zu erstellen sind, noch enthält es Anleitungen für die Instandhaltung von Software.
ANMERKUNG 1 Die Instandhaltungstätigkeiten für die Softwarekomponenten eines Objekts werden in ISO/IEC/IEEE 14764 [54] behandelt.
ANMERKUNG 2 Der allgemeine Instandhaltungsprozess wird in EN 17007 [10] behandelt.
Maintenance - Ingénierie de maintenance - Exigences
Le présent document spécifie la discipline d’ingénierie de maintenance tout au long du cycle de vie.
Il fournit également des recommandations sur la façon dont l’ingénierie de maintenance peut contribuer à assurer la sûreté de fonctionnement requise afin d’établir un équilibre durable entre performances, risques et coûts.
Le présent document se réfère à des normes qui décrivent plus en détail les méthodes et techniques concernées.
Il ne fournit aucune recommandation pour la mise en place de systèmes et d’infrastructure pour l’ingénierie de maintenance, ni aucune recommandation sur la maintenance des logiciels.
NOTE 1 Pour les composants logiciels d’un bien, les activités de maintenance sont traitées dans l’ISO/IEC/IEEE 14764 [54].
NOTE 2 Le processus global de maintenance est couvert par l’EN 17007 [10].
Vzdrževanje - Vzdrževalni inženiring - Zahteve
Ta dokument opisuje splošna načela, merila in vsebino vzdrževalnega inženiringa. To vključuje smernice za metode in tehnike, ki se uporabljajo za vzdrževanje zahtevanih funkcij elementov v kateri koli fazi njihovega življenjskega cikla.
Ta dokument podaja smernice o tem, kako lahko vzdrževalni inženiring prispeva k zagotavljanju zahtevane celovitosti, varnosti, zanesljivosti in vzdrževanja, da se doseže trajnostno ravnovesje med zmogljivostjo, tveganjem in stroški.
Ta dokument se navezuje na standarde, ki podrobneje opisujejo metode in tehnike.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 17666:2023
01-februar-2023
Vzdrževanje - Vzdrževalni inženiring - Zahteve
Maintenance - Maintenance engineering - Requirements
Instandhaltung - Instandhaltungsengineering - Anforderungen
Maintenance - Ingénierie de maintenance - Exigences
Ta slovenski standard je istoveten z: EN 17666:2022
ICS:
03.080.10 Vzdrževalne storitve. Maintenance services.
Upravljanje objektov Facilities management
SIST EN 17666:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 17666:2023
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SIST EN 17666:2023
EN 17666
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 03.080.10
English Version
Maintenance - Maintenance engineering - Requirements
Maintenance - Ingénierie de maintenance - Exigences Instandhaltung - Instandhaltungsengineering -
Anforderungen
This European Standard was approved by CEN on 16 October 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17666:2022 E
worldwide for CEN national Members.
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SIST EN 17666:2023
EN 17666:2022 (E)
Contents Page
European foreword . 4
0 Introduction . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols and abbreviations . 13
5 Maintenance engineering . 13
6 Maintenance engineering activities in the life cycle . 14
6.1 General . 14
6.2 Concept stage . 17
6.2.1 General . 17
6.2.2 Aims for concept stage . 17
6.2.3 Maintenance engineering in the concept stage . 18
6.3 Development stage . 20
6.3.1 General . 20
6.3.2 Aims for preliminary design substage . 20
6.3.3 Maintenance engineering in preliminary design substage . 20
6.3.4 Aims for detailed design substage . 22
6.3.5 Maintenance engineering in the detailed design substage . 22
6.4 Realization stage . 23
6.4.1 General . 23
6.4.2 Aims for realization stage . 23
6.4.3 Maintenance engineering in the realization stage . 23
6.5 Utilization stage . 24
6.5.1 General . 24
6.5.2 Aims for the utilization stage . 25
6.5.3 Report the review results . 25
6.5.4 Report technical data and assess technical condition . 25
6.5.5 Assess the need for improvements . 25
6.5.6 Maintenance engineering in the utilization stage . 26
6.6 Disposal / transition stage . 27
6.6.1 General . 27
6.6.2 Aims for disposal and transition stage . 27
6.6.3 Maintenance engineering in the disposal and transition stage . 27
7 Digitalization in maintenance engineering . 28
7.1 Introduction . 28
7.2 Digitalization requirements from maintenance engineering during the life cycle . 29
Annex A (informative) Relationship between maintenance engineering and integrated
logistic support (ILS) . 31
A.1 ILS overview . 31
A.1.1 General . 31
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A.1.2 ILS objectives . 31
A.1.3 Elements of ILS. 31
A.1.4 Logistic support analysis (LSA) . 32
A.2 Relationship between maintenance engineering and ILS. 32
Annex B (informative) Techniques, analyses and practices applicable to maintenance
engineering . 33
B.1 General . 33
B.2 Techniques, analyses and practices applicable to maintenance engineering . 33
