FAA Powerplant Written Practice Test

How is the proper operation of an electric deicing system and its timers typically monitored onboard?

1. Voltmeter

2. Amp meter

3. Pressure gauge

4. Temperature gauge

The correct answer is: Amp meter

The proper operation of an electric deicing system and its timers is most effectively monitored using an amp meter. This device measures the electrical current flowing through the deicing system, allowing for real-time assessment of its performance. If the current is lower than expected, it may indicate that the heating elements are not functioning properly, while a significantly high reading could suggest a short circuit or other electrical issues. By monitoring the amperage, maintenance personnel can ensure that the system is operating within the designed parameters and can detect potential faults before they lead to system failure. In contrast, while a voltmeter measures voltage, it does not provide sufficient information about the current draw of the system, which is crucial for assessing its operational status. Pressure gauges and temperature gauges do not directly relate to the electric deicing system's performance; pressure gauges would be more relevant to hydraulic or pneumatic systems, and temperature gauges would monitor temperatures but not specifically for monitoring current or electrical operation status. Thus, using an amp meter is the most suitable method for ensuring the effective operation of electric deicing systems and their timers.