TM 1-1520-265-23
2.2.5 System Securing. Clean the split cones to remove inspection media. Refer to Post Cleaning and Restoration of
Part or Area After NDI, paragraph 1.4.16. The split cones require installation in accordance with the applicable technical
manuals listed in Table 1-1.
2.3
FERROUS ROTOR SYSTEM BOLTS AND PINS (MT).
2.3.1 Description (Figure 2-1. Index No. 3). This inspection is peculiar to all ferrous bolts and pins contained within
the rotor system.
2.3.2 Defects. Defects may occur anywhere on the surface of the bolt. No cracks are allowed.
2.3.3 Primary Method. Magnetic Particle.
2.3.3.1 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
NOTE
Hand-held magnetic coil may be used. Refer to paragraph 1.4.8.1.2 and Figure 1-6.
2.3.3.2
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the bolts or
pins removed in accordance with the applicable technical manuals listed in Table 1-1.
2.3.3.3
Access. Not applicable.
2.3.3.4
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
2.3.3.5
NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
2.3.3.6
Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of
possible cracks. The position required for this inspection is illustrated in Figure 2-3.
Figure 2-3. Ferrous Rotor System Bolts and Pins
2-6