Annex C (informative) Maintainability design within maintenance engineering . 39
C.1 General . 39
C.2 Design for maintainability. 39
Annex D (informative) Life cycle stages . 42
Bibliography . 43
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SIST EN 17666:2023
EN 17666:2022 (E)
European foreword
This document (EN 17666:2022) has been prepared by Technical Committee CEN/TC 319
“Maintenance”, the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2022, and conflicting national standards shall be
withdrawn at the latest by May 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
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EN 17666:2022 (E)
0 Introduction
0.1 Scope and benefits of maintenance engineering
Maintenance engineering is a discipline applying competencies, methods, techniques and tools to develop
and support maintenance in order to ensure that an item is able to perform its required functions in a
safe, sustainable and cost-effective manner throughout the life cycle.
The prime aim of maintenance engineering is to contribute to the achievement of overall stakeholder
requirements through optimized and cost-effective maintenance as part of physical asset management.
The benefits of the contributions from maintenance engineering include, but are not limited to:
— achievement of dependability goals by influencing design;
— risk analysis related to maintenance;
— application of sustainability principles;
— achieved required integrity and safety level;
— achieved required performance and technical condition;
— improved life extension decisions;
— improved maintenance support performance;
— reduced environmental footprint by saving energy and raw materials consumption;
— improved competitiveness and output value.
0.2 Use of this document
This document is generic and provides guidance on the methodology to achieve maintenance engineering
aims.
The intended users of this document are personnel involved in design, procurement, construction,
commissioning, operation, improvement, maintenance and disposal/transition or decommissioning of
physical assets. No specific structure or size of organization is assumed so that maintenance engineering
effort should be tailored to suit specific applications and organisational requirements.
This document is based on the maintenance terminology as defined in EN 13306 Maintenance —
Maintenance terminology. Adjustments and additional terminology used, are found in Clause 3.
Clause 5 of this document describes maintenance engineering discipline and its objectives.
Clause 6 of this document describes maintenance engineering activities during the life cycle stages.
Activities are used to express the application of knowledge, skills and tools in maintenance engineering.
The following life cycle stages and substages are used, see 6.1:
1) concept stage with the following substages: feasibility and concept baseline;
2) development stage with the following substages: preliminary design and detailed design;
3) realization stage with the following substages: build and implementation / commissioning;
4) utilization stage with the following substage: operation and maintenance;
5) disposal/transition stage with the following substage: reuse, recycling or disposal.
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NOTE These life cycle stages are harmonized as far as possible and based on what are used in EN 16646 [7]
and IEC 60300 series [see Bibliography]. Disposal and transition are used instead of retirement used in IEC 60300
series. See an overview in Annex D.
While maintenance engineering has the most impact when applied during the concept stage and design
of a physical item, this document is applicable to maintenance engineering in all life cycle stages, and for
different scenarios, for example:
— manufacturer producing one equipment and then maintaining it;
— transfer of property at commissioning to a buyer who will be in charge of maintenance;
— transfer of property at commissioning followed by a warranty period. The seller is responsible during
the warranty and the buyer thereafter;
— maintenance service (sub) contract by the seller to the buyer or to a third party.
Clause 7 of this document describes maintenance engineering and digitalization.
The document also includes informative Annexes A to D with additional guidance.
Processes are defined as set of interrelated or interacting activities that use inputs to deliver an intended
result (3.24). In the context of this document, the term “maintenance engineering activities” is used to
express the application of knowledge, skills and tools to support the processes given in EN 17007 [10].
While EN 17007 describes the processes, this document FprEN 17666 follows the life cycle stages.
