This industrial Standard for the aerospace sector has been drawn up under the responsibilit of AECMA.
AECMA PREN 2239-1999 history
1999AECMA PREN 2239-1999 Heat Resisting Steel FE-PA91-HT Solution Treated and Precipitation Treated Forgings Aerospace Series Edition 2 [Refer To: ASD-STAN PREN 4574]
1995AECMA PREN 2239-1995 Aerospace Series Heat Resisting Steel FE-PA4901 Solution and Precipitation Treated Forgings De Less Than or Equal to 100 mm Edition EN
1979AECMA PREN 2239-1979 Heat Resisting Steel FE-PA91-HT Solution Treated and Precipitation Treated Forgings Aerospace Series Edition 1