What does a loop test in an electrical system verify?

• A. A test that checks the continuity and functionality of an electrical loop to ensure no open or shorted paths.
• B. A test of the aircraft's fuel system integrity.
• C. A test of hydraulic pressure stability.
• D. A test of communications link reliability.

Answer: (A)

This test focuses on the integrity of an electrical circuit loop. It verifies that the path from the power source through all conductors to the load and back is continuous and that there are no unintended parallel paths (shorts) that would bypass the load or cause excessive current. By checking continuity and the loop’s resistance, you confirm a proper closed circuit; an open appears as infinite resistance, while a short shows up as abnormally low resistance. In aviation maintenance, you perform this with power removed to ensure the loop can carry current as designed and that there are no opens or shorts within the circuit. The other options relate to fuel, hydraulic, or communications systems and do not assess electrical loop continuity.