What type of air is required for activating a pneumatic starter on a turbine engine?

The activation of a pneumatic starter on a turbine engine requires low pressure and high velocity air. This is because the starter needs a rapid airflow to efficiently initiate rotation of the turbine engine's compressor section. The high velocity of the air assists in overcoming inertia and ensuring that the engine begins to spool up quickly to reach a self-sustaining speed.

Using high velocity air allows for the effective transfer of kinetic energy to the turbine shaft, facilitating the startup process. While low pressure is sufficient for starting, the focus is on the velocity of the moving air to deliver the necessary force for engine ignition and operation. This understanding of the pneumatic starter's requirements is essential for anyone involved in turbine engine maintenance and operation.