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    Ministry of Defence

    Defence Standard

    00-49/Issue 1 26 JANUARY 1996

    RELIABILITY AND MAINTAINABILITY

    MOD GUIDE TO TERMINOLOGY

    DEFINITIONS

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    DEF STAN 00-49/1

    AMENDMENTS ISSUED SINCE PUBLICATION

    AND NO DATE OF TEXT AFFECTED SIGNATURE &

    ISSUE DATE

    Revision Note

    Historical Record

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    DEF STAN 00-49/1

    RELIABILITY AND MAINTAINABILITY

    MOD GUIDE TO TERMINOLOGY

    DEFINITIONS

    PREFACE

    i The principle of this Standard is to state explicitly the exact meaning

    of the Reliability and Maintainability (R&M) terminology used by the

    Ministry of Defence (MOD) in R&M Defence Standards.

    ii The MOD accepts the British Standards concepts of R&M(A) and by

    inference accepts BS 4778: Part 3 Availability, Reliability and

    Maintainability Terms but excluding the terms listed in the Defence

    Standard.

    iii The MODs hierarchical order of preference of sources of referenceddefinitions for R&M terminology is stated at 2.4.

    iv Users of this Standard shall note that some material may be claimed to

    be subject to copyright in this or other countries. Copyright, where

    known, is acknowledged.

    v This Standard was prepared by the Committee for Defence Equipment

    Reliability and Maintainability (CODERM).

    vi This Standard has been agreed by the authorities concerned with its useand is intended to be used whenever relevant in all future designs,

    contracts, orders etc and whenever practicable by amendment to those

    already in existence. If any difficulty arises which prevents applicationof the Defence Standard, the Directorate of Standardization shall be

    informed so that a remedy may be sought.

    vii Any enquiries regarding this Standard in relation to an invitation totender or a contract in which it is incorporated are to be addressed to the

    responsible technical or supervising authority named in the invitation to

    tender or contract.

    viii This Standard has been devised for the use of the Crown and itscontractors in the execution of contracts for the Crown. The Crown hereby

    excludes all liability (other than liability for death or personal injury)

    whatsoever and howsoever arising (including, but without limitation,

    negligence on the part of the Crown its servants or agents) for any loss or

    damage however caused where the Standard is used for any other purpose.

    1

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    DEF STAN 00-49/1

    CONTENTS

    Preface

    0 Introduction

    1 Scope

    2 Related Documents3 Definitions

    Annex A Lines, Depths/Levels of Service Maintenance

    Annex B Matrix of RN Lines and Depths of Maintenance

    Annex C Matrix of Army Lines of Equipment Support and Levels

    of Maintenance

    Annex D Matrix of RAF Lines and Depths of Maintenance

    PAGE

    1

    3

    3

    3

    5

    A-1

    B-1

    C-1

    D-1

    2

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    DEF STAN 00-49/1

    RELIABILITY AND MAINTAINABILITY (R&M)

    MOD GUIDE TO TERMINOLOGY

    DEFINITIONS

    0 Introduction

    The MOD considers the term 'Reliability and Maintainability' (R&M) to be

    generic and interprets it to encompass related specific concepts such as

    availability, supportability, testability etc.

    Whereas the MOD accepts the concepts of R&M described in BS 4778: Part 3

    Section 3.1, and by inference generally accepts the derived definitions,

    but by reasons of: uniqueness of some MOD R&M terms; extant NATO

    definitions; exceptions; etc, this Defence Standard is considered necessary

    towards a rationalization of MOD R&M terms that will facilitate exact and

    taut specifications/contracts.

    1 Scope

    This Defence Standard addresses only those R&M terms that are unique to the

    MOD, are extant NATO definitions, attract particular meaning in an

    individual Service, are exceptions to MODs acceptance of BS 4778; or are

    accredited quotations, selected from the related documents and included for

    completeness.

    All other R&M terms that are adequate and acceptable to the MOD are defined

    in the Def Stan 00-40 through 00-49 Series or in the documents noted at

    2.1.

