TM 1-1520-265-23a.Place probe on a good area in the inspection location and null. Adjust phase as required to obtain horizontal lift-off.b.Inspect the part.c.Any signal similar to the notches in the test block are cause for rejection.NOTEEither probe identified in paragraph 5.4.3.1 may be used depending primarily on the ease ofaccessibility and user friendliness. If the probes are changed, steps 5.4.3.5 b. (1), (2), and (3)shall be repeated each time a change is made.5.4.3.7Marking and Recording of Inspection Results. Mark and record inspection results as required byparagraph 1.3.5.4.4BackupMethod.None required.5.4.5SystemSecuring. Not applicable.5.5 AFT ENGINE MOUNT STRUTS (IT).5.5.1Description(Figure5-1.IndexNo.5).The aft engine mount struts attach to fittings on the air frame andlinks attach to the engine.5.5.2Defects.Cracks may occur anywhere on the surface of the aft engine mount struts. No cracks areallowed.5.5.3PrimaryMethod. Magnetic Particle.5.5.3.1NDI Equipment and Materials. (Refer to Appendix B.)a.Magnetic Particle Inspection Probe/Yokeb.Magnetometerc.Black Lightd.Fluorescent Magnetic Particles, refer to Table 1-8e.Consumable Materials, refer to Table 1-8f.Aircraft Marking Pencil, refer to Table 1-8NOTEHand-held magnetic coil may be used. Refer to paragraph 1.4.8.1.2 and Figure 1-6.5.5.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. A partial inspection forcause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces of theinstalled part using applicable positions of this procedure. If required, the struts shall be removed in accordance with theapplicable technical manuals listed in Table 1-1.5-8
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