TM 1-1520-265-23
6.4 YAW PEDAL SUPPORT SHAFT (MT).
6.4.1 Description (Figure 6-1. Index No. 4). The yaw pedal support shaft supports the right and left pedal support
tubes. The support shaft provides the pivot point for the pedal support tubes.
6.4.2 Defects. Defects may occur anywhere on the surface of the yaw pedal support shaft. No cracks are allowed.
6.4.3 Primary Method. Magnetic Particle.
6.4.3.1 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.
6.4.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the yaw pedal
support shaft removed in accordance with the applicable technical manuals listed in Table 1-1.
6.4.3.3 Access. Not applicable.
6.4.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
6.4.3.5 NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
6.4.3.6 Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of possible
cracks. Positions required for this inspection are illustrated in Figure 6-4.
Figure 6-4. Yaw Pedal Support Shaft
6-7
