This specification covers a centrifugally-cast, alloyed iron in the form of sleeves for the fabrication of piston rings. Primarily for use as top compression rings in aircraft piston engines. Rings usually require chromium plating for compatibility with the cylinder barrel material.
RATIONALE AMS7311H has been stabilized as mature technology. STABILIZATION NOTICE AMS7311H has been declared "STABILIZED" by AMS Committee X. This document will no longer be updated and may no longer represent standard industry practice. This document was stabilized because this document contains mature technology that is not expected to change and thus no further revisions are anticipated. Previously this document was reaffirmed non-current. The last technical update of this document occurred in October 1990. Users of this document should refer to the cognizant engineering organization for disposition of any issues with reports/certifications to this specification; including exceptions listed on the certification. NOTE: In many cases, the purchaser may represent a sub tier supplier and not the cognizant engineering organization.