What is the minimum outside air temperature for starting the engine?

• A. -30 °C
• B. -20 °C
• C. -25 °C
• D. -15 °C

Answer: (C)

The minimum outside air temperature for starting the engine in the TH-73A is -25 °C. This specification is crucial because it ensures optimal engine performance and minimizes the risk of failure during the starting process in cold conditions.

Starting an engine in extremely low temperatures can lead to difficulties such as fuel thickening, increased viscosity of engine oils, and potential battery performance issues. Setting a minimum temperature helps ensure that the engine components can interact smoothly and prevents mechanical stress caused by cold starts. Each aircraft has specific limits based on the manufacturer’s testing and operational data, which consider not only engine functionality but also safety and reliability.

Understanding the environmental limitations of the aircraft is essential for safe operation, and adhering to the established minimum outside air temperature is vital for ensuring the longevity and functionality of the engine.