TM 1-1520-265-23
6-20
Change 3
6.10.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
6.10.3.8 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.
6.10.4 Backup Method. None required.
6.10.5 System Securing. Clean the push-pull rods 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 push-pull rods, if removed, require installation in accordance with the applicable technical
manuals listed in Table 1-1.
6.11 NONFERROUS FLIGHT CONTROL SYSTEM PUSH-PULL RODS (ET).
6.11.1 Description (Figure 6-1, Index No. 11). This is a generic inspection pertaining to nonferrous
flight control system push-pull rods throughout the helicopter.
6.11.2 Defects. This inspection is used to verify crack indications found visually on the push-pull
rods. All areas where rework has been performed shall be inspected for cracks. No cracks are
allowed.
6.11.3 Primary Method. Eddy Current.
6.11.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a. Eddy Current Inspection Unit
b. Probe, straight, shielded surface, 2 MHz (Titanium)
c. Probe, right angle, shielded surface, 2 MHz, 90_ 1/2 inch drop (Titanium
d. Probe, Adapter)
e. Cable Assembly
f. Reference Block, three-notched Aluminum (0.008, 0.020, 0.040 EDM notches)
g. Reference Block, three-notched Titanium (0.008, 0.020, 0.040 EDM notches)
h. Teflon Tape, refer to Table 1-8
i. Aircraft Marking Pencil, refer to Table 1-8
6.11.3.2 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 this procedure. If required, the
nonferrous flight control system push-pull rods shall be removed in accordance with the applicable
technical manuals listed in Table 1-1.
6.11.3.3 Access. Not applicable.
6.11.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part
or Area for NDI, paragraph 1.4.4.
