Factory Acceptance Test (FAT) is a type of quality assurance process that ensures the equipment or system being manufactured meets the requirements and specifications set by the customer. It is conducted at the manufacturer's facility before the equipment is shipped to the customer's site. The FAT involves a series of tests and inspections performed on the equipment to verify that it is operating properly, is safe to use, and meets all relevant regulations and standards. The FAT provides the customer with the opportunity to witness the equipment in operation, identify any potential issues, and ensure that all contractual requirements have been met.