TM 1-1520-265-23Figure 3-9. Oil Cooler Fan Blades3.9.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3.3.9.4 BackupMethod. None required.3.9.5 SystemSecuring. The oil cooler fan, if removed, requires installation in accordance with the applicable technicalmanuals listed in Table 1-1.3.10 TAIL GEARBOX (ET).3.10.1 Description(Figure3-1.IndexNo.10). The tail gearbox is mounted at the top of the pylon. It holds the tail rotorhead and changes the direction of the drive.3.10.2 Defects. Defects may occur anywhere on the surface of the tail gearbox. Particular attention should be given tothe mounting point area. Also, all areas where rework has been performed shall be inspected for cracks. No cracks areallowed.3.10.3 PrimaryMethod. Eddy Current.3.10.3.1 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 Assembly3-20
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