TM 1-1520-253-23
AFT DRIVESHAFTING TUBES (ET).
3.5.1 Description (Figure 3-1. Index No. 5). The aft driveshafting transmits torque from the combining transmission to
the aft transmission. It consists of two individual shafts coupled by an adapter assembly. The two shafts are numbered 8
and 9 to continue the numbering of the forward driveshafting.
3.5.2 Defects. Defects may occur anywhere on the surface of the tubes. All dents, scratches, nicks, or gouges shall
be inspected to ensure they do not conceal cracks. No cracks are allowed.
3.5.3
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
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
