While this method worked, today it is regarded as inadequate for maintaining the cooling needs of modern digital avionics for at least two reasons. Recognizing the need to cool older, radios, many aircraft were built with air scoops to funnel/direct outside ram air to promote cooling. OUTSIDE AIR SCOOPS? The relationship of heat and aircraft avionics life expectancy is show, the greater the operating temperature, the lower the equipment’s life expectancy and vice versa. In evaluating the temperature environment, consider the additional heat generated by the equipment, especially in a location where airflow is restricted.” In fact, cooling fans may be required equipment. Component temperatures are dependent on internal thermal design and external cooling. Not convinced? Consider the following statement from FAA Advisory Circular AC 23.1311-1C, “Installation of Electronic Display in Part 23 Airplanes”: “Electronic systems reliability is strongly related to the temperature of the solid-state components in the system. The bar graph at the top of the opposite page, adapted from the August 2017 issue of sister publication Kitplanes magazine, offers an estimate of life expectancy for modern avionics. While extreme cold temperatures can play havoc with avionics-for example, display screens may not work correctly-heat is the more pernicious threat. Combining the two sources-as when on the ground on a hot, sunny day, engine running and with all the electrical equipment active-is fairly common.
Unlike many other electronic devices, avionics also may be exposed to sunlight filtered only slightly by a transparency. The cockpit reference guides nots a warning message may mean "the PFD and/or MFD is overheating and is reducing power consumption by dimming the display."Īt bottom, a popular avionics cooling fan is pictured with the additional components necessary to provide a failure warning system.Įxcessive heat “kills” integrated electrical circuits, the kind found in modern avionics. In some conditions, this alert may be followed by a message that one or more components has poor cooling. MIL - AF,N,A - Military pilot, AF, N, A, etc.Garmin's G1000 cockpit reference guide lists the fan-related alerts the system may present, along with a description of which each one means.FI - Flight Instructor (non-FAA Country).SIM - Simulators only, or pre-student interest.
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