Operations Chapter 4 Introduction  Certificated parachute riggers represent a professional cadre  within the parachute community. According to Title 14 of  the Code of Federal Regulations (14 CFR) part 65, section  65.129(f)(1), “No certificated parachute rigger may exercise  the privileges of his certificate and type rating unless he  understands the current manufacturer’s instructions for  the operation involved and has performed duties under his  certificate for at least 90 days within the preceding 12 months.” Manufacturers of main parachutes have packing techniques  that they have developed for their products. Most of them  follow established methods in common use. Experience  has shown that if the packing techniques required for a  specific main are too complex, the market may not receive  them favorably. Throughout the chapter, each component of the parachute is  discussed along with its function and how it applies to the  entire assembly. One component can have a significant effect  on the performance of another. For example, a pilot chute that  is too large may result in too fast of an opening; and a pilot  chute that is too small may not be able to overcome a bag lock. 