TM 1-1520-265-236.3 TOEPEDALASSEMBLY(ET).6.3.1 Description(Figure6-1,IndexNo.3). The toe pedal assembly is attached to the pedal support assembly. Thetail rotor control pedals control the helicopter's directional headings.6.3.2 Defects.Defects may occur anywhere on the surface of the toe pedal assembly. No cracks are allowed.6.3.3 PrimaryMethod.Eddy Current.6.3.3.1NDI Equipment and Materials. (Refer to Appendix B.)a.Eddy Current Inspection Unitb.Probe, straight, shielded surface, 100 KHz-500 KHzc.Probe, right angle, shielded surface, 100 KHz-500 KHz, 90° 1/2 inch dropd.Cable Assemblye.Reference Block, three-notched aluminum (0.008, 0.020, 0.040 EDM notches)f.Teflon Tape, refer to Table 1-8g.Aircraft Marking Pencil, refer to Table 1-86.3.3.2Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. A partial inspectionfor cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces ofthe installed part using this procedure. If required, the toe pedal assembly shall be removed in accordance with theapplicable technical manuals listed in Table 1-1.6.3.3.3 Access. Access to the toe pedal assembly is from the cockpit area.6.3.3.4Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.6.3.3.5NDI Equipment Settings.a.Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e".Frequency F1- 200 KHz F2 - offHdB- 57.0VdB- 69.0Rot- 56°Probe drive- midLPF- 100HPF- 0H Pos- 80%V Pos- 20%b.Refer to Eddy Current Method, paragraph 1.4.11. Set up on test block as follows:(1)Null probe on test block.(2)Adjust phase as required to obtain horizontal lift-off.(3)Move probe over all three notches in test block. Adjust gain to obtain a three block vertical signal whenprobe is passed over 0.040-inch notch in test block. (See the standard instrument display shown in Figure1-7.)6-5
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