The primary way to start the deployment sequence is by pulling the steel cable ripcord.
Once released, a spring-loaded pilot chute, similar to the main pilot chute (but usually slightly larger), launches into the relative wind and performs the same deployment operation as the main deployment sequence: the reserve pilot chute extracts the reserve deployment bag—a nylon bag holding the reserve parachute and staging the parachute deployment allowing the parachute lines to reach tensions prior to releasing the parachute allowing it to inflate.
Following the concept of static line jumping, where starting the main parachute deployment sequence relies on attaching a fixed cord to a large, stable object: namely the aircraft.
However, unlike a reserve-only deployment that relies on the reserve pilot chute for parachute extraction and deployment, the MARD system uses the jettisoned main canopy in place of the reserve pilot chute.
This means while the spring loaded pilot chute will launch and attempt to inflate, the jettisoned main canopy will overpower it due to its significantly larger size (and pull).
For each type of MARD developed, it requires some form of attachment between the main and reserve deployment systems.
In the 'engage' style MARDs, a small but simple choker loop is attached to the RSL lanyard and staged so that it can tighten around part of the reserve pilot chute system.
a faster reserve deployment (requiring less altitude) and keeping jettisoned components conglomerated allowing for easier retrieval.
Due to its prominence and early arrival to the market, the Skyhook has become the genericized trademark for MARDs.
There are other systems, such as the Skydive Wings Reserve Boost,[2] VSE Infinity MARD,[3] Mirage Trap System,[4] Rigging Innovations MOJO MARD,[5] Strong Enterprises Air Anchor, Peregrine Manufacturing Ace.