Flight line certified static grounds should be tested to the required standard of how many ohms?

Flight line certified static grounds should be tested to the required standard of how many ohms?

• A. Less than 1,000 Ohms
• B. Less than 5,000 Ohms
• C. Less than 10,000 Ohms
• D. Less than 50,000 Ohms

Answer: (C)

Grounding for static electricity needs a path to earth that lets charges dissipate quickly. For flight-line certified static grounds, the resistance to earth should be under 10,000 ohms. The reason is straightforward: if the resistance is too high, static charges on aircraft surfaces and fueling equipment won’t drain promptly, increasing the chance of a spark in hazardous environments. A limit of less than 10,000 ohms balances practicality in field conditions with the safety need to minimize arcing during fueling and maintenance. In practice, tests are done with a suitable tester to confirm the ground path from the grounding point to earth remains at or below this threshold, keeping clamps clean and connections tight. Values tighter than 10,000 ohms (like under 1,000 or under 5,000) would be more stringent than standard field requirements, while a limit as high as 50,000 ohms would not reliably prevent static buildup.

Grounding for static electricity needs a path to earth that lets charges dissipate quickly. For flight-line certified static grounds, the resistance to earth should be under 10,000 ohms. The reason is straightforward: if the resistance is too high, static charges on aircraft surfaces and fueling equipment won’t drain promptly, increasing the chance of a spark in hazardous environments. A limit of less than 10,000 ohms balances practicality in field conditions with the safety need to minimize arcing during fueling and maintenance. In practice, tests are done with a suitable tester to confirm the ground path from the grounding point to earth remains at or below this threshold, keeping clamps clean and connections tight. Values tighter than 10,000 ohms (like under 1,000 or under 5,000) would be more stringent than standard field requirements, while a limit as high as 50,000 ohms would not reliably prevent static buildup.