Cases for electrically operated instruments are typically made of what material?

Electricly operated instruments in aircraft are primarily housed in cases made of aluminum. This material is chosen for several reasons that are essential for aviation environments.

Aluminum is lightweight yet strong, which contributes to the overall efficiency of the aircraft by minimizing additional weight without compromising structural integrity. This characteristic is particularly vital in aviation, where weight savings can lead to improved performance, fuel efficiency, and capacity.

Further, aluminum possesses excellent resistance to corrosion, especially when coated or anodized, which is critical in aircraft applications exposed to varying atmospheric conditions and potential moisture. The durability of aluminum also allows it to maintain its mechanical properties and shape over a broad temperature range, which is crucial for instruments that need to function accurately under diverse operational conditions.

Additionally, the thermal and electrical conductivity of aluminum supports the proper functioning of electric instruments, enabling efficient heat dissipation and electrical connections necessary to maintain their accuracy and reliability.

Materials such as plastic may not provide the necessary durability and impact resistance needed for aircraft instruments under rigorous conditions, while iron or steel could introduce excessive weight or rust potential over time. Composite materials, while advanced and offering certain benefits, are not as commonly used for the housing of traditional electrically operated instruments. Thus, aluminum remains the preferred choice for these applications.