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MEL vs CDL: Understanding the Difference in Aircraft Dispatch

Tue, May 05, 2026

MEL vs CDL: Understanding the Difference in Aircraft Dispatch

In aircraft operations, both the Minimum Equipment List (MEL) and the Configuration Deviation List (CDL) allow an aircraft to be dispatched with certain items inoperative, but they apply to very different situations.

The MEL, approved under the Federal Aviation Administration or equivalent authority, covers systems and equipment that are installed on the aircraft but not functioning. It defines what can be inoperative, under what conditions the aircraft can still be dispatched and any required procedures or limitations.

The CDL, by contrast, applies to external parts of the aircraft that are missing rather than inoperative, such as panels, fairings or aerodynamic components. It specifies performance penalties, weight adjustments and operational restrictions associated with those missing items.

In simple terms, the MEL deals with equipment that is present but not working, while the CDL addresses components that are physically absent. Both are essential tools that allow safe and compliant operations without unnecessarily grounding the aircraft.

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