TM 1-1520-253-23
2.7.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. if required, the pitch
varying shaft bore liner shall be removed in accordance with the applicable technical manuals listed in Table 1-1.
2.7.3.3 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.
2.7.3.4 Preparation of Part.
The part shall be thoroughly cleaned.
Refer to Preparation of Part or Area for NDI,
2.7.3.5 NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
2.7.3.6 Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of possible
cracks. Positions for this inspection are illustrated in Figure 2-7.
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