TM 1-1520-253-23
Figure 3-3. Driveshaft Adapters (Steel)
3.4.3
Primary Method. Eddy Current.
a.
Eddy Current Inspection Unit
b.
Probe, straight, shielded surface, 100 KHz-500 KHz
c.
Probe, right angle, shielded surface, 100 KHz-500 KHz, 901/2 inch drop
d.
Cable Assembly
e.
Reference Block, three-notched aluminum (0.008, 0.020, and 0.040 EDM notches)
f.
Teflon Tape, refer to Table 1-8
g.
Aircraft Marking Pencil, refer to Table 1-8
3.4.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. Partial inspection for
cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces of the
installed part using this procedure. If required, the forward driveshafting tubes shall be removed in accordance with the
applicable technical manuals listed in Table 1-1.
3.4.3.3
Access. Access is through the cabin crown tunnel covers. See Figure 1-4 - CH-47: 8; MH-47:3.
