7 Pa. Code § 203.91
(a) A protective helmet meeting the 1984 Standard for Protective Headgear (Snell Memorial Foundation), Laboratory Procedure for Motorcycle Helmut Testing (Federal Motor Vehicle Safety Standard No. 218, United States Department of Transportation) or Specification for Headgear Used in Horse Sports and Horse Back Riding (ASTM Standard F085.53, Draft # 4, 1986) standards for protective harness racing headwear, securely fastened under the chin, must be worn at all times on association grounds when:
(d) Failure of persons to adhere to the previous safety helmet provisions may subject the person to the following penalties: