Eighth grade. Must possess a Universal Certificate of Completion in a Refrigerant Transition and Recovery Certification Program recognized by the Environmental Protection Agency (EPA). Must possess a Miami-Dade County Certificate of Competency as a Master Mechanic in Refrigeration and/or Air-Conditioning. Applicants qualifying for employment with the Miami-Dade Aviation Department will be subject to extensive security screening, including but not limited to fingerprint checks, employment verification and such other procedures as may be mandated by Federal law. The security clearance required by the Federal law is a continuing condition of employment.