A Lead Mechanic reports being threatened with job removal by his Manager if he did not perform a detailed inspection of an elevator tab control mechanism with a pending AD (Airworthiness Directive) on a B737-800; even after explaining to the Manager he was not trained and qualified to perform the job.

Narrative

Approximately four to six weeks ago; I was ordered to attend a group training session on our Maintenance Check job card given by a QA Inspector. The training lasted approximately five minutes. This was the first time the job card was assigned to a B-Check since I have been to that training. Because it is [an] inspection; it falls under the Inspector-Aviation Maintenance Technician job description. It should be accomplished by an Inspector; who is trained and qualified to perform the job. I state this because I do not feel qualified to perform inspections on systems or jobs that I may only see every six or more weeks at a time.Later; I was given a directive by my Manager to accomplish an Inspection that our QA Inspectors have been doing in the past. When I expressed my concerns to my Manager he threatened to pull my [company employee] badge and remove me from service if the job card was not completed by the end of the shift. The job card is a Maintenance Check Elevator Tab Control Mechanism- Detailed Inspection Pending AD (Airworthiness Directive). The Engineering Order [paperwork for the AD]; which is the same [type of] inspection; is a QA Inspection. As a Lead Mechanic that has the primary responsibility of the B-Check; I feel that I am too close to the Operation to do Inspection. We have a Quality Assurance department here; manned with Inspectors; right in this building.