What should be monitored during an immediate airstart?

During an immediate airstart, it is crucial to monitor ITT (Interstage Turbine Temperature), N1 (the speed of the first-stage turbine), and oil pressure. These parameters are essential to ensure that the engine is starting properly and operating within safe limits.

Monitoring ITT is important because it provides insight into the temperature levels within the engine and can indicate if the engine is at risk of overheating or if there are issues that need addressing. N1 is a critical performance metric that indicates whether the engine is on the verge of a successful start; an appropriate N1 reading suggests that the engine is achieving the necessary speeds for normal operation. Oil pressure is a vital indicator of engine health: insufficient pressure can signal potential mechanical failure, which is especially concerning during the already-critical phase of an airstart.

While other items such as altitude and airspeed, control surfaces, and fuel levels are certainly important in general flight operations, they are secondary to ensuring the engine parameters are within safe operational limits during the airstart process. In the context of an immediate airstart, the focus must be squarely on the health and performance of the engine to ensure a successful restart.