The applicability of FAR 121.377 is not eliminated by a person's performing a mix of work such as you describe. Such an interpretation would defeat the purpose of the regulation which is to insure that person's performing part 121 maintenance or preventive maintenance are provided relief from duty.
The cause of rheumatoid arthritis is unknown, although it appears to be an autoimmune disease. When the body's immune system does not operate as it should, white blood cells that normally attack bacteria or viruses attack healthy tissue instead â in this case, the synovium, or joint tissue.
What Is Rheumatoid Arthritis (RA)? Rheumatoid arthritis is an immune system condition, or âautoimmune disorder,â that causes inflammation of the lining of the joints. It may also affect the skin, eyes, lungs, heart, blood, and nerves. Although RA symptoms can come and go, the disease can worsen over time and may never go away.