The text of this standard , whick exists in thress equivalent versions has been drawn up under the responsibility of AECMA and has been circulated to Official Services. Any reservations expressed by Official Services and not resolved in this issue, have been incorporated in the history sheet which has accompanied this prEN to CEN.
AECMA PREN 2239-1979 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