TM 1-1520-253-23
3.6.3.6
Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 3-6.
a.
Place probe on part in the required inspection location and null.
Adjust phase as required to obtain
horizontal lift-off.
b.
Inspect the part.
c.
Any signal similar to the notches in the test block is cause for rejection.
NOTE
Either probe identified in paragraph 3.6.3.1 may be used depending primarily on
the ease of accessibility and user friendliness. If the probes are changed, steps
3.6.3.5 b. (1), (2), and (3) shall be repeated each time a change is made.
3.6.3.7
Marking and Recording of Inspection Results. Mark and record as required by paragraph 1.3.
3.6.4
Backup Method. Fluorescent Penetrant, refer to paragraph 1.4.7.
3.6.5 System Securing. If removed, install the driveshafting tubes in accordance with the applicable technical manual
listed in Table 1-1. Secure the engine driveshaft hinged panels.
ENGINE DRIVESHAFT (ONE PIECE) (ET).
3.7.1
Description (Figure 3-1. Index No. 7). The one piece engine driveshaft is an aluminum shaft with flanged ends.
3.7.2 Defects. Defects may occur anywhere on the surface of the driveshaft. All dents, scratches, nicks, or gouges
shall be inspected to ensure they do not conceal cracks. No cracks are allowed.
3.7.3
Primary Method. Eddy Current.
