Reliability engineering is related to systems engineering ( as a subsystem). Reliability engineering is concerned with ensuring a product or component operates without failure, over a specified lifespan.
The role of a Reliability Engineer
The main role of a reliability engineer is to identify and manage potential risk factors to the reliability of a system.
For example, when I previously worked for an international defence aerospace company, I analysed the systems and subsystems of a space satellite, to identify potential failure weakness areas of the satellite’s design.
FMEA is short for Failure Mode & Effect Analysis
FMECA is short for Failure Modes Effects & Criticality Analysis
Def-Stan is short for defence standards.
DRACAS is short for Data Reporting, Analysis and Corrective Action System.
Nato codification gives a standard identification for parts and components.
In the UK the United Kingdom National Codification Bureau has sole responsibility for issuing NATO codification numbers. United Kingdom Codification Bureau – Home (mod.uk)