TM 1-1520-265-234.27.3.7. Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph1.3.4.27.3.8. Demagnetization. With the switch remaining in the AC position, place the probe/yoke legs in the same positionused for magnetizing. Press the test switch and withdraw the probe/yoke from the part for a distance of two feet beforereleasing the switch.4.27.4. BackupMethod. Fluorescent Penetrant, refer to paragraph 1.4.7.4.27.5. SystemSecuring. Clean the main landing gear brake thoroughly to remove all residual magnetic particle media.Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The main landing gear brakerequires assembly and installation in accordance with the applicable technical manuals listed in Table 1-1.4.28. MAIN LANDING GEAR BRAKE HOUSING (ET).4.28.1. Description(Figure4-1.IndexNo.28). The main landing gear brakes are self-adjusting, double disc, three-cavity brake assembly, which includes a visual-brake lining wear indicator. The housing contains the pistons.4.28.2. Defects. Defects may occur anywhere on the surface of the main landing gear brake housing. No cracks areallowed.4.28.3. PrimaryMethod. Eddy Current.4.28.3.1. NDI 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, 900 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 1-84.28.3.2. Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the brakeassembly removed and disassembled in accordance with the applicable technical manuals listed in Table 1-1.4.28.3.3. Access. Not applicable.4.28.3.4. Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.4-66
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