TM 1-1520-264-23
Figure 4-20. Vertical Stabilizer Barrel Nuts
4.20.3.7
Marking and Recording of Inspection Results. Mark and record the inspection results as required by
paragraph 1.3.
4.20.3.8
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.
4.20.4
Backup Method. None required.
4.20.5
System Securing. Clean the vertical stabilizer barrel nuts thoroughly to remove all residual magnetic particle
media. Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The vertical stabilizer
requires installation in accordance with the applicable technical manuals listed in Table 1-1.
4.21 HORIZONTAL STABILATOR ACTUATOR FITTING (ET).
4.21.1
Description (Figure 4-1. Index No. 21)
. The horizontal stabilator actuator fitting is located on the horizontal
stabilator and provides a mounting point for the horizontal stabilator actuator.
4.21.2
Defects. Defects can occur anywhere on the surface of the actuator fitting. No cracks are allowed.
4.21.3
Primary Method. Eddy Current.
4.21.3.1
NDI Equipment and Materials. (Refer to Appendix B.)
a.
Eddy Current Inspection Unit
b.
Probe, straight, shielded surface, 100 KHz-500 KHz
c.
Probe, right angle, shielded surface, 100 KHz-500 KHz, 90°
1/2 inch drop
d.
Cable Assembly
4-49