0.3 Related standards
This document is part of a group of European maintenance standards published by CEN/TC 319
Maintenance giving requirements and guidance on maintenance, see the committee site on
https://standards.cencenelec.eu/dyn/www/f?p=CEN:105::RESET and Bibliography [2] to [7] and [9] to
[12].
In addition, there are a number of standards published in CEN, ISO and IEC which address maintenance
as part of asset management and dependability view.
The asset management standards in the ISO 55000 series [59 to 61] address the overall requirements for
assets, decision criteria, strategic asset management plan (SAMP) and asset management plan. EN 17485
[12] and EN 16646 [7] create a bridge between these ISO standards and the EN maintenance standards
which determine the requirements for maintenance engineering.
The IEC dependability standards (principally the IEC 60300 series) address the management and
technical activities to produce and / or sustain a dependable item, which is one where there is justified
confidence that it will operate as desired and satisfy agreed stakeholder needs and expectations.
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1 Scope
This document specifies the maintenance engineering discipline throughout the entire life cycle.
This document gives guidance on how maintenance engineering can contribute to the assurance of
required dependability to achieve a sustainable balance between performance, risk and costs.
This document refers to standards that further describe detailed methods and techniques.
This document does not give guidance on how to set up systems and infrastructure for maintenance
engineering nor does it include guidance on software maintenance.
NOTE 1 For software components of an item, the maintenance activities are covered in ISO/IEC/IEEE 14764
[54].
NOTE 2 The overall maintenance process is covered by EN 17007 [10].
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13306, Maintenance — Maintenance terminology
3 Terms and definitions
For the purposes of this document the terms and definitions given in EN 13306 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/
3.1
maintenance
combination of all technical, administrative and managerial actions during the life cycle (3.10) of an item
(3.13) intended to retain it in, or restore it to, a state in which it can perform the required function (3.8)
Note 1 to entry: Technical maintenance actions include observation and analyses of the item state (e.g.
inspection, monitoring, testing, diagnosis, prognosis, etc.) and active maintenance actions (e.g. repair,
refurbishment).
Note 2 to entry: See also the definitions of improvement and modification in EN 13306.
[SOURCE: EN 13306:2017, 2.1]
3.2
maintenance engineering
engineering discipline applying competencies (3.14), methods, techniques and tools to develop and
support maintenance (3.1) in order to assure that an item (3.13) is able to perform its required functions
(3.8) in a safe, sustainable and cost-effective (3.9) manner throughout the life cycle (3.10)
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3.3
maintenance management
all activities of the management that determine the maintenance (3.1) requirements, objectives,
strategies and responsibilities, and implementation of them by such means as maintenance planning,
maintenance control, and the improvement of maintenance activities and economics
[SOURCE: EN 13306:2017, 2.2]
3.4
maintenance plan
structured and documented set of tasks that include the activities, procedures, resources and the time
scale required to carry out maintenance (3.1)
[SOURCE: EN 13306:2017, 2.5]
3.5
maintenance strategy
management method used in order to achieve the maintenance objectives
EXAMPLE Outsourcing of maintenance, allocation of resources, etc.
[SOURCE: EN 13306:2017, 2.4]
3.6
failure management policy
maintenance activities, operational changes, design modifications or other actions in order to mitigate
the consequences of failure
[SOURCE: EN 60300-3-11:2009, 3.1.6]
3.7
operation
combination of all technical, administrative and managerial actions, other than maintenance actions, that
results in the item being in use
Note 1 to entry: Maintenance actions carried out by operators are not included in operation.
Note 2 to entry: In this document, operational and operations are used as synonyms.
[SOURCE: EN 13306:2017, 2.9, modified – Note 2 to entry have been added.]
3.8
required function
function, combination of functions, or a total combination of functions of an item which are considered
necessary to fulfil a given requirement
Note 1 to entry: “Necessary to fulfil a given requirement” may also include asset value preservation.
Note 2 to entry: The given requirement may be expressed or implied and may in some cases be below the original
design specifications.
Note 3 to entry: The required function, by implication, also covers what the item shall not do.
[SOURCE: EN 13306:2017, 2.6]
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3.9
cost-effective
balance of cost, risk (3.26), opportunity and performance taking into account stakeholder objectives
Note 1 to entry: Performance covers quality, short and long term.
3.10
life cycle
series of stages through which an item goes, from its conception to disposal
Note 1 to entry: The stages identified will vary with the application. Reuse and recycle follows disposal.
