CS 22.975  Fuel tank vents

CAA ORS9 Decision No. 1

Each fuel tank must be vented as close as practicable to the highest point of the tank installation, or from the top part of the expansion space where this is required to be provided. In addition: 

(a) Each vent outlet must be located and constructed in a manner that minimizes the possibility of its being obstructed by ice or other foreign matter. 

(b) Each vent must be constructed to prevent siphoning of fuel during normal operation. 

(c) Each vent must discharge clear of the powered sailplane.