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## Chapter Summary 

This chapter focuses on main parachute packing techniques. The first rule is that the lines must be straight (no tangles, also known as “step throughs”). If the lines are straight and the slider is up (in square parachutes), the parachute will most likely open. The speed of the opening directly impacts the comfort or discomfort perceived by the jumper. Opening speed and orderliness is controlled by attenuation devices such as the slider, deployment bag, stow bands, or the diaper on a round parachute. Accoutrements, such as pilot chutes and bridles, must be checked frequently for wear that could affect their performance. 

Rubber bands should be changed when they begin to exhibit small holes or ragged edges. Minor maintenance now prevents hard openings and major failures later. Learn to be observant of small details about the parachute system even when packing the main. Virtually every pack job should be an inspection. It does not have to be as thorough an inspection as you would perform at the 180-day inspection and recertification, but the packer should be vigilant for damage or things that do not look quite right. 

Compatibility can be complex. When in doubt about which TSO a component was certified in, and whether it is compatible with another component in terms of opening force generated by the canopy versus strength of the harness, do not hesitate to call the manufacturer for guidance. 

One of the most critical things the rigger must observe when servicing their customers rigs is reserve bag extraction force. When a customer brings his or her container for inspection and repack, reserve bag extraction force should be tested with the container closed. A good rule of thumb is that the extraction force should be the same as the weight of the bagged canopy. If excessive forces are encountered, call the manufacturer. 

