Figure 1-8. Typical Metal Sorting Display

Figure 1-7. Signatures of EDM Notches in Test Block

TM-1-1520-265-23 H-60 Helicopter Series Manual
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TM 1-1520-265-23 Change 2 1-35 Figure 1-8. Typical Metal Sorting Display 1.4.12 Ultrasonic (UT) Method. NOTE Ultrasonic inspection shall be performed in accordance with the general application and techniques in TM 1-1500-335-23 (Nondestructive Inspection Methods manual) and the specific requirements of this manual. Ultrasonic inspection uses high frequency sound waves as a probing medium to provide information as to the state of various materials. this method is effective for the inspection of most metals for surface and subsurface damage. The method requires that at least one surface of the part be accessible for transducer contact in the vicinity of the area to be examined. The inspection is accomplished by inducing the ultrasound into the part by coupling the transducer to the part and picking up reflections of this sound from within the part. Any marked changes in acoustic properties, defect, interface, or back surface will reflect sound back to the transducer. The detected ultrasonic reflections are electronically displayed on a Cathode Ray Tube (CRT) and interpreted for indications of defects. Accessory wedges can be used to provide adequate transducer mating to curved surfaces or to change the angle of the sound beam and wave of mode propagation. 1.4.12.1 Safety Precautions During Ultrasonic Inspection. Follow safety precautions and instructions contained in this manual and the Nondestructive Inspection Methods manual listed in Table 1-1.

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