This specification has been declared "CANCELLED" by the Aerospace Materials Division, SAE as of December 2008 and has been superseded by AMS 2644. The requirements of the latest issue of AMS 2644 shall be fulfilled whenever reference is made to the cancelled AMS 3156. By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Material Specifications, noting that it is superseded by AMS 2644.This specification covers a stable, non-corrosive oil or oil-like substance together with a dye or additives necessary to provide a water-washable, highly-penetrating fluorescent solution. Primarily for use in penetrant inspection of parts and assemblies for detection of surface discontinuities and imperfections.
