Commercial Pilot License (CPL) 2025 – 400 Free Practice Questions to Pass the Exam

When there is no positive gear down indication received, the first step should be to check the master switch. The master switch controls the electrical systems of the aircraft, including vital indicators and components such as the landing gear system. If the master switch is off, it would result in a loss of electrical power to the landing gear indicators, leading to an absence of the expected positive gear down indication.

By verifying that the master switch is set to "on," you ensure that power is supplied to all necessary systems, allowing for further checks of indicators and circuits. This foundational step is crucial because it addresses a common issue that could prevent other components from functioning correctly, thereby paving the way for a more effective troubleshooting process.

In contrast, checking other components like landing gear position indicators, gear pump circuit breakers, or the Press-To-Test feature would be premature without confirming that the master switch is operational. If there is an issue with the master switch, it negates the need to check other systems since they would all be inoperable without electrical power. Thus, starting with the master switch is a logical and essential first step in the troubleshooting protocol.