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MEL / CDL Dictionary

This program permits the creation and maintenance of a data file of Minimum Equipment List (MEL) and Configuration Deviation List (CDL) code numbers and their corresponding explanations and descriptions. The descriptions are limited to either 50 or 60 characters depending on the classification of the item: operational or non-operational respectively. The descriptions are not intended to be definitive. The objective is to make them detailed enough to alert Dispatchers to any restrictions that may affect flight planning. Up to 10 lines of comment may be added to each item to help to fully describe it. These comments are attached to the flight plan and will thus be available to the flight crew. MEL penalties can be seen using this menu and the FOMS 428 menu. 

In the image, it shows that:

  • MEL effect ICE is applied to enroute and based on EFH and ERP.

  • MEL effect TME effect is based on the sunrise/sunset time in FOMS 466.


For instructions on how to make modifications on the WebFOMS screens, see Modify, View Aircraft Characteristics. It uses the Aircraft Characteristics as an example but can be applied to all WebFOMS screens.


Screen is the default view when you first go to a WebFOMS screen. When Screen is selected you can view all records that exist in the system.  Select the arrow in the first field of the WebFOMS screen to access the drop-down menu to view the list of available records. Only items that exist in the database are shown in the drop-down list.


  • The following descriptions represent the typical access and privileges given to users designated as Dispatch Managers/Supervisors. Users with dispatcher privileges will have limited access to a subset of the screens presented.

  • Refer to the FOMS 425 (Aircraft MEL/CDL Status Program) article for an overview of the MEL/CDL Codes/Dictionary.

  • For an overview of the WebFOMS features, refer to the Aircraft Characteristics article. The features described there can be applied to all screens.

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