During a reserve repack, a Federal Aviation Administration Senior Rigger discovered this misrouted reserve static line on a rig used by the drop zone for student jumps and as a rental. At some point, someone created this routing error by disconnecting the RSL from the riser, passing it under the reserve riser and then reconnecting it to the main riser.
With the RSL routed in this fashion, if a jumper pulled the cutaway handle in an attempt to release the main canopy during a malfunction, the RSL would likely have remained trapped under the reserve riser and would not have been able to pull the reserve ripcord. With both risers released, the main canopy would then be connected and towed behind the jumper by the RSL. If the jumper had then pulled the reserve ripcord, it would most likely have released the RSL, but it is possible that the main and reserve would have entangled.
As part of their gear checks before each jump, skydivers should check their RSLs to ensure that they are correctly routed. There should be a clear path from the snap shackle to the reserve ripcord cable.