Oil tanks.

CFR · 2024-01-01 · US · Title 14

(a) (b) (1) Each oil tank used with a reciprocating engine has an expansion space of not less than the greater of 10 percent of the tank capacity or 0.5 gallon, and each oil tank used with a turbine engine has an expansion space of not less than 10 percent of the tank capacity; (2) Each reserve oil tank not directly connected to any engine has an expansion space of not less than two percent of the tank capacity; and (3) It is impossible to fill the expansion space inadvertently with the rotorcraft in the normal ground attitude. (c) (1) Each oil tank filler cap must provide an oil-tight seal under the pressure expected in operation; (2) For category A rotorcraft, each oil tank filler cap or filler cap cover must incorporate features that provide a warning when caps are not fully locked or seated on the filler connection; and (3) Each oil filler must be marked under § 29.1557(c)(2). (d) (1) Each oil tank must be vented from the top part of the expansion space to that venting is effective under all normal flight conditions. (2) Oil tank vents must be arranged so that condensed water vapor that might freeze and obstruct the line cannot accumulate at any point; (e) (f)

official document · source cfr-2024 · id 14:§ 29.1013