I was fired from an aircraft maintanance facility for not meeting their expectation. They expected me to mokify and repair avinics equipment on several diffrent types of aircraft. I do not have a license nor do I have a certificate to work on these aircraft. Federal aviation regulation ยง 43.3 par. d states. (d) A person working under the supervision of a holder of a mechanic or repairman certificate may perform the maintenance, preventive maintenance, and alterations that his supervisor is authorized to perform, if the supervisor personally observes the work being done to the extent necessary to ensure that it is being done properly and if the supervisor is readily available, in person, for consultation. However, this paragraph does not authorize the performance of any inspection required.