TM 1-1520-265-233-16Figure 3-7. O il Cooler Drive ShaftNOTEEither probe identified in paragraph 3.7.3.1 may be used depending primarily on theease of accessibility and user friendliness. If the probes are changed, steps 3.7.3.5b.(1), (2), and (3) shall be repeated each time a change is made.3.7.3.7 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.3.7.4 BackupMethod. None required.3.7.5 SystemSecuring. The oil cooler drive shaft, if removed, requires installation in accordancewith the applicable technical manuals listed in Table 1-1.3.8 OIL COOLER AXIAL FAN SHAFT (MT).3.8.1 Description(Figure3-1,IndexNo.8). The oil cooler axial fan shaft passes through and driesthe fan rotor. There are two configurations: one with an integral flange and one with aremoveable/companion flange and nut. This inspection is for the removable/companion flange type.3.8.2 Defects. Defects may occur anywhere on the surface of the oil cooler fan shaft. Thisinspection is to find cracks on the oil cooler axial fan shaft identified, at or around the cotter pin holes.No cracks are allowed.3.8.3 PrimaryMethod. Magnetic Particle.3.8.3.1 NDI Equipment and Materials. (Refer to Appendix B.)a. Magnetic Particle Inspection Probe/Yokeb. Magnetometerc. Black Lightd. Fluorescent Magnetic Particles, refer to Table 1-8e. Consumable Materials, refer to Table 1-8f. Aircraft Marking Pencil, refer to Table 1-8
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