TM 1-1520-265-234-4 Change 34.2 AIRFRAME SKIN, PANELS, DOORS, COVERS, AND FAIRINGS - METAL (ET).4.2.1 Description(Figure4-1,IndexNo.2). This inspection is applicable to all skins, panels,doors, covers, and fairings constructed of nonferrous metallic material throughout all airframesections of this helicopter.4.2.2 Defects. This inspection is used to verify crack indications found visually on the part beinginspected. No cracks are allowed.4.2.3 PrimaryMethod. Eddy Current.4.2.3.1 NDI Equipment and Materials. (Refer to Appendix B.)a. Eddy Current Inspection Unitb. Probe, straight, shielded surface, 2 MHz (Titanium)c. Probe, right angle, shielded surface, 2 MHz, 90_ 1/2 inch drop (Titanium)d. Probe, Adaptere. Cable Assemblyf. Reference Block, three-notched aluminum (0.008, 0.020, 0.040 EDM notches)g. Reference Block, three-notched titanium (0.008, 0.020, 0.040 EDM notches)h. Reference Block, three-notched magnesium (0.008, 0.020, 0.040 EDM notches)i. Teflon Tape, refer to Table 1-8j. Aircraft Marking Pencil, refer to Table 1-84..2.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance.A partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) maybe performed on all exposed surfaces of the part using this procedure. If required, the airframe skin,panels, doors, covers, and fairings - metal shall be removed in accordance with the applicabletechnical manuals listed in Table 1-1.4.2.3.3 Access Not applicable.WARNINGMaintenance Platforms/WorkstandsUse only appropriate platforms, workstands, or other approved locally procuredstands and restraint equipment when working above 10 feet on helicopters in anontactical environment. Otherwise, personnel injury could result from accidentalfalls.4.2.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part orArea for NDI, paragraph 1.4.4.
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