Outline a typical normal engine start sequence for an ATR turboprop.

Outline a typical normal engine start sequence for an ATR turboprop.

• A. Start the first engine, and immediately power off
• B. Start the second engine first, then the first
• C. Power on all engines simultaneously
• D. Start the first engine, verify parameters (N1/N2, ITT, oil pressure), then start the second engine, confirm stable operation and synchronize

Answer: (D)

A typical ATR turboprop start is done sequentially with a careful check of each engine’s health before bringing the second into the mix. You begin by starting the first engine and watching the key indicators as it spools up. The important measurements are N1 and N2 speeds rising to their expected idle ranges, the ITT staying within safe limits, and oil pressure coming up to normal. When these parameters are within acceptable limits and the engine is clearly stable at idle, you proceed to start the second engine. The second engine is brought online and then both engines are monitored together to confirm stable operation for each one. Once both are running smoothly and all indications are in the green, you engage the synchronization system to keep the propellers at the same speed for a smooth, coordinated flight operation. Starting the second engine without first confirming the first is healthy can hide an abnormal condition and complicate a failure, and starting both engines simultaneously can place an excessive electrical and pneumatic load on the system.

A typical ATR turboprop start is done sequentially with a careful check of each engine’s health before bringing the second into the mix. You begin by starting the first engine and watching the key indicators as it spools up. The important measurements are N1 and N2 speeds rising to their expected idle ranges, the ITT staying within safe limits, and oil pressure coming up to normal. When these parameters are within acceptable limits and the engine is clearly stable at idle, you proceed to start the second engine. The second engine is brought online and then both engines are monitored together to confirm stable operation for each one. Once both are running smoothly and all indications are in the green, you engage the synchronization system to keep the propellers at the same speed for a smooth, coordinated flight operation. Starting the second engine without first confirming the first is healthy can hide an abnormal condition and complicate a failure, and starting both engines simultaneously can place an excessive electrical and pneumatic load on the system.