Which statement regarding the Supplemental Type Certificate is true?

The statement that a Supplemental Type Certificate (STC) requires all applicants to demonstrate compliance independently is true. This means that each applicant must provide evidence that their modification or change meets the applicable safety and performance standards set by the regulatory authority. Each applicant's own analysis and compliance demonstration ensure that the STC can be trusted across different utilizations or modifications made to the aircraft.

In essence, this requirement is in place to maintain high safety standards in aviation by ensuring that all modifications are thoroughly vetted and meet all necessary regulations. If one applicant's demonstration of compliance was inadequate or if they were allowed to rely on another's findings without scrutiny, it could potentially compromise aircraft safety. Hence, independent verification is a vital part of the process when it comes to STCs.

This context emphasizes the importance of safety and regulatory compliance in the aviation field and illustrates why the process is structured to require independent demonstrations from each applicant.