High Current Bond
All aircraft include a Ground Bonding circuit to enable the dissipation of current in the event of lightning strike. The resistance path and integrity of this complete circuit is critical to the safety of the aircraft.
MK test systems provide a High Current Bond Test system that tests the resistance across every bonded joint in the Ground circuit, at currents ranging from 5A up to 350A. Tests are carried out automatically. The test system power output is connected to the aircraft structure, enabling current to flow through the structure.
Test points are then connected across each joint and the volt drop measured and logged. The test programme dictates the current required for each measurement, and controls the pass and fail criteria. The migration towards the use of Composite materials in airframe construction has increased the focus on ensuring a robust and reliable ground circuit, and the importance of testing that circuit.
The increasing use of non-metallic materials such as composites – notably in aircraft production – has made bonding between metallic components a more vital issue than previously. An aircraft lightning strike, for example, can no longer simply dissipate across the metal of a fuselage, and needs to be more carefully managed.
MK Test’s high current bond testing typically applies between 5 Amps and 250 Amps, depending on the application and performance specification, enabling every joint across a structure to be tested for the passage of current. Please contact MK for details and options specific to High Current Bond Testing.