[SOURCE: EN 13306:2017, 4.18, modified — List of examples of life cycle stages is omitted because
EN 17666 defines the stages given in Clause 6.]
3.11
life cycle cost
sum of the costs generated during the life cycle (3.10) of the item (3.13)
[SOURCE: EN 13306:2017, 11.1, modified — Note 1 to entry is omitted because EN 17666 defines the
stages given in Clause 6.]
3.12
physical asset
item (3.13) that has potential or actual value to an organization
Note 1 to entry: Examples of physical assets are components, machines, plants, buildings, infrastructures, etc.
[SOURCE: EN 13306:2017, 3.2]
3.13
item
part, component, device, subsystem, functional unit, equipment or system that can be individually
described and considered
[SOURCE: EN 13306:2017, modified — Notes 1, 2 and 3 to entry are omitted]
3.14
competence
proven ability to use knowledge, skills (3.15), and personal, social and/or methodological abilities, in
work or study situations and in professional and personal development
Note 1 to entry: Competence is described in the terms of responsibility and autonomy.
[SOURCE: EN 15628:2014, 3.1]
3.15
skills
ability to apply knowledge and use know-how to complete tasks and resolve problems
Note 1 to entry: Skills are described as cognitive (involving the use of logical, intuitive and creative thinking) or
practical (involving manual dexterity and the use of methods, tools and instruments).
[SOURCE: EN 15628:2014, 3.6]
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3.16
dependability
ability to perform as and when required
Note 1 to entry: Dependability includes availability (3.20), safety, security, durability, economics and their
influencing factors (reliability, maintainability (3.19), supportability (3.17), conditions of use and operators
influence).
Note 2 to entry: Dependability is used as a collective term for the time-related quality characteristics of an item.
[SOURCE: EN 13306:2017, 2.7, modified — In Note 1 to entry “maintenance support performance” is
replaced by “supportability”]
3.17
supportability
ability to be supported to sustain the required availability with a defined operational profile and given
logistic and maintenance resources
Note 1 to entry: Supportability of an item results from the inherent maintainability, combined with factors
external to the item that affect the relative ease of providing the required maintenance and logistic support.
[SOURCE: IEC 60050-192:2015, 192-01-31]
3.18
integrated logistic support
ILS
management process to determine and coordinate the provision of all materials and resources required
to meet the needs for operation and maintenance
Note 1 to entry: ILS is a process to determine the optimal maintenance support. ILS integrates logistic support
analysis and the development of resources, see Annex A.
[SOURCE: IEC 60050-192:2015, 192-01-30, modified — Note 1 to entry added]
3.19
maintainability
ability of an item under given conditions of use, to be retained in, or restored to, a state in which it can
perform a required function (3.8), when maintenance (3.1) is performed under given conditions and using
stated procedures and resources
Note 1 to entry: Maintainability may be quantified using appropriate measures or indicators and is then referred
to as maintainability performance.
[SOURCE: EN 13306:2017, 4.5]
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3.20
availability
ability of an item to be in a state to perform as and when required, under given conditions, assuming that
the necessary external resources are provided
Note 1 to entry: Required external resources, other than maintenance resources, do not affect the availability of
the item although the item may not be available from the user’s viewpoint.
Note 2 to entry: This ability depends on the combined aspects of the reliability, maintainability of the item, the
maintenance supportability and the maintenance actions carried out on the item.
Note 3 to entry: Availability may be quantified using appropriate measures or indicators and is then referred to
as availability performance (see EN 13306:2017, 4.9).
Note 4 to entry: There are several types of availability, for example: achieved availability (3.21), operational
availability (3.22) and inherent availability (3.23).
[SOURCE: EN 13306:2017, 4.7, modified — Note 4 to entry added]
3.21
achieved availability
probability than an item when used under stated conditions in an ideal support environment will operate
satisfactorily at any point in time
3.22
operational availability
availability (3.20) experienced under actual conditions of operation and maintenance
Note 1 to entry: Operational availability is determined considering down time due to failures and associated
delays, but excluding external causes.
[SOURCE: IEC 60050-192:2015, 192-08-03]
3.23
inherent availability
availability (3.20) provided by the design under ideal conditions of operation and maintenance
Note 1 to entry: Delays associated with maintenance, such as logistic and administrative delays, are excluded.
