This standard specifies the characteristics of thrust wire for securing the swivel nuts onto tees and ellbows, intended for use in aircraft pipe lines.
AECMA PREN 3271-1994 history
1994AECMA PREN 3271-1994 Aerospace Series Pipe Coupling 8 Degree 30' Thrust Wire Edition P 2; [Replaced By: ASD-STAN PREN 4032]