What are MEL and CDL and why are they important in KSV?

• A. MEL lists inoperative equipment allowed with restrictions; CDL lists configuration deviations that permit flight with limitations.
• B. MEL is minimum engine limit; CDL is cabin door limit.
• C. MEL is maximum efficient load; CDL is cabin density limit.
• D. MEL is maintenance event log; CDL is configuration data log.

Answer: (D)

In KSV, MEL and CDL are the records that tell you what can be flown with certain conditions and how the aircraft may be configured for operation. The MEL is described as a maintenance event log, which tracks maintenance actions and conditions related to equipment, helping crews and maintenance teams understand what has happened, what is still permissible, and what repairs or time limits apply. The CDL is described as a configuration data log, which records deviations from the normal configuration and the limits within which the aircraft may operate with those deviations.

These logs are important because they provide the official basis for dispatch decisions and for understanding what is allowed during flight. They ensure that any inoperative items or configuration changes are properly documented, communicated to the crew, and followed according to procedures, so safety and regulatory requirements are maintained. For KSV purposes, recognizing that MEL captures maintenance-related status and CDL captures configuration-related status helps you assess what limitations apply before a flight and what actions are required to comply.