Sec. 4-5.304.   Aircraft engine operation.
   (a)   Minimum distance from buildings. Aircraft shall be stopped and all engines shut off at a minimum distance of twenty-five (25’) feet before entering any hangar or building.
   (b)   Operations within buildings. No aircraft engine shall be started or run up in any hangar, or when the aircraft is tailed toward hangar doors, or when positioned in such a manner as to constitute a danger to persons or property. Taxiing in and out of hangars shall be specifically prohibited.
   (c)   Engine tests. Engine run-ups and tests shall be performed in areas designated by the fixed base operator and approved by the Board by rule. (§ 1, Ord. 773, eff. April 14, 1977)