ISO 23460:2023

INTERNATIONAL ISO
STANDARD 23460
Second edition
2023-06
Space projects — Programme
management — Dependability
assurance requirements
Projets spatiaux — Management de programme — Exigences
d'assurance de sécurité de fonctionnement
Reference number
© ISO 2023
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ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Policy and principles . 2
4.1 Basic approach . 2
4.2 Tailoring . 2
5 Dependability programme management . 2
5.1 Organization . 2
5.2 Dependability programme planning. 2
5.3 Dependability critical items . 3
5.4 Design reviews . 3
5.5 Audits . 3
5.6 Use of previously designed, fabricated, qualified or flown items . 3
5.7 Subcontractor control . 3
5.8 Progress reporting . 4
5.9 Documentation . 4
6 Dependability risk reduction and control . 4
6.1 General . 4
6.2 Identification and classification of undesirable events . 4
6.3 Assessment of failure scenarios . 5
6.4 Criticality classification of functions and products . 5
6.5 Actions and recommendations for risk reduction . 5
6.6 Risk decisions . 6
6.7 Verification of risk reduction . 6
6.8 Documentation . 6
7 Dependability engineering .7
7.1 Integration of dependability in the project . 7
7.2 Dependability requirements in technical specifications . 7
7.3 Dependability design criteria . 7
7.3.1 Consequence category and severity . 7
7.3.2 Failure tolerance . 8
7.3.3 Design approach . 8
7.4 Involvement in test definition . 9
8 Dependability analysis . 9
8.1 Dependability analysis and the project life cycle . 9
8.2 Dependability analytical methods . 9
8.2.1 General . 9
8.2.2 Reliability analyses . 10
8.2.3 Maintainability analyses . 11
8.2.4 Availability analyses .12
8.3 Classification of design characteristics in production documents .12
8.4 Critical items list .12
9 Dependability testing, demonstration and data collection .13
9.1 Dependability testing and demonstration . 13
9.1.1 Reliability . 13
9.1.2 Maintainability . 13
9.1.3 Availability . 13
9.2 Dependability data collection and dependability growth .13
iii
10 Lessons learned activity .14
Annex A (informative) Relationship between dependability activities and programme
phases .15
Annex B (informative) Document requirement list (DRL) .17
Bibliography .18
iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,
Subcommittee SC 14, Space systems and operations.
This second edition cancels and replaces the first edition (ISO 23460:2011), which has been technically
revised.
The main changes are as follows:
— updating of normative references and related terms and definitions;
— minor changes on tables.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
Introduction
The objective of dependability assurance is to ensure a successful mission by optimizing the system
dependability within all competing technical, scheduling and financial constraints.
Dependability assurance is a continuous and iterative process throughout the project life cycle, using
quantitative and qualitative approaches, with the aim of ensuring conformity to reliability, availability
and maintainability requirements.
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INTERNATIONAL STANDARD ISO 23460:2023(E)
Space projects — Programme management —
Dependability assurance requirements
1 Scope
This document specifies the requirements for a dependability (reliability, availability and
maintainability) assurance programme for space projects.
It defines the dependability requirement
...