FAA Powerplant Written Practice Test

What is a preferred connection method for aircraft wiring?

1. Using only solder for every connection

2. Permanent crimped splice connectors

3. Twist-on connectors

4. Alligator clips

The correct answer is: Permanent crimped splice connectors

The preferred connection method for aircraft wiring is the use of permanent crimped splice connectors. This method offers a reliable and durable connection that can withstand the various stresses encountered in an aviation environment, such as vibrations, temperature fluctuations, and exposure to moisture or other contaminants. Permanent crimped splice connectors create a strong mechanical connection between wires, ensuring a low-resistance electrical path while minimizing the potential for corrosion. Additionally, these connectors are less prone to failure over time compared to other connection methods, as they provide consistent and uniform pressure on the wires during installation, reducing the likelihood of looseness or damage. In contrast, relying solely on solder for every connection can introduce issues such as fatigue over time, as solder joints can become brittle and may crack or break when exposed to vibration and thermal cycling. Twist-on connectors, while simple to use, tend to be less reliable in the long term because they can loosen, which may lead to increased resistance or circuit failure. Alligator clips, although useful for temporary connections, are not considered suitable for permanent wiring in aircraft due to their potential for accidental disconnection and poor electrical contact. Thus, permanent crimped splice connectors stand out as the best choice for achieving safe and reliable electrical connections in aircraft wiring applications.