What is the abbreviation 'MRT' commonly known as in airline terminology?

The abbreviation 'MRT' in airline terminology is commonly known as the Manual Release Tool. This tool is crucial in various operational scenarios, particularly during emergencies or specific maintenance procedures where manual intervention is required. The Manual Release Tool allows crew members or technicians to perform actions that might otherwise be automated, ensuring safety and compliance with operational protocols.

By understanding this terminology and tool, airline personnel can effectively respond to situations requiring manual overrides, maintaining safety and efficiency in flight operations. The other options do not represent standard terminology used in airline operations and would not apply in the context referred to by 'MRT'.