20-42 Fluorescent Penetrant Inspection
This specification provides for surface inspection of parts fabricated from nonmagnetic
materials to detect discontinuities open to the surface, such as cracks, cold shuts, laps,
porosity and other surface defects.
Applicable requirements and limitations of ASTM E 1417 shall apply. After inspection is
complete, solvent clean parts.
The step-by-step procedure and equipment used to perform the inspection shall be
accomplished per ASTM E 1417.
A. Inspection Criteria
Parts inspected by fluorescent penetrant method shall be accepted or rejected on basis
of acceptance limits specified. If acceptance limits are not specified, rejectable surface
defects and any of the following:
Cracks y
Seams y
Cold shuts or laps y
Surface inclusions y
In castings, aligned discontinuous surface indications other than cracks, cold shuts y
and inclusions are rejectable if more than 3/8 inch in length.
20-50 Corrosion Control
[Reserved].
20-60 Priming and Painting
WARNING
Refer to appropriate Material Safety Data Sheet (MSDS) and
take necessary safety precautions when working in proximity to
hazardous materials.
A. Priming
This specification outlines preparation and application requirements for primers. Primers
provide corrosion protection and a final finish or a base for the final finish.
25 OCT 2010 R66 Maintenance Manual Chapter 20 Standard Practices Page 20.13
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