Final answer:
The authority code used on an accession PAR (Personnel Action Request) form is the SF-50.
Step-by-step explanation:
The authority code used on an accession PAR (Personnel Action Request) form is the SF-50. The SF-50 is a standardized form used by federal agencies to document personnel actions such as appointments, promotions, and changes in position or status. It includes information such as the agency code, pay plan, grade, and step of the employee.