TM 1-1520-253-23
4.16.3.7
Marking and Recording of Inspection Results. Mark and record the inspection results as required by
4.16.3.8
Demagnetization. With the switch remaining in the AC position, place the probe/yoke legs in the same
position used for magnetizing. Press the test switch and withdraw the probe/yoke from the part for a distance of two feet
before releasing the switch.
4.16.4 Backup Method. None required.
4.16.5 System Securing. Clean the landing gear axle thoroughly to remove all residual magnetic particle media. Refer
to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. If removed, install the landing gear axle in
accordance with the applicable technical manuals listed in Table 1-1.
4.17.1 Description (Figure 4-1. Index No. 17). The forward landing gear strut piston tube dampens up and down
movements during takeoff and landing to reduce structural fatigue.
4.17.2 Defects. Defects may occur anywhere on the surface of the strut piston tube. No cracks are allowed.
4.17.3 Primary Method. Magnetic Particle.
4.17.3.1
NDI Equipment and Materials. (Refer to Appendix B.)
a.
Magnetic Particle Inspection Probe/Yoke
b.
Magnetometer
c.
Black Light
d.
Fluorescent Magnetic Particles
e.
Consumable Materials, refer to Table 1-8
f.
Aircraft Marking Pencil, refer to Table 1-8
