TM 1-1520-265-23
Figure 3-9. Oil Cooler Fan Blades
3.9.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3.
3.9.4 Backup Method. None required.
3.9.5 System Securing. The oil cooler fan, if removed, requires installation in accordance with the applicable technical
manuals listed in Table 1-1.
3.10 TAIL GEARBOX (ET).
3.10.1 Description (Figure 3-1. Index No. 10). The tail gearbox is mounted at the top of the pylon. It holds the tail rotor
head 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 to
the mounting point area. Also, all areas where rework has been performed shall be inspected for cracks. No cracks are
allowed.
3.10.3 Primary Method. Eddy Current.
3.10.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a.
Eddy Current Inspection Unit
b.
Probe, straight, shielded surface, 100 KHz-500 KHz
c.
Probe, right angle, shielded surface, 100 KHz-500 KHz, 900 1/2 inch drop
d.
Cable Assembly
3-20
