No certificated parachute rigger may--
(a) Pack, maintain, or alter any parachute unless he is rated for that type;
(b) Pack a parachute that is not safe for emergency use;
(c) Pack a parachute that has not been thoroughly dried and aired;
(d) Alter a parachute in a manner that is not specifically authorized by the Administrator or the manufacturer;
(e) Pack, maintain, or alter a parachute in any manner that deviates from procedures approved by the Administrator or the manufacturer of the parachute; or
(f) Exercise the privileges of his certificate and type rating unless he understands the current manufacturer's instructions for the operation involved and has--
(1) Performed duties under his certificate for at least 90 days within the preceding 12 months; or
(2) Shown the Administrator that he is able to perform those duties.