[SOURCE: IEC 60050-192:2015, 192-08-02]
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3.24
process
set of interrelated or interacting activities that use inputs to deliver an intended result
Note 1 to entry: Whether the “intended result” of a process is called output, product or service depends on the
context of the reference.
Note 2 to entry: Inputs to a process are generally the outputs of other processes and outputs of a process are
generally the inputs to other processes.
Note 3 to entry: Two or more interrelated and interacting processes in series can also be referred to as a process.
Note 4 to entry: Processes in an organization are generally planned and carried out under controlled conditions to
add value.
Note 5 to entry: A process where the conformity of the resulting output cannot be readily or economically validated
is frequently referred to as a “special process”.
[SOURCE: EN ISO 9000:2015, 3.4.1 and EN 17007:2017, 3.12, modified — Note 6 to entry in the original
definition from EN ISO 9000:2015 has been deleted.]
3.25
stakeholder
person or organization that can affect, be affected by, or perceive themselves to be affected by a decision
or activity
[SOURCE: ISO 55000:2014, 3.1.22, modified — Note 1 to entry deleted.]
3.26
risk
effect of uncertainty on objectives
Note 1 to entry: An effect is a deviation from the expected. It can be positive, negative or both, and can address,
create or result in opportunities and threats.
Note 2 to entry: Objectives can have different aspects and categories and can be applied at different levels.
Note 3 to entry: Risk is usually expressed in terms of risk sources, potential events, their consequences and their
likelihood.
[SOURCE: ISO 31073:2022, 3.1.1]
3.27
sustainability
state of the global system, including environmental, social and economic aspects, in which the needs of
the present are met without compromising the ability of future generations to meet their own needs
Note 1 to entry: The environmental, social and economic
...
SLOVENSKI STANDARD
oSIST prEN 17666:2021
01-junij-2021
Vzdrževanje - Vzdrževalni inženiring - Zahteve
Maintenance - Maintenance engineering - Requirements
Instandhaltung - Instandhaltungsengineering - Anforderungen
Ta slovenski standard je istoveten z: prEN 17666
ICS:
03.080.10 Vzdrževalne storitve. Maintenance services.
Upravljanje objektov Facilities management
oSIST prEN 17666:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 17666:2021
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oSIST prEN 17666:2021
DRAFT
EUROPEAN STANDARD
prEN 17666
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2021
ICS 03.080.10
English Version
Maintenance - Maintenance engineering - Requirements
Instandhaltung - Instandhaltungsengineering -
Anforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 319.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17666:2021 E
worldwide for CEN national Members.
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prEN 17666:2021 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations . 12
5 Maintenance engineering elements . 13
5.1 Principles and objectives . 13
5.1.1 General . 13
5.1.2 Maintenance engineering goals and objectives . 15
5.2 Information for maintenance engineering . 16
5.2.1 Asset taxonomy . 16
5.2.2 Data requirements . 18
5.2.3 Maintenance documentation . 19
5.3 Determination of failure management policies . 19
5.3.1 General . 19
5.3.2 Operational and maintenance functional requirements . 21
5.3.3 Identify the functional requirements and failure modes . 21
5.3.4 Develop the maintenance tasks . 22
5.3.5 Determine the task frequencies . 23
5.3.6 Corrective maintenance . 23
5.3.7 Define the spare parts requirements . 24
5.3.8 Development of preventive maintenance (PM) program . 25
5.4 Cost estimates . 25
5.4.1 Costs related to organization, manning and support . 25
5.4.2 Justify failure management policy . 26
5.5 Asset performance and continuously improvement . 26
5.5.1 Report the review results . 26
5.5.2 Analyse the need for improvements . 26
5.5.3 Report technical data and assess technical condition . 26
6 Maintenance engineering in the life cycle . 27
6.1 Life cycle stages . 27
6.2 Objectives and roles of maintenance engineering for each life cycle stage . 28
6.3 Maintenance engineering activities during the life cycle stages . 31
6.4 Concept stage . 33
6.4.1 Objectives for concept stage . 33
6.4.2 Feasibility substage . 34
6.4.3 Concept baseline substage . 34
6.4.4 Maintenance engineering in the concept stage . 34
6.5 Development stage . 35
6.5.1 Objectives for the development stage . 35
6.5.2 Preliminary design . 35
6.5.3 Detailed design . 38
6.6 Realization stage . 40
6.6.1 General . 40
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6.6.2 Maintenance engineering in the realization stage . 40
