Advisory Circulars from 1985

This advisory circular (AC) sets forth a specific method of compliance with the requirements of 5 25.1455 of the Federal Aviation Regulations (FAR) pertaining to draining of fluids through drain masts when the fluids are subject to freezing. This method is designed to verify that draining fluids will not accumulate as ice in sufficient quantity to be hazardous. This AC is for guidance purposes and to set forth one method of compliance that has been found acceptable. As with all advisory circular material, it is not mandatory and does not constitute a regulation. In lieu of following this method, the applicant may elect to follow any alternate method found by the FAA to be an acceptable means of complying with the requirements of 5 25.1455