This specification has been declared "CANCELLED " by the Aerospace materials Division, SAE, as of April 2009, and has been superseded by AMS3138D. The requirements of the latest issue of AMS3138D shall be fulfilled whenever reference is made to the cancelled AMS3138/1B. By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Material Specifications, noting that it has been superseded by AMS3138D. Cancelled specifications are available from SAE.