TM 1-1520-264-23
Figure 2-20. Main Rotor Lower Shoe
2.21
MAIN ROTOR HEAD HUB LOAD PLATE (MT).
2.21.1
Description (Figure 2-1. Index No. 21). The main rotor head hub load plate provides a mounting surface for the
main rotor hub.
2.21.2
Defects. This inspection is used to verify crack indications found visually on the main rotor head hub load plate.
No cracks are allowed.
2.21.3
Primary Method. Magnetic Particle.
2.21.3.1
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
2.21.3.2
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the main rotor
head hub load plate shall be removed in accordance with the applicable technical manuals listed in Table 1-1.
2-49
