14 CFR 23.1097 - Carburetor deicing fluid system capacity.
(a) The capacity of each carburetor deicing fluid system -
(1) May not be less than the greater of -
(ii) 20 minutes at that flow rate; and
(2) Need not exceed that required for two hours of operation.
(b) If the available preheat exceeds 50 °F. but is less than 100 °F., the capacity of the system may be decreased in proportion to the heat rise available in excess of 50 °F.