Private Pilot Airman Certification Standards (ACS)Guided Flight Discovery Private Pilot Airplane Airman Certification Standards (ACS) provides the necessary information of what a private pilot applicant needs to know, consider, and do in order to qualify for a Private Pilot certificate. This text discusses the aeronautical knowledge, risk management, and flight proficiency standards required to pass the practical test for a private pilot certificate in single and multi engine land and sea class