2.10 CENTRIFUGAL DROOP STOP BOLTS (MT).
2.10.1 Description (Figure 2-1. Index No. 10). The centrifugal droop stop bolts connect the balancing arms to the lugs
in the hub oil tank. This inspection is to verify any cracks found visually.
2.10.2 Defects. Defects may occur anywhere on the surface of the bolt. No cracks are allowed.
2.10.3 Primary Method. Magnetic Particle.
220.127.116.11 NDI Equipment and Materials. (Refer to Appendix B.)
Magnetic Particle Inspection Probe/Yoke
Fluorescent Magnetic Particles
18.104.22.168 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the centrifugal
droop stop bolts removed in accordance with the applicable technical manuals listed in Table 1-1.
22.214.171.124 Access. Not applicable.
126.96.36.199 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or
188.8.131.52 NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
184.108.40.206 Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of possible
cracks. Position required for this inspection is illustrated in Figure 2-10.
a. Select AC on the AC/DC power switch.
b. Place probe/yoke legs on part as shown.
c. Press the test switch and apply a light coat of magnetic particle media at the same time.
Remove the media momentarily before removing the current. Current should be applied for no more than
d. Inspect for cracks using the black light.