TM 1-1520-265-23Figure 6-18. Walking Beam6.18.4 BackupMethod.None required.6.18.5 SystemSecuring.Clean the walking beam thoroughly to remove all residual magnetic particle media. Refer toPost Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The walking beam, if removed, requiresinstallation in accordance with the applicable technical manuals listed in Table 1-1.6.19 FORWARD BELLCRANK (MT).6.19.1 Description(Figure6-1,IndexNo.19).The forward bellcrank, supported by the bellcrank support (bridge) inthe swashplate linkage installation, transfers flight control movements through a connecting servo link to the main rotorswashplate. It is machined from a 4340 steel forging, cadmium plated, and protected by epoxy primer and polyurethanepaint.6.19.2 Defects.This inspection is used to verify crack indications found visually on the forward bellcrank. Inspect allreworked areas for cracks. Inspect forward bellcrank lug and rib surfaces. Visually inspect bellcrank flanged pivotbushings. No cracks are allowed.6.19.3 PrimaryMethod. Magnetic Particle.6.19.3.1NDI Equipment and Materials. (Refer to Appendix B.)a.Magnetic Particle Inspection Probe/Yokeb.Magnetometer6-37
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