Safety - The condition of being free from unjustifiable risks or of being considered free of dangers. With this definition, safety refers both to individuals and other beings but also to real inanimate objects or systems as well as abstract objects.
SAT - (Site Acceptance Test) Acceptance test/acceptance at the customer's premises, usually after the FAT (factory acceptance test) has taken place.
Service - Measures involving actions such at adjusting, cleaning, changing and overhauling equipment to retain it in the specified state, carried out in compliance with technical regulations or the manufacturer's instructions. Not to be confused with maintenance. Service is – like repair and inspection – part of maintenance.
Software update - Process of updating the software or other data.
Software upgrade - Process of changing a product to a higher configuration or version.
SOP (Standard operating procedure) - Written and approved work instructions on how to carry out routine operations, including checking and documenting results. It serves to help staff carry out their tasks properly.
Spare parts - Parts that are used to replace defective or worn parts of a complex product. Spare parts are required to replace, e.g., movable parts that are subject to wear and tear during normal operation, or to replace parts that get damaged or destroyed or become unusable due to improper handling or improper use.
Specification - A document describing comprehensively, precisely and in a verifiable way the requirements, the design, behavior or other properties of a product, system, component or service and, often, also the recommended procedures to determine if these requirements are met.
Standard procedure - A more or less uniform/standardized and recognized way of doing something. Standardization of products, procedures or methods, used especially in the technical field. Standard procedures are recommendatory in nature. (Notice: The English term "standard" corresponds to the German term "Norm".)