Defects.

Inspection Procedure - TM-1-1520-265-23_121

TM-1-1520-265-23 H-60 Helicopter Series Manual
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TM 1-1520-265-23 2.22 TAIL ROTOR BLADE (VOIDS) (BT). 2.22.1 Description (Figure 2-1. Index No. 92). The tail rotor blade is built around two graphite composite spars running from tip-to-tip and crossing each other at the center to form the four blades. The blade spars are covered with cross ply fiberglass to form the airfoil shape. 2.22.2 Defects. Void damage may occur anywhere on both sides of the blade. NOTE A void is defined as an unbonded area that is supposed to be bonded. Many sub-definitions of voids are given, such as lack of adhesive, gas pocket, misfit, etc. However, this manual makes no distinction among these, instead grouping them all under one general term ("void"). 2.22.3 Primary Method. Bond Testing. 2.22.3.1 NDI Equipment and Materials. (Refer to Appendix B.) a. Bond Test Unit b. Probe, Mechanical Impedance Analysis c. Probe Holder d. Cable Assembly e. Test Block, metal honeycomb with skin thickness closest to that of the panel to be inspected. f. Test Block, Composite Defect Standard #1 g. Test Block, Composite Defect Standard #3 h. Teflon Tape, refer to Table 1-8 i. Aircraft Marking Pencil, refer to Table 1-8 2.22.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. 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, remove the tail rotor blade in accordance with applicable technical manuals listed in Table 1-1. 2.22.3.3 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. 2.22.3.4 Preparation of Part. The components shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4. 2-51

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