The RSL AKA: Stevens cutaway system, was invented by Perry Stevens in the early 60,s. Mr. Stevens consulted with the FAA regarding their approval for his system. Because the system does not interfere with operation nor does it alter airworthiness The FAA advised approval was not necessary. It falls under the "extra equipment category". AS 8015 b provides 4 tests with the RSL actuating the reserve pack "if the RSL is provided as a part of the assembly. All systems in common use today provide for user defeat at any time. AS 8015b provides no qualification tests with an RSL disconnected and unconstrained. Master Rigger