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General The guidelines for the adjustable sliding probes are similar to the fixed types, therefore much of the information that is given here follows the same sequence and detail and will look like repetition. This is done so that both technical bulletins are self contained and may be read independently, but is best to become familiar with the fixed probes first. Sliding probes have been named as such because they move over fasteners in the inspection area in a sliding motion. Conventionally, probes are used in 'spot probing' such as with a ring-encircling probe or moving a spot/surface probe around the periphery of a fastener. Sliding probes are eddy current probes operating in the reflection mode (transmit-receive). This means that the eddy currents are induced by the driver coil (transmitter) and detected by a separate pick up coil (receiver). With adjustable types, a spacer is inserted between the two coil bodies.

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Sliding probes are the fastest method to inspect large numbers of fastener holes for cracks. They are capable of detecting small defects in both the surface and subsurface layers. Download Naruto Impact Warcraft 3 Frozen Throne. Adjustable sliding probes are particularly well suited for finding subsurface cracks in thick multilayer structures, like wing skins. They differ with the fixed types in that they are most often moved at right angles to the crack direction (although the probe is turned 90 degrees) in what is called a 90 degree scan (see the Appendix). The sensitive area is located in the center of the probe between the coils and is directionally sensitive, so the engraved (normally green) 'detection' line must be kept in the direction of the expected cracks. Two types of scan are possible: one scan centralized over the heads or two side (tangential) scans, one in each side of fastener.

Surface and Subsurface Crack Detection Adjustable sliding probes are normally used for subsurface crack detection and rarely for surface cracks where the fixed sliding probes will normally have an advantage. Nevertheless there are some exceptions such as in the case of large or magnetic fasteners and/or if the crack growth direction is at 90 degrees to the fastener row.