TM 1-1520-265-234.24.3.6. Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 4-24.a.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 4.24.3.1 may be used depending primarily on the ease ofaccessibility and user friendliness. If the probes are changed, steps 4.24.3.5 b. (1), (2), and (3)shall be repeated each time a change is made.4.24.3.7. Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph1.3.4.24.4. BackupMethod. None required.4.24.5. SystemSecuring. The main landing gear shock strut upper cylinder, if removed, requires installation inaccordance with the applicable technical manuals listed in Table 1-1.4.25. MAIN LANDING GEAR SHOCK STRUT LOWER STAGE PISTON (MT).4.25.1. Description(Figure4-1.IndexNo.25). The shock strut consists of two pistons. The lower one absorbs thenormal landing loads.4.25.2. Defects. Defects may occur anywhere on the surface of the lower stage piston. Particular attention shall bedirected to the bearing bore lug. No cracks are allowed.4.25.3. PrimaryMethod. Magnetic Particle.4.25.3.1. NDI 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 1-6.4-58
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