Pitot heat is required under U.S. 14 CFR Part 91, Appendix A for Category II operations, and Section 135.163(c) requires that each airspeed indicator be served by a heated pitot tube. CFR 91.205 itself does not demand pitot heat, yet when an airplane is operated under IFR, it must carry a heated pitot tube for each airspeed indicator. Even when not legally mandated, the prudent thing to do is to activate the pitot heat whenever flight conditions carry the potential for icing, because pitot tubes supply the primary total-pressure source for airspeed measurement. After landing, the pitot heat should be turned off, and whenever any pitot-tube heating element is inoperative the discrepancy must be treated as a system failure subject to the aircraft's approved documentation.
Is pitot heat required to fly?
Pitot heat must be activated when in flight and there is potential for icing, because pitot heat prevents ice from forming in the pitot tube. A pitot tube blocked with ice will provide erroneous airspeed readings, since the Airspeed Indicator (ASI) is part of the pitot-static system. Preflight checks, including removing covers, help prevent blockages caused by dirt, insects, or ice.
Small single engine single pilot airplanes are only required to have one airspeed indicator for aircraft certification and Part 135 operations. The indication system must incorporate an amber light that is in clear view of a flight crewmember, as Appendix-A-to-Part-91(2. )(b)(5) requires. SR-20/22 configuration has two airspeed indicators served by single heated pitot tube, and the Air Transportation Division determined SR-20/22 pitot-static system meets 135.163(c).
Is pitot heat required for ifr?
Part 125.205 and CFR 91.205(d) make one point unmistakable: an aircraft under IFR must have an airspeed indicating system with a heated pitot tube or an equivalent anti-icing means.
Without this protection, rain or icing contaminates the pitot opening and drives the airspeed indication to lie. That single failure cascades through the flight deck and ruins the pilot's only reference to safe speed while in the clouds. Because the rules treat the heated pitot tube as part of the required airspeed system, its presence is not optional once the pilot accepts an IFR clearance.
The same regulations do not demand a heated pitot for VFR flight. An airplane that carries a VFR only placard, or whose POH limits it to day or night VFR, is simply not equipped to the IFR standard. The absence of the heated element is one of the reasons the type certificate or the manufacturer withholds IFR approval. Therefore, the need for pitot heat is tied to the operation, not to the sky conditions at the moment of departure. If the flight is filed, cleared, or expected to be IFR, pitot heat is required. If the flight remains VFR and the aircraft is otherwise restricted to that regime, the heat is absent without violating the rule.
Can you fly without pitot heat?
Yes: the regulations do not list switched pitot heat as a day-VFR required item, so a mechanic can legally sign the airplane off and you can legally start the engine. The catch appears as soon as the airplane enters visible moisture with a temperature at or below freezing.One item that causes such a failure is pitot tube icing. On the ground, the airflow over the pitot tube is not sufficient to prevent this, and in the climb the blockage appears in seconds. A plugged pitot line leaves the mechanical airspeed indicator frozen on the last recorded speed while the static side continues to drop, making the indicator act like an altimeter and progressively over-read. Preflight checks, including removing covers, help prevent blockages caused by dirt, insects, or ice, but they cannot stop ice that forms after take-off.
The airplane suffers a complete loss of electrical power, yet the mechanical airspeed indicator is still functional. Nevertheless, if the pitot line is already blocked, that instrument is useless no matter how many pumps of the alternate static source you select.. Water contaminated by either a pitot or static system when flying in rain creates the same error, but only pitot heat keeps the entry point clear. Therefore, although the logbook allows you to go, the pragmatic rule is simple: no heat, no ice flying.
The topic of aviation without measuring instrument temperature is not an affair of preference. The pitot-static system is the aircraft's main reference of accuracy. Traveling without this essential machinery operational would present a needless and inevitable danger to air travel. An iced-over measuring device pipe makes the airspeed point uncertain.
Expert behind this article
Jim Goodrich
Jim Goodrich is a pilot, aviation expert and founder of Tsunami Air.
