TM 1-1520-265-23Figure 2-22. Tail Rotor Blade (Voids)NOTEThe basic set-up provided above also selects a frequency that provides a satisfactory inspectionfor voids associated with skin-to-spar, skin-to-trailing edge, doubler-to-doubler and doubler-to-skin, and trim tab bonding.b.Use the NULL and GAIN adjustments to reset the ACTIVE screen for the areas to be inspected (do not go backto SET mode). Also, compare similar areas. For example, to check for spar to skin voids, check front and backof blade in the same area, or check another blade in the same area. Observe that, when moving the probechordwise from the spar to the trailing edge, the transitions at the spar-to-honeycomb and the honeycomb-to-trailing edge strip are easily detected. When inspecting these areas, adjust the NULL and GAIN and move theprobe carefully along the transition using a straight edge or other guide. A localized phase and amplitude shiftsimilar to the test block indicates a void.2.22.3.7 Marking and Recording of Inspection Results. Mark and record as required by paragraph 1.3.NOTEAttention shall be directed to accurately mark the boundaries of all voids. These markings willbe needed to determine acceptance or rejection criteria in accordance with applicable technicalmanuals.2.22.4 Backup Method. None required.2.22.5 System Securing. The tail rotor blade, if removed, requires installation in accordance with the applicable technicalmanual listed in Table 1-1.2-53
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