TM 1-1520-253-23
a.
Place probe on part in the 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 2.14.3.1 may be used depending primarily on the ease of
accessibility and user friendliness. If the probes are changed, steps 2.14.3.5 b. (1), (2), and (3)
shall be repeated each time a change is made.
2.13.3.7 Marking and Recording of Inspection Results. Mark and record as required by paragraph 1.3.
2.13.4 Backup Method. Fluorescent Penetrant, refer to paragraph 1.4.7.
2.13.5 System Securing. The ball spherical bearing requires installation as required in accordance with the applicable
technical manual listed in Table 1-1.
2.14.1 Description (Figure 2-1. Index No. 14). The weather protective cover is bolted to the drive collar flanges and
turns with the collar and shaft. The cover provides weather protection for the upper controls.
2.14.2 Defects. Void damage may occur on any area of the structure.
NOTE
A void is defined as an unbonded area that is supposed to be bonded. Many sub-definitions of
voids are given such as lack of adhesive, gas pocket, misfit, etc. However, this manual makes no
distinction among these, grouping them all under one general term ("void").
