Final answer:
The FAA must prove that the airman committed the violation.
Step-by-step explanation:
In order to win its case at a certificate appeal hearing, the FAA must prove that the airman committed the violation. This means that the FAA needs to provide evidence or demonstrate that the airman actually engaged in the behavior or action that is considered to be a violation according to the relevant regulations or laws. The burden of proof is on the FAA to establish the airman's guilt.