§3.608 Carburetor fluid de-icing system capacity.

The fiuid de-icing system capacity shall not be less than that required to provide fluid at the rate specifled in §3.607 for a time equal to 3 Percent of the maximum endurance of the airplane. However, the capacity need not in any case exceed that required far 2 hours of operation nor shall it be less than that required for 20 minutes of operation at the above flow rate. If the available preheat exceeds 50° F. but is less than 100° F., it shall be permissible to decrease the capacity of the system in proportion to the heat rise available in excess of 50° F.