Which of the following should be performed first during a PDC?

In the context of a Pre-Drive Check (PDC) for an ambulance, ensuring that the handbrake is applied and the gear lever is in the correct position is critical before any other actions are taken. This step is essential for ensuring the vehicle's safety prior to starting the engine or engaging in any driving activity.

If the handbrake is not engaged, the vehicle could roll away when the engine is started, creating a dangerous situation. Additionally, checking that the gear lever is in the correct position (typically neutral for automatic vehicles or first gear for manual ones) is vital to prevent unexpected movements when the vehicle is started. Performing these checks first establishes a safe foundation for the subsequent steps in the pre-drive check process. This prioritization aligns with best practices in vehicle safety and operation.

Adjusting mirrors, performing the starting procedure, and conducting a static brake test are also important, but they follow the crucial safety checks of ensuring the vehicle is secure with the handbrake applied and gear lever checked.