36 C.F.R. § 261.18
National Forest Wilderness
The following are prohibited in a National Forest Wilderness:
(a) Possessing or using a motor vehicle, motorboat or motorized equipment except as authorized by Federal Law or regulation.
(b) Possessing or using a hang glider or bicycle.
(c) Landing of aircraft, or dropping or picking up of any material, supplies, or person by means of aircraft, including a helicopter.