6.7 Utilization stage. 41
6.8 Disposal/transition stage . 43
7 Performance assessment through indicators . 44
8 The Digitalization of maintenance engineering . 44
8.1 General . 44
8.2 Implementation steps . 45
8.3 Risks associated with digitalization . 45
8.4 Recommendations . 46
Annex A (informative) Relationship between maintenance engineering and integrated
logistics support (ILS) . 47
A.1 ILS goals . 47
A.2 ILS areas . 47
A.3 ILS elements . 47
A.4 LSA Methodology . 48
A.5 ILS methodology per life cycle stages . 49
Annex B (informative) Map of CEN/TC 319 Maintenance standards . 51
B.1 The map of CEN/TC 319 standards . 51
B.2 Description of the groups of standards . 53
B.2.1 Common basis . 53
B.2.2 Management . 53
B.2.3 Methodologies . 53
B.2.4 Resources . 53
Annex C (informative) Maintenance activities and shutdown requirements . 54
Annex D (informative) Maintenance engineering techniques and analysis. 58
Annex E (informative) Examples of performance indicators for maintenance engineering . 74
E.1 Introduction to indicators . 74
E.2 Performance indicators for maintenance engineering . 74
E.3 Use of indicators in the different maintenance engineering steps . 75
E.4 Examples of performance indicators for maintenance engineering . 76
Annex F (informative) The digitalization of maintenance engineering . 80
F.1 Introduction. 80
F.2 Maintenance using digitalized data . 80
F.3 Artificial Intelligence Analytics applied to Maintenance Engineering . 80
F.4 Ethics of Artificial intelligence (AI) . 81
Annex G (informative) Establishing a technical hierarchy . 82
Annex H (informative) Checklist for maintainability design within maintenance
engineering . 84
Bibliography . 87
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European foreword
This document (prEN 17666:2021) has been prepared by Technical Committee CEN/TC 319
“Maintenance”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
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Introduction
Maintenance engineering is a discipline applying competencies, methods, techniques and tools to develop
and support maintenance in order to ensure that an item is able to perform its required functions in a
safe, sustainable and cost-effective manner throughout the life cycle.
The prime objective of maintenance engineering is to contribute to the achievement of overall
stakeholder requirements through optimized and cost-effective maintenance as part of physical asset
management. The scale or scope of maintenance engineering varies depending on the complexity of the
physical asset, its technical condition, the organization, and its degree of authority to influence design
and maintenance.
The benefits of the contributions from maintenance engineering include, but are not limited to:
— achievement of maintainability and availability goals by influencing design;
— risk analysis related to maintenance;
— application of sustainability principles;
— achieved required integrity and safety level;
— achieved required performance and technical condition;
— improved life extension decisions;
— improved maintenance support performance;
— reduced environmental footprint by saving energy and raw materials consumption;
— improved competitiveness and output value.
This standard is generic and provides guidance on the methodology to achieve maintenance engineering
objectives. The intended users of this standard are personnel involved in design, procurement,
construction, commissioning, operation, improvement, maintenance and disposal/transition or
decommissioning of physical assets. No specific structure or size of organization is assumed so that
maintenance engineering effort should be tailored to suit specific applications and organisational
requirements.
While maintenance engineering has the most impact when applied during the concept stage and design
of a physical item, this standard is applicable to maintenance engineering in all life cycle stages, and for
different scenarios, for example
— manufacturer producing one equipment and then maintaining it.
— transfer of property at commissioning to a buyer who will be in charge of maintenance.
— transfer of property at commissioning followed by a warranty period. The seller is responsible during
the warranty and the buyer thereafter.
— maintenance service (sub) contract by the seller to the buyer or to a third party.
This standard is part of a group of standards published by CEN/TC 319 giving guidance on maintenance,
see Annex B and the committee site on www.cen.eu:
https://standards.cen.eu/dyn/www/f?p=204:7:0::::FSP_ORG_ID:6300&cs=1A64AA79FCFDE906561AF
DA09269B3123
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1 Scope
This document describes the generic requirements, criteria and contents of maintenance engineering.
