TM 1-1520-264-23
2.4.4
Backup Method. None required.
2.4.5
System Securing. None required.
2.5
MAIN ROTOR BLADE (PT).
2.5.1
Description (Figure 2-1. Index No. 5). The main rotor blade assemblies are rotating airfoils with swept tips that
are constructed of stainless steel and fiberglass. Each attaches to the main rotor head assembly by a lead lag link and a
blade attachment pin.
2.5.2
Defects. This inspection is used to verify crack indications found visually on the main rotor blade. No cracks are
allowed.
2.5.3
Primary Method. Fluorescent Penetrant.
2.5.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed in Table 1-7. MIL-1-25135
level 3 penetrant materials shall be selected from the approved list in Table 1-8.
2.5.3.2 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 main rotor blade shall be removed in accordance with the applicable
technical manuals listed in Table 1-1.
2.5.3.3 Access. Not applicable.
Maintenance Platforms/Workstands
Use only appropriate platforms, workstands, or other approved locally procured stands
and restraint equipment when working above 10 feet on helicopter in a nontactical
environment. Otherwise, personnel injury could result from accidental falls.
2.5.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
2.5.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to Fluorescent Penetrant Method,
paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 2-5.
2.5.3.6 Marking and Recording of Inspection Results. Mark and record the inspection results as required by paragraph
1.3.
2.5.4
Backup Method. None required.
2.5.5
System Securing. Clean the main rotor blade to remove inspection media. Refer to Post Cleaning and
Restoration of Part or Area After NDI, paragraph 1.4.16. The main rotor blade, if removed, requires installation in
accordance with the applicable technical manuals listed in Table 1-1.
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