Marking and Recording of Inspection Results. Mark and record the inspection results as required by
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.
4.12.4 Backup Method. None required.
System Securing. Clean the rotor support mixer assembly and mounting surfaces 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 rotor support mixer assembly, if removed, requires installation in accordance with the applicable technical manuals
listed in Table 1-1.
ROTOR MIXER SUPPORT ASSEMBLY BOLT (MT).
Description (Figure 4-1, Index No. 13).
The rotor mixer support bolt is found on the underside of the rotor
support mast support base.
Defects. This inspection is used to verify crack indications found visually on the rotor support mixer assembly
bolt. No cracks are allowed.
Primary Method. Magnetic Particle.
NDI Equipment and Materials. (Refer to Appendix B.)
Magnetic Particle Inspection Probe/Yoke
Fluorescent Magnetic Particles, refer to Table 1-8
Consumable Materials, refer to Table 1-8
Aircraft Marking Pencil, refer to Table 1-8
Hand-held magnetic coil may be used. Refer to paragraph 188.8.131.52.2 and Figure 1-6.
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the rotor mixer
support bolt removed in accordance with the applicable technical manuals listed in Table 1-1.
Access. Not applicable.
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.