https://www.scconline.com/blog/post/2022/12/17/kaar-maintenance-and-repair-services-of-test-bench-equipment-used-for-testing-air-worthiness-of-an-aircraft-does-not-qualify-to-be-an-aircraft-or-its-engine-or-other-aircra/
KAAR| Maintenance and repair services of test bench equipment used for testing air worthiness of an aircraft does not qualify to be an aircraft or its engine or other aircraft components