TM 1-1520-265-234.7.3.3Access. Remove the drag beam support fairing.4.7.3.4Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.4.7.3.5Inspection Procedure. Perform fluorescent penetrant inspection. Refer to Fluorescent Penetrant Method,paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 4-7.4.7.3.6Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph1.3.4.7.4BackupMethod. None required.4.7.5SystemSecuring. Clean the roll vibration absorber to remove inspection media. Refer to Post Cleaning andRestoration of Part or Area After NDI, paragraph 1.4.16. The roll vibration absorber, if removed, requires installation inaccordance with the applicable technical manuals listed in Table 1-1.4.8ALUMINUM STRUCTURAL BEAMS AND FRAMES (ET).4.8.1Description(Figure4-1,IndexNo.8). The primary airframe structure is aluminum alloy. This procedure canbe used on all-aluminum beams and frames as well as aluminum skin panels and doors.4.8.2Defects. This inspection is used to verify crack indications found visually on the aluminum structural beamsand frames. No cracks are allowed.4.8.3PrimaryMethod. Eddy Current.4.8.3.1NDI Equipment and Materials. (Refer to Appendix B.)a.Eddy Current Inspection Unitb.Probe, straight, shielded surface, 100 KHz-500 KHzc.Probe, right angle, shielded surface, 100 KHz-500 KHz, 90° 1/2 inch dropd.Cable Assemblye.Reference Block, three-notched aluminum (0.008, 0.020, 0.040 EDM notches)f.Teflon Tape, refer to Table 1-8g.Aircraft Marking Pencil, refer to Table 1-84.8.3.2Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance in accordance withthe applicable technical manuals listed in Table 1-1.4.8.3.3Access. Generally easily accessed. If required, see Figure 1-4 and Table 1-2.4.8.3.4Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.4-19
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business