SAE ARP 5316E:2018 pdf free

SAE ARP 5316E:2018 pdf free.Storage of Elastomer Seals and Seal Assemblies Which Include an Elastomer Element Prior to Hardware Assembly
Age control was imposed on elastomers used in critical sealing devices of aircraft hydraulic, lubricating, and fuel systems after World War II. Several different requirements and specifications were implemented in the years following the war until 1958 when ANA Bulletin 438 was released. This bulletin’s purpose was to collect all previous requirements for age control in one document and to make it easier for various agencies and contractors to effectively implement age control.
However, confusion in interpretations resulted in abuses, cost increases and inconsistently imposed exceptions.Many other programs were then undertaken to study age control. The results of many of these were summarized in the Air Force report, AFML-TR-67-235. The conclusion of the studies summarized in this report and others that were in progress was that the overall properties of elastomeric materials were much improved over the materials initially evaluated and age control should be made less restrictive. As a result of this information, MIL-STD-1 523 was released in 1973 and superseded ANA Bulletin 438. One of the basic requirements of the new document was to provide a cure date limitation of twelve quarters from cure date to acceptance of the seals by the original procuring activity, whether a government agency, a first or second contractor or an organization which assembles seal and hardware kits. In all cases, the use of cure date was intended to provide for good FIFO (First In- First Out) warehousing procedures.
On February 1, 1984, MIL-STD-1523A was issued to supersede MIL-STD-1523. This revision was targeted at eliminating the confusion in interpretation of the previous document. It also extended cure date requirements from 12 quarters to 40 quarters. MIL STD-1523A controlled the age of elastomers only at time of acceptance by the government. This meant that the cure date of each elastomer had to be known at the time a system was accepted by the government.SAE ARP 5316E pdf free download.