When the ignition switch is in the auto position, at what N1 percentage will the starter automatically disengage?

When the ignition switch is in the auto position, at what N1 percentage will the starter automatically disengage?

• A. 51%
• B. 43%
• C. 61+-1%
• D. 91%

Answer: (B)

In the context of the TH-73A helicopter's starting system, the automatic disengagement of the starter when the ignition switch is in the auto position is designed to ensure both safety and efficiency in engine operation. The correct N1 percentage at which the starter automatically disengages is 43%. This value is important because it reflects the engine's ability to sustain itself without the assistance of the starter, allowing for a smooth transition from starting to normal operation. By disengaging at this specific percentage, the system prevents the starter from running unnecessarily, which can lead to wear and potential damage. Thus, the 43% N1 threshold ensures that the engine is sufficiently operational while still protecting the components involved in the starting process, illustrating the deliberate engineering behind the TH-73A design for optimal performance.

In the context of the TH-73A helicopter's starting system, the automatic disengagement of the starter when the ignition switch is in the auto position is designed to ensure both safety and efficiency in engine operation. The correct N1 percentage at which the starter automatically disengages is 43%.

This value is important because it reflects the engine's ability to sustain itself without the assistance of the starter, allowing for a smooth transition from starting to normal operation. By disengaging at this specific percentage, the system prevents the starter from running unnecessarily, which can lead to wear and potential damage.

Thus, the 43% N1 threshold ensures that the engine is sufficiently operational while still protecting the components involved in the starting process, illustrating the deliberate engineering behind the TH-73A design for optimal performance.