After confirming that the accessory breakers are OFF, which breaker should be ON?

After confirming that the accessory breakers are OFF, which breaker should be ON?

• A. Fuel pump circuit breaker
• B. Engine run
• C. Control
• D. Governor

Answer: (A)

The essential idea is to power the fuel system to get fuel pressure for starting. After confirming the accessory breakers are OFF, the fuel pump circuit breaker should be ON because the electric fuel pump needs to run to prime and supply fuel to the engine during start and operation. Without fuel pressure, the engine can’t start or sustain idle, even if ignition or other controls are energized later. The other breakers control non-fuel-system parts of the engine and aircraft; they aren’t required to start and won’t provide the necessary fuel flow on their own.

The essential idea is to power the fuel system to get fuel pressure for starting. After confirming the accessory breakers are OFF, the fuel pump circuit breaker should be ON because the electric fuel pump needs to run to prime and supply fuel to the engine during start and operation. Without fuel pressure, the engine can’t start or sustain idle, even if ignition or other controls are energized later. The other breakers control non-fuel-system parts of the engine and aircraft; they aren’t required to start and won’t provide the necessary fuel flow on their own.