What can cause an engine failure in the TH-73A?

• A. Excessive chips in the engine and engine fire
• B. High oil pressure and poor fuel quality
• C. Normal fuel flow and engine temperature
• D. Overactive fuel pumps and external FOD

Answer: (A)

Excessive chips in the engine and engine fire are significant indicators of potential engine failure in the TH-73A. The presence of excessive chips may suggest severe wear or damage within the engine components, which can lead to mechanical failure if not addressed. Additionally, an engine fire poses a critical risk and can quickly lead to complete engine failure. The combination of these factors highlights serious engine integrity issues that could compromise the aircraft's safety and operational capability.

In contrast, high oil pressure typically suggests that the engine is functioning correctly, as it indicates proper lubrication, and while poor fuel quality can affect performance, it is less immediate in terms of causing engine failure compared to the severe risks associated with chips and fire. Normal fuel flow and engine temperature indicate the engine is performing as expected, and overactive fuel pumps and external Foreign Object Damage (FOD) could lead to performance issues, but they are not direct and immediate causes of complete engine failure.