TM 1-1520-265-234.12.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph1.3.4.12.4BackupMethod. None required.4.12.5SystemSecuring. The gunner's window and retainer assembly, if removed, require installation in accordancewith the applicable technical manuals listed in Table 1-1.4.13TROOP/CARGO DOOR LOWER TRACK (ET).4.13.1Description(Figure4-1.IndexNo.13). These rear sliding doors on either side of the helicopter cabin open tothe troop/cargo compartment. This inspection applies to the lower track on which the doors slide.4.13.2Defects. This inspection is used to verify crack indications found visually on the troop/cargo door lower track.No cracks are allowed.4.13.3PrimaryMethod. Eddy Current.4.13.3.1 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 1-84.13.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. A partial inspectionfor cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces ofthe installed part using this procedure. If required, the cargo door shall be removed in accordance with the applicabletechnical manuals listed in Table 1-1.4.13.3.3 Access. Not applicable.4.13.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.4.13.3.5 NDI Equipment Settings.a.Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-1 9e1.Frequency Fl- 200 KHzF2- offHdB- 57.0VdB- 69.0Rot- 56°4-32
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