AFT BELLCRANK (MT)

TM-1-1520-265-23 H-60 Helicopter Series Manual
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TM 1-1520-265-23 6.20.3.7. Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3. 6.20.3.8. Demagnetization. With the switch remaining in the AC position, place the probe/yoke legs in the same position used for magnetizing. Press the test switch and withdraw the probe/yoke from the part for a distance of two feet before releasing the switch. 6.20.4. Backup Method. None required. 6.20.5. System Securing. Clean the lateral bellcrank thoroughly to remove all residual magnetic particle media. Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The lateral bellcrank, if removed, requires installation in accordance with the applicable technical manuals listed in Table 1-1. 6.21. AFT BELLCRANK (MT). 6.21.1. Description (Figure 6-1. Index No. 21). The aft bellcrank, supported by the bellcrank support (bridge) in the swashplate linkage installation, transfers flight control movements through a connecting servo link to the main rotor swashplate. It is machined from a 4340 steel forging, cadmium plated, and protected by epoxy primer and polyurethane paint. 6.21.2. Defects. This inspection is used to verify crack indications found visually on the aft bellcrank. Inspect all reworked areas for cracks. Inspect aft bellcrank lug and rib surfaces. Visually inspect bellcrank flanged pivot bushings. No cracks are allowed. 6.21.3. Primary Method. Magnetic Particle. 6.21.3.1. 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 NOTE Hand-held magnetic coil may be used. Refer to paragraph 1.4.8.1.2 and Figure 1-6. 6.21.3.2. Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. A partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces of the installed part using applicable positions of this procedure. If required, the aft bellcrank shall be removed in accordance with the applicable technical manuals listed in Table 1-1. 6.21.3.3. Access. Not applicable. 6-41

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