This includes guidance on methods and techniques which are used to sustain the required functions of
items at any stage of their life cycle.
This document gives guidance on how maintenance engineering can contribute to the assurance of
required integrity, safety, reliability, maintainability and availability to achieve a sustainable balance
between performance, risk and costs.
This document does not give guidance on how to set up systems and infrastructure to support the
maintenance engineering function.
This document refers to standards that further describe detailed methods and techniques.
NOTE The overall maintenance process and management is covered by other CEN/TC 319 standards EN 17007
[10] and prEN (WG 8).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 13306:2017, Maintenance - Maintenance terminology
EN 15628, Maintenance - Qualification of maintenance personnel
3 Terms and definitions
For the purposes of this document the terms and definitions given in EN 13306:2017, EN 15628 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
maintenance
combination of all technical, administrative and managerial actions during the life cycle (3.13) of an item
(3.7) intended to retain it in, or restore it to, a state in which it can perform the required function (3.8)
Note 1 to entry: Technical maintenance actions include observation and analyses of the item state (e.g.
inspection, monitoring, testing, diagnosis, prognosis, etc.) and active maintenance actions (e.g. repair,
refurbishment).
Note 2 to entry: See also the definitions of improvement and modification in EN 13306 [2].
[SOURCE: EN 13306:2017, 2.1]
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3.2
operation
combination of all technical, administrative and managerial actions, other than maintenance actions, that
results in the item being in use
Note 1 to entry: Maintenance actions carried out by operators are not included in operation.
Note 2 to entry: In this document, operational and operations are used as synonyms.
[SOURCE: EN 13306:2017, 2.9]
3.3
engineering
branch of science and technology concerned with the design, building, use and disposal of engines,
machines and structures
3.4
maintenance engineering
engineering (3.3) discipline applying competencies (3.10), methods, techniques and tools to develop and
support maintenance (3.1) in order to assure that an item (3.7) is able to perform its required functions
(3.8) in a safe, sustainable and cost-effective (3.6) manner throughout the life cycle (3.13)
3.5
maintenance management
all activities of the management that determine the maintenance (3.1) requirements, objectives,
strategies and responsibilities, and implementation of them by such means as maintenance planning,
maintenance control, and the improvement of maintenance activities and economics
[SOURCE: EN 13306:2017, 2.2]
3.6
cost-effective
balance of cost, risk, opportunity and performance taking into account stakeholder objectives
Note 1 to entry: Performance covers quality, short and long term.
3.7
item
part, component, device, subsystem, functional unit, equipment or system that can be individually
described and considered
Note 1 to entry: A number of items e.g. a population of items, or a sample, may itself be considered as an item.
Note 2 to entry: An item may consist of hardware, software or both.
Note 3 to entry: Software consists of programs, procedures, rules, documentation and data of an information
processing system.
Note 4 to entry: Services is included.
Note 5 to entry: Systems may include people.
[SOURCE: EN 13306:2017, modified — Note 4 and 5 to entry are added]
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3.8
required function
function, combination of functions, or a total combination of functions of an item which are considered
necessary to fulfil a given requirement
Note 1 to entry: “Necessary to fulfil a given requirement” may also include asset value preservation.
Note 2 to entry: The given requirement may be expressed or implied and may in some cases be below the original
design specifications.
Note 3 to entry: The required function, by implication, also covers what the item shall not do.
[SOURCE: EN 13306:2017, 2.6]
3.9
physical asset
item (3.7) that has potential or actual value to an organization
Note 1 to entry: Examples of physical assets are components, machines, plants, buildings, infrastructures, etc.
Physical asset and technical system are often used as synonyms.
[SOURCE: EN 13306:2017, 3.2, modified — Added the last sentence in the note.]
3.10
competence
proven ability to use knowledge, skills (3.11), and personal, social and/or methodological abilities, in
work or study situations and in professional and personal development
Note 1 to entry: Competence is described in the terms of responsibility and autonomy.
[SOURCE: EN 15628:2014, 3.1]
3.11
skills
ability to apply knowledge and use know-how to complete tasks and resolve problems
Note 1 to entry: Skills are described as cognitive (involving the use of logical, intuitive and creative thinking) or
practical (involving manual dexterity and the use of methods, tools and instruments).
