TM 1-1520-253-23
ROTOR HUB (MT).
2.5.1 Description (Figure 2-1. Index No. 5). The rotor hub contains splines that mate with the splines on the transmission
rotor shaft. Pitch shafts are connected to the hub through the three horizontal pins. These pins ride in bearings
supported by the hub lugs. Caps retaining the pins and bearings are secured by locking beams. The beams connect the
leading cap of one pin with the trailing cap of the next pin.
2.5.2 Defects. Defects may occur anywhere on the rotor hub surface. Particular attention shall be given to a one inch
area around underside splined area of the rotor hub. No cracks are allowed.
2.5.3 Primary Method. Magnetic Particle.
2.5.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a.
Magnetic Particle Inspection Probe/Yoke
b.
Magnetometer
c.
Black Light
d.
Fluorescent Magnetic Particles
e.
Consumable Materials, refer to Table 1-8
f.
Aircraft Marking Pencil, refer to Table 1-8
2-9
