Which statement about engine start or RUN/STOP switch usage is true in the start sequence?

Which statement about engine start or RUN/STOP switch usage is true in the start sequence?

• A. The RUN/STOP switch is set to RUN to prepare for engine start
• B. The RUN/STOP switch is used to terminate engine after takeoff
• C. The RUN/STOP switch controls battery charging
• D. The RUN/STOP switch adjusts engine idle speed

Answer: (A)

During the start sequence, moving the RUN/STOP switch to RUN activates the engine start process. This position enables the ignition and fuel-control systems and engages the starter, allowing the engine to spool up from idle toward normal operation. While in RUN, you monitor key parameters such as RPM, ITT or EGT, and oil pressure to verify that the engine is starting correctly and to ensure it reaches a safe, stable idle. Once the engine is running smoothly and all indications are within limits, you continue with normal operation. The other options don’t fit this phase. The RUN/STOP switch isn’t used to terminate the engine after takeoff in the start sequence, and it isn’t responsible for battery charging or for adjusting idle speed directly—the latter is managed by the engine control system once the engine is running.

During the start sequence, moving the RUN/STOP switch to RUN activates the engine start process. This position enables the ignition and fuel-control systems and engages the starter, allowing the engine to spool up from idle toward normal operation. While in RUN, you monitor key parameters such as RPM, ITT or EGT, and oil pressure to verify that the engine is starting correctly and to ensure it reaches a safe, stable idle. Once the engine is running smoothly and all indications are within limits, you continue with normal operation.

The other options don’t fit this phase. The RUN/STOP switch isn’t used to terminate the engine after takeoff in the start sequence, and it isn’t responsible for battery charging or for adjusting idle speed directly—the latter is managed by the engine control system once the engine is running.