TM 1-1520-265-23
3-16
Figure 3-7. O il Cooler Drive Shaft
NOTE
Either probe identified in paragraph 3.7.3.1 may be used depending primarily on the
ease 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 as
required by paragraph 1.3.
3.7.4 Backup Method. None required.
3.7.5 System Securing. The oil cooler drive shaft, if removed, requires installation in accordance
with the applicable technical manuals listed in Table 1-1.
3.8 OIL COOLER AXIAL FAN SHAFT (MT).
3.8.1 Description (Figure 3-1, Index No. 8). The oil cooler axial fan shaft passes through and dries
the fan rotor. There are two configurations: one with an integral flange and one with a
removeable/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. This
inspection 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 Primary Method. Magnetic Particle.
3.8.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a. Magnetic Particle Inspection Probe/Yoke
b. Magnetometer
c. Black Light
d. Fluorescent Magnetic Particles, refer to Table 1-8
e. Consumable Materials, refer to Table 1-8
f. Aircraft Marking Pencil, refer to Table 1-8
