If a required MEL item is inoperative, what is the proper procedure before flight?

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Minimum Equipment List governs what can be flown with inoperative equipment and under what conditions. When a required MEL item is not functioning, you can only proceed if the MEL explicitly permits operating with that item inoperative and you have the proper authorization to dispatch. This means checking the MEL entry for the specific item to verify any limitations, time limits, or required actions, and obtaining the necessary approval from maintenance or flight dispatch before departure. If the MEL does not authorize the inoperative condition, or if you fly without the required authorization, the flight cannot depart. Grounding would be required only when no MEL authorization is available or the item cannot be deferred.