ISO 5843-8:1988

Overview

ISO 5843-8:1988 - Aerospace - List of equivalent terms - Part 8: Aircraft reliability is a multilingual terminology resource that provides an alphabetical list of reliability-related terms in English, French, Russian and German. Published by ISO/TC 20 (Aircraft and space vehicles), this part of ISO 5843 focuses specifically on vocabulary used in the field of aircraft reliability. The English list is given in alphabetical order; French and Russian are ISO’s official languages for this part, and German terms were added at the request of the German member body (DIN).

Key topics

This document is a terminology standard rather than a performance specification. It standardizes equivalent words and phrases across four languages to reduce ambiguity in international aerospace work. Key technical topics covered in the term list include:

• Failure and fault terminology: failure, fault, failure cause, failure mechanism, failure rate, dangerous/ non‑dangerous failure
• Redundancy types: active, constant/permanent, functional, combined and duplication (single) redundancy
• Reliability metrics: availability, mean time between failures (MTBF), mean time to repair/overhaul, mean life, mean storage time
• Maintainability and maintenance: maintainability, maintenance, overhaul life, time between overhauls
• Operational terms: downtime, idle time, delay (departure), operational failure, attended/controlled operation
• Lifecycle and durability: durability, wear‑out period, life-expiry/wear‑out failure period, life testing
• Diagnostics and repair: diagnosis of defect, fault location time, debug/forecast failure period
• Safety and tolerance: flight safety, damage tolerance, non‑repairable item

Applications

ISO 5843-8 is useful wherever precise, consistent multilingual vocabulary is required in aerospace reliability contexts. Typical users include:

• Reliability, safety and systems engineers working on aircraft design, certification and analysis
• Maintenance planners and logistics/MTTR analysts defining service/repair procedures
• Technical authors, translators and regulatory writers preparing manuals, maintenance instructions and certification dossiers in multiple languages
• Procurement, interoperability and contract teams requiring unambiguous terminology for specifications and acceptance criteria
• Standards developers and training organizations aligning terminology across international projects

Benefits include improved cross‑border communication, reduced translation errors, and consistent interpretation of reliability concepts in contracts, technical documentation and certification processes.

Related standards

• Part of the ISO 5843 series (multilingual aerospace terminology) and prepared under ISO/TC 20.
• Users should reference other parts of ISO 5843 for additional aerospace topic glossaries and consult the latest editions of related ISO standards when cited.

Keywords: ISO 5843-8, aircraft reliability, aerospace terminology, multilingual glossary, reliability terms, MTBF, availability, maintainability, redundancy.