    2 Related Documents

    2.1 The followingof this Standard:

    ARMP-7

    BS 4778: Part 3

    JSP 110

    MIL-STD-721

    MIL-STD-1309

    MIL-STD-2165

    ANSI/IEEE: 610.12

    documents and publications are referred to in the text

    NATO R&M Terminology Applicable to ARMPs

    Availability, Reliability and Maintainability Terms

    Joint Service Glossary

    Definitions of Effectiveness Terms of Reliability

    Maintainability, Human Factors and Safety

    Definitions of Terms for Test, Measurement and

    Diagnostic Equipment

    Testability Program for Systems Equipment

    Glossary of Software Engineering Terminology

    2.2 Reference in this Standard to any related documents means in anyinvitation to tender or contract the edition and all amendments current at

    the date of such tender or contract unless a specific edition is indicated.

    3

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    DEF STAN 00-49/1

    2.3 The documents listed may be obtained from the sources shown below:

    DOCUMENT SOURCE

    Allied Reliability and Directorate of Standardization

    Maintainability Publication (ARMP) Stan 2

    Kentigern House

    65 Brown Street

    GLASGOW G2 8EX

    British Standard (BS) BSI

    Sales Department

    389 Chiswick High Road

    LONDON W4 4AL

    Defence Standard (Def Stan) Directorate of Standardization

    Stan 1

    Kentigern House

    65 Brown Street

    GLASGOW G2 8EX

    Joint Service Glossary (JSP 110) MOD Forms and Publications Branch

    CSEMwrawg Road

    Llangenennech

    Llanelli

    DYFED SA14 8YP

    Military Standard (MIL-STD) Technical Indexes

    Willoughby Road

    American National Standards Bracknell

    Institute (ANSI)/ BERKS RG12 4DW

    Institute of Electrical &

    Electronics Engineers (IEEE):

    610.12 Glossary of Software

    Engineering Terminology

    2.4 The above documents are listed in order of preference and hierarchy

    for the selection of Standards for MOD procurement and hence infer the

    hierarchal order of preference of sources of MOD R&M terminology.

    4

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    DEF STAN 00-49/1

    availability - operational (Ao)

    The proportion of the defined operational period during which the equipment

    is available for use without any performance limitations.

    ie Ao = uptime measured over an operational period

    uptime + downtime

    Operational availability may be expressed by the formula:

    Ao = OT + ST

    OT + ST + TPM + TCM + ALDT

    where: OT = operating time

    ST = standby time

    TPM = total preventative maintenance time

    TCM = total corrective maintenance time

    ALDT = administration and logistics delay time spent waiting for

    parts, maintenance personnel or transportation

    NB: Units will be defined in accordance with Service practice.

    battle damage repair

    Is essential repair, which may be improvised, carried out in a battle

    environment in order to return damaged or disabled equipment to temporary

    service.

    battle damage repair - aircraft (RAF use)

    Is the maintenance action taken in wartime to maximize the availability of

    damaged mission capable aircraft.

    battlefield day

    The battlefield day specifies how the equipment is likely to be used during

    a typical 24 - hour period in war.

    battlefield mission

    The battlefield mission specifies how the equipment is likely to be used

    during a typical war-time mission. This may specify the usage profile for

    the equipment for a battlefield mission, or it may be comprised of a series

    of consecutive battlefield days or equipment operating cycles.

    build standard

    Is the approved specifications, design and contemporary support thatcomprise the performance and engineering definition.

    built-in-test (BIT) (see ARMP-7)

    built-in-test equipment (BITE) (see ARMP-7)

    cannibalize (cf robbing)

    To remove, without subsequent replacement, useful serviceable items from

    one equipment/system for use on other equipment/systems.

    NOTE: These definitions for cannibalize and robbing are a clarification of

    the Joint Service Glossary (JSP 110) definition.

    6

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    DEF STAN 00-49/1

    configurationIs the functional and physical characteristics of materiel as described in

    technical documents and achieved in a product.

    configuration control (see ARMP-7)

    data classificationIs the process by which incident data are sorted into different categories,

    (eg cause, significance, maintenance requirement) applicable to the R&M

    parameters being assessed.

    defect (see ARMP-7)

    degradation

    Is a gradual impairment of the ability to perform.(MIL-STD 721)

    degradation fault

    Is a fault which reduces performance below a specified level, but which

    does not necessarily terminate the function.

    degradation - graceful/gradual. (synonymous terms)

    Is the sufficiently long interval between the occurrence of a potential

    failure, which produces degraded capability, and its dec

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