MAIN LANDING GEAR SHOCK STRUT SUPPORT (MT).
Description (Figure 4-1. Index No. 10). The main landing gear shock strut support mounts the main landing
gear shock strut to the fuselage. Left and right units are similar.
Defects. This inspection is used to verify crack indications found visually on the main landing gear shock strut
support. No cracks are allowed.
Primary Method. Magnetic Particle.
NDI Equipment and Materials. (Refer to Appendix B.)
Magnetic Particle Inspection Probe/Yoke
Fluorescent Magnetic Particles, refer to Table
Consumable Materials, refer to Table 1-8
Aircraft Marking Pencil, refer to Table 1-8
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the main
landing gear shock strut support removed in accordance with the applicable technical manuals listed in Table 1-1.
Access. Not applicable.
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of
possible cracks. Positions required for this inspection are illustrated in Figure 4-10.
Select AC on the AC/DC power switch.
Place probe/yoke on part in position 1 as shown.
Press the test switch and apply a light coat of magnetic particle media at the same time.
Remove the media momentarily before removing the current. Current should be applied for no more than five
Inspect for cracks using the black light.
Demagnetize before moving to the next position. Refer to paragraph 188.8.131.52.
Repeat steps a. through e. for positions 2 through 5.
Marking and Recording of Inspection Results. Mark and record the inspection results as required by