What might a proposed modification through an STC affect regarding an aircraft's approved MEL?

A proposed modification through a Supplemental Type Certificate (STC) can indeed affect an aircraft's approved Minimum Equipment List (MEL) because any change made to the aircraft's configuration or capabilities may necessitate a reevaluation of the existing MMEL (Master Minimum Equipment List). When modifications are introduced, they could potentially alter the operational limitations and requirements specified in the MMEL.

The MMEL serves as a guideline for creating the specific MEL for an aircraft, detailing what equipment needs to be functional for safe operation. If an STC modifies the system or components that the MMEL addresses, such as by changing the number or type of required instruments or systems, it could indeed invalidate parts of the MMEL. Therefore, it is important to scrutinize how the modification impacts the operational capability and requirements laid out in the MMEL before making any decisions about the MEL.

This understanding ensures that the aircraft remains in compliance with airworthiness standards and operational safety requirements post-modification.