TM 1-1520-264-23
2.25 TAIL ROTOR BLADE (PT).
2.25.1
Description (Figure 2-1. Index No. 25). The tail rotor blade assemblies are rotating airfoils. The blade is
constructed with a stainless steel leading edge. Eleven aluminum honeycomb stiffeners are bonded into the spar, and
the blade skin is aluminum with bonded doublers near the root fitting.
2.25.2
Defects. Defects can occur anywhere on the surface of the tail rotor blade. No cracks are allowed.
2.25.3
Primary Method. Fluorescent Penetrant.
2.25.3.1
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.
2.25.3.2
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 tail rotor blade shall be removed in accordance with the applicable
technical manuals listed in Table 1-1.
2.25.3.3
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.
2.25.3.4
Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
2.25.3.5
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 2-25.
Figure 2-25.
Tail Rotor Blade
2-57
