What is the purpose of the Minimum Equipment List (MEL) in relation to ADs and airworthiness?

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The idea behind the Minimum Equipment List is to define what equipment may be inoperative and still keep the aircraft technically airworthy under defined conditions. The MEL sets the approved limits, including which items can be left unserviceable, the circumstances that must be met, and the time frames for repair or return to service. It is derived from the Master Minimum Equipment List and is approved by the aviation authority, ensuring safety standards are maintained while the aircraft continues to operate. When a component is inoperative, the MEL guides the crew on any operational restrictions and the maintenance actions required to restore service. It cannot authorize inoperative status for items that an Airworthiness Directive requires to be operative, and it is not used as a passenger manifest, a maintenance manual, or a tool for determining aircraft registration.