Term
| State the purpose of the power train system? |
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Definition
| The power train system provides a means of transmitting engine power to the main and tail rotor systems. |
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Term
| State the purpose of the freewheeling unit/sprag clutch assembly? |
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Definition
| The sprag clutch, in the freewheeling unit, provides a disconnect from the engine enabling autorotational forces to drive the transmission, tail rotor, and all transmission mounted accessories in the event of an engine failure. |
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Term
| What is the lubrication source for a freewheeling unit? |
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Definition
| The freewheeling unit is lubricated by transmission oil. |
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Term
| Does the freewheeling unit have a chip detection capability? |
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Definition
| Yes, but the chip detector is not electrically wired for a "Caution Light" indication in the cockpit. |
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Term
| What does the main drive shaft connect? |
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Definition
| It is a flexible coupling that connects the freewheeling unit to the transmission input drive. |
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Term
| Why is the main drive shaft a flexible coupling? |
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Definition
| The movement between the transmission (a floating pylon mount) and the freewheeling unit mounted on the engine (a rigid mount) requires a flexible coupling. |
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Term
| In the event of an engine failure, what drives the tail rotor in autorotation? |
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Definition
| The main drive shaft transfers transmission RPM (inflow of air through the rotor system) to the freewheeling unit to drive the tail rotor. |
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