TM 1-1520-265-23
2.26.3.2 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 tail rotor pitch control rods shall be
removed in accordance with the applicable technical manuals listed in Table 1-1.
2.26.3.3 Access. Not applicable.
WARNING
Maintenance Platforms/Workstands Use only appropriate platforms, workstands, or other
approved locally procured stands and restraint equipment when working above 10 feet on
helicopters in a nontactical environment. Otherwise, personnel injury could result from
accidental falls.
2.26.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
2.26.3.5 NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
2.26.3.6 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 2-26.
a.
Select AC on the AC/DC power switch.
b.
Place probe/yoke on part in position 1 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 five seconds.
d.
Inspect for cracks using the black light.
2.26.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3.
2.26.3.8 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.
2.26.4 Backup Method. None required.
2.26.5 System Securing. Clean the tail rotor pitch control rod ends 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 tail rotor pitch control
rod ends, if removed, require installation in accordance with the applicable technical manuals listed in Table 1-1.
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