An approved chair-type parachute may be carried in an aircraft for emergency use if it has been packed by an appropriately rated parachute rigger within the preceding

Explanation

14 CFR 91.307(a)(1) allows an approved emergency parachute to be carried if a certificated, appropriately rated rigger packed it within the preceding 180 days, for parachutes made of nylon, rayon or similar synthetic materials (natural-fiber parachutes, now rare, require repacking every 60 days). 120 days was the old interval and 365 days is not in the rule.