What is the maximum IOAT for start?

The correct choice indicates that the maximum Inlet Outside Air Temperature (IOAT) for engine start in the T-6A aircraft is 80 degrees Celsius. Understanding the significance of this limit is crucial for ensuring the safe operation of the aircraft during the start procedure.

Starting an aircraft engine under optimal temperature conditions is essential for preventing potential damage to the engine and related components. Higher IOAT values can lead to a decrease in engine performance, which may result in difficulties in starting the engine or possible operational issues shortly after start. Exceeding the maximum IOAT of 80 degrees Celsius could lead to challenges in achieving proper fuel-air mixture and ignition conditions during start, thereby compromising engine function and safety.

The establishment of a maximum temperature ensures that pilots are aware of the ambient conditions that could affect engine performance, thereby promoting a protocol that enhances the reliability and longevity of the aircraft's systems. Consequently, adhering to this limit helps maintain operational integrity and safety.