Candidates must be notified in writing of the applicable probationary period before commencing employment. Probationary employees excluded: New employees who are serving a required probationary period have no protection under.This is your application for a Certificate of Relief from Disabilities or for a Certificate of Good Conduct. Please review this information carefully. A probationary period may be extended in certain circumstances. When filling out your application, keep the announcement in front of you. How long will probation last? Can I be fired during probation? An employee may be terminated at any time during the probation period. Congratulations on wanting to become a New York City Firefighter.