FAA Powerplant Written Practice Test

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Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

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What must be done to a solenoid-operated fuel valve before removing a fuel hose from an engine?

Disconnect the fuel line
Close the solenoid fuel valves with battery power
Leave the battery connected
Open the fuel valves

The correct answer is: Close the solenoid fuel valves with battery power

Before removing a fuel hose from an engine, closing the solenoid fuel valves with battery power is essential for safety and to prevent fuel from leaking. The solenoid-operated fuel valves are designed to control the flow of fuel, and when they are energized (with battery power), they close off the fuel flow. This action minimizes the risk of fuel spillage during the disconnection process, which could create hazardous situations such as fire or contamination. Ensuring the valves are closed before disconnecting the fuel hose means that there is a controlled environment and reduces the potential for fuel hazards during maintenance. This step is crucial in adhering to safety protocols, which are fundamental in aviation maintenance practices.