Reserve static line
Encyclopedia
A reserve static line, occasionally called a Stevens Lanyard, is a device that automatically opens the reserve parachute container when the main parachute is cut-away
Cut-away
Cut-away is a skydiving term referring to disconnecting the main parachute from the harness-container in case of a malfunction in preparation for opening the reserve parachute...

. The RSL is a lanyard connecting one or both of the main parachute risers to the reserve ripcord
Ripcord (skydiving)
A ripcord is a part of a skydiving harness-container system; a handle attached to a steel cable ending in a closing pin. The pin keeps the container closed and keeps the spring-loaded pilot chute inside. When the ripcord is pulled, the container is opened and the pilot chute is released, opening...

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The primary advantage of using an RSL is a faster reserve parachute deployment compared with using emergency handles alone; after a cut-away, the RSL will usually activate before the reserve deployment ripcord is pulled. However, proper emergency procedures require the reserve ripcord to be pulled in the event that the RSL is disconnected or not functioning correctly. An RSL also offers protection in the event a jumper cuts-away but does not (or can not) reach for the reserve deployment handle.

The RSL can be disengaged by a skydiver in situations where it is desirable to detach the main parachute without deploying the reserve. Examples of such situations may include certain high-wind landings (in case the parachute must be cut away if the skydiver is being dragged across the ground) or when performing canopy formations. The RSL attaches to the risers through a small metal loop that will disconnect when a fabric tab is pulled.
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