3.12
criticality
numerical index of the severity of a failure or a fault combined with the probability
or frequency of its occurrence
Note 1 to entry: The numerical index in this context may be defined, for example, as an area in the frequency of
failure occurrence - severity matrix diagram (see Annex E in EN 13306:2017).
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3.13
life cycle
series of stages through which an item goes, from its conception to disposal
EXAMPLE: A typical system lifecycle consists of acquisition, operation, maintenance, modernisation,
decommissioning and/or disposal
Note 1 to entry: The stages identified will vary with the application. Reuse and recycle follows disposal.
[SOURCE: EN 13306:2017, 4.18]
3.14
life cycle cost
sum of the costs generated during the life cycle (3.13) of the item (3.7)
Note 1 to entry: For a user or an owner of an item, the total life cycle cost may include only those costs pertaining
to acquisition, operation, maintenance and disposal.
[SOURCE: EN 13306:2017, 11.1]
3.15
indicator
quantitative or qualitative measure of a characteristic or a set of characteristics of a phenomenon or
performance of activities, according to defined criteria or a given formula or questionnaire
Note 1 to entry: The indicators are a tool for development and implementation of a strategy for monitoring
progress towards the goals outlined in the strategy.
[SOURCE: EN 15341:2019, 3.3]
3.16
key performance indicator
KPI
indicator (3.15) considered significant
[SOURCE: EN 15341:2019, 34]
3.17
maintenance plan
structured and documented set of tasks that include the activities, procedures, resources and the time
scale required to carry out maintenance (3.1)
[SOURCE: EN-ISO 41011:2018, 2.5]
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3.18
dependability
ability to perform as and when required
Note 1 to entry: Dependability includes availability (3.22), safety, security, durability, economics and their
influencing factors (reliability, maintainability (3.21), supportability (3.19), conditions of use and operators
influence).
Note 2 to entry: Dependability is used as a collective term for the time-related quality characteristics of an item.
[SOURCE: EN 13306:2017, 2.7, modified — In Note 1 to entry “maintenance support performance” is
replaced by “supportability”]
3.19
supportability
ability to be supported to sustain the required availability with a defined operational profile and given
logistic and maintenance resources
Note 1 to entry: Supportability of an item results from the inherent maintainability, combined with factors
external to the item that affect the relative ease of providing the required maintenance and logistic support.
[SOURCE: IEC 60050-192:2015, 192-01-31]
3.20
integrated logistics support
ILS
management process to determine and coordinate the provision of all materials and resources required
to meet the needs for operation and maintenance
Note 1 to entry: ILS is a process to determine the optimal maintenance support. ILS integrates logistics support
analysis and the development of resources, see Annex A.
[SOURCE: IEC 60050-192: 2015, 192-01-30, modified — Note 1 to entry added]
3.21
maintainability
ability of an item under given conditions of use, to be retained in, or restored to, a state in which it can
perform a required function (3.8), when maintenance (3.1) is performed under given conditions and using
stated procedures and resources
Note 1 to entry: Maintainability may be quantified using appropriate measures or indicators and is then referred
to as maintainability performance.
[SOURCE: EN 13306:2017, 4.5]
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3.22
availability
ability of an item to be in a state to perform as and when required, under given conditions, assuming that
the necessary external resources are provided
Note 1 to entry: Required external resources, other than maintenance resources, do not affect the availability of
the item although the item may not be available from the user’s viewpoint.
Note 2 to entry: This ability depends on the combined aspects of the reliability, maintainability of the item, the
maintenance supportability and the maintenance actions carried out on the item.
Note 3 to entry: Availability may be quantified using appropriate measures or indicators and is then referred to
as availability performance (see EN 13306:2017, 4.9).
Note 4 to entry: There are several types of availability, for example: achieved availability (3.23), operational
availability (3.24) and inherent availability (3.25).
[SOURCE: EN 13306:2017, 4.7, modified — Note 4 to entry added]
3.23
achieved availability
probability than an item when used under stated conditions in an ideal support environment will operate
in a satisfactorily at any point in time
3.24
operational availability
availability (3.22) experienced under actual conditions of operation and maintenance
Note 1 to entry: Operational availability is determined considering down time due to failures and associated
delays, but excluding external causes.
[SOURCE: IEC 60050-192: 2015, 192-08-03]
3.25
inherent availability
availability (3.22) provided by t
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