Flight line static grounds should be tested to be less than how many ohms?

Flight line static grounds should be tested to be less than how many ohms?

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

Answer: (D)

Static grounding on the flight line needs a low impedance path to earth so any built‑up static charges can dissipate safely. If the grounding resistance is too high, charges may linger on the aircraft and discharge as a spark during fueling or maintenance, creating an ignition risk and electrical interference. The proper check is to measure the resistance from the aircraft bonding point to a known earth ground, and this path must be less than ten thousand ohms. When readings exceed that limit, inspect and clean bonding clamps, cables, and connections, and ensure a solid metal-to-metal contact and good earth contact; address corrosion, wear, or damaged wiring as needed. Keeping the ground path under ten thousand ohms ensures an effective discharge path under field conditions.

Static grounding on the flight line needs a low impedance path to earth so any built‑up static charges can dissipate safely. If the grounding resistance is too high, charges may linger on the aircraft and discharge as a spark during fueling or maintenance, creating an ignition risk and electrical interference. The proper check is to measure the resistance from the aircraft bonding point to a known earth ground, and this path must be less than ten thousand ohms. When readings exceed that limit, inspect and clean bonding clamps, cables, and connections, and ensure a solid metal-to-metal contact and good earth contact; address corrosion, wear, or damaged wiring as needed. Keeping the ground path under ten thousand ohms ensures an effective discharge path under field conditions.