The Master Minimum Equipment List is developed during aircraft certification process. During this process MMEL procedures are developed to allow the continued operation of an aircraft with specific items of equipment inoperative under certain circumstances. The Federal Aviation Administration (FAA) has found that for particular situations an acceptable level of safety can be determined with specific items of equipment inoperative for a limited period of time, until repairs can be made. The MMEL document describes the limitations that apply when an operator wishes to develop a Minimum Equipment List. The MMEL is used as a starting point in the development and review of an individual operators MEL.

Individual MMELs to specific aircrafts can be downloaded at the FAA Web page Flight Standards Information Management System