Which item is typically included in the ATR pre-start checklist?

• A. Doors/door area secure
• B. External power or APU availability
• C. Flight deck instrument checks
• D. Takeoff data set

Answer: (B)

Having a power source available is essential before starting engines. On an ATR, the pre-start checklist includes confirming that external power or the APU is available to supply electrical power to all systems and to provide bleed air for starting. This ensures the flight deck instruments, avionics, and starting systems can operate without relying on an airborne power source, making engine start safe and reliable. Without a power source, you can’t perform necessary checks or start the engines correctly, so confirming power availability is the most critical item in the pre-start sequence.

Other preflight items may be checked as part of general ground operations or after power is established—for example, doors being secure, instruments being powered and checked, and takeoff data being set—but they depend on having a valid power source first.