FERROUS FLIGHT CONTROL SYSTEM PUSH-PULL RODS (MT).
Description (Figure 6-1. Index No. 19). This is a generic inspection pertaining to ferrous flight control system
push-pull rods throughout the helicopter.
6.19.2 Defects. This inspection is used to verify crack indications found visually on the flight control system push-pull
rods. No cracks are allowed.
Primary Method. Magnetic Particle.
NDI Equipment and Materials. (Refer to Appendix B.)
a. 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 220.127.116.11.2 and Figure 1-6.
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 parts using applicable positions of this procedure. If required, the flight control system push-pull
rods shall be removed in accordance with the applicable technical manuals listed in Table 1-1.
Access. Refer to Figure 1-4 and Table 1-2, as 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.
Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of
possible cracks. The position required for this inspection is illustrated in Figure 6-19.
Select AC on the AC/DC power switch.
Place probe/yoke on part in position 1 as shown.
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 five seconds.
Inspect for cracks using the black light.
Demagnetize before moving to the next position. Refer to paragraph 18.104.22.168.
Repeat steps a. through e. for other positions, as required.