Fluorescent Penetrant (PT) Method

Figure 1-5. Bond Testing Reference Block Displays

Table 1-3. Penetrant Procedure (Type I, Method A)

TM-1-1520-265-23 H-60 Helicopter Series Manual
Page Navigation
20

TM 1-1520-265-23 Change 2 1-21 Mechanical vibration energy generated by resonance test equipment can be measured, analyzed by the tester, then displayed on a screen. There are several ways this energy can be applied to material and then be analyzed. Because bonded metallic and composite material properties differ substantially, no one test method will detect flaws in all types of material. For this reason, current bond testing equipment incorporates at least one or more of the aforementioned features. 1.4.6.2 Safety Precautions During Bond Testing. Follow safety precautions and instructions contained in this manual and the Nondestructive Inspection Methods manual listed in Table 1-1. WARNING Electrical equipment shall not be operated in areas where combustible gases or vapors may be present, unless the equipment is explosion proof. a. If instrument is operated using AC power, use a grounded power cord. b. Turn power OFF before connecting or disconnecting probe cable or power cable. 1.4.7 Fluorescent Penetrant (PT) Method. NOTE Fluorescent penetrant inspections shall be performed in accordance with the general applications and techniques in TM 1-1500-335-23 (Nondestructive Inspection Methods manual) and the specific requirements of this technical manual. The basic purpose of fluorescent penetrant inspection is to increase the visible contrast between a discontinuity and its background. This method is performed by applying a fluorescent penetrant solution to the inspection area which enters the surface opening of the discontinuity. The area is then wiped or rinsed and a developer is added to draw the fluorescent material from the discontinuity. A flaw or crack in the part will then become visible under the influence of ultraviolet light (black light). This method is effective for detecting surface flaws in forgings, castings, extrusions, formed sections, webs, and skins of materials. The penetrant method of inspection requires that the surface of the inspection area be thoroughly cleaned. Paint on the part must be removed before inspection. CAUTION Penetrant-Emulsifier/Remover Combinations (lipophilic/hydrophilic) from one manufacturer may not be mixed or used in conjunction with materials from a different manufacturer. Four penetrant procedures are given in Tables 1-3, 1-4, 1-5, and 1-6. All four inspections shall be conducted using fluorescent penetrant, AMS 2644, Type I, Method A, B, C, or D, Sensitivity Level 3 or 4. Refer to the Nondestructive Inspection Methods manual listed in Table 1-1 for more detailed instructions. Table 1-5 describes the procedure for using Type I, Method C, Level 3 or 4 on a removed part or parts attached either to a component or to the helicopter. This procedure supports the accomplishment of fluorescent penetrant inspection at the AVUM and AVIM levels regardless of geographic location. Therefore, the procedure in Table 1-5 will be the one most frequently referred to in this manual. Table 1-7 lists the equipment and Table 1-8 lists the fluorescent penetrant materials to be used.

Privacy Statement
Press Release
Contact