For how long can the engine TRQ reach a maximum during takeoff?

• A. 6 seconds
• B. 2 minutes
• C. 5 minutes
• D. 10 seconds

Answer: (C)

The correct duration for maximum engine torque during takeoff aligns with operational limits outlined in the TH-73A NATOPS manual. For the TH-73A, the engine torque can sustain a maximum level for a specified maximum time to ensure both performance during critical phases of flight and the safety and integrity of the engine. The limit set to 5 minutes allows pilots to utilize sufficient power during takeoff without compromising engine health, as running the engine at maximum performance beyond this duration can lead to overheating or potential engine damage.

Understanding this limit is crucial, as it provides pilots with guidelines to maintain performance while also safeguarding against adverse effects from prolonged maximum torque operation. The other options do not provide sufficient time to maintain performance during the takeoff phase while ensuring the engine does not overheat or sustain damage. Therefore, the established 5-minute limit reflects a balance between maximized performance and engine reliability.