135.149—Equipment requirements: General.
No person may operate an aircraft unless it is equipped with—
(b)
Heating or deicing equipment for each carburetor or, for a pressure carburetor, an alternate air source;
(c)
For turbojet airplanes, in addition to two gyroscopic bank-and-pitch indicators (artificial horizons) for use at the pilot stations, a third indicator that is installed in accordance with the instrument requirements prescribed in § 121.305(j) of this chapter.