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UH-1H Huey Autorotation and Instrument Readings


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During practice autorotation in Huey, while doing according to checklist, Throtle is rolled to idle position. So we expect to Idle RPM on N1 gauge, and that is 68% to 72 %, so correspondingly, where should be N2 (Power turbine) on N2/NR instrument gauge.

 

It should not be at 6600 RPM, rather less then it. But then where it should be...? 6000 or 5800 or what.

As soon as the throtle is again full open, N2 should goes back to 6600, and join with Rotor Needle.

 

 

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It should not be at 6600 RPM, rather less then it. But then where it should be...? 6000 or 5800 or what.

As soon as the throtle is again full open, N2 should goes back to 6600, and join with Rotor Needle.

 

What's the problem? Are you getting a needle split?

 

With N1 @ 72% an, unloaded N2 (rotor in autorotation) could run 6000 - 6100 RPM. What you should be concerned with is your rotor RPM in autorotation, within correct range, per maintenance manual.

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What's the problem? Are you getting a needle split?

 

With N1 @ 72% an, unloaded N2 (rotor in autorotation) could run 6000 - 6100 RPM. What you should be concerned with is your rotor RPM in autorotation, within correct range, per maintenance manual.

Yes, my confusion is over now. During practice autorotations, we must be looking for Rotor needle, NR, where it is. No concern that where is N2 needle. Split of N2/ NR is manifest that, Clutch is working properly.

Regards

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Interesting question! Glad you got it sorted out. It's surprising how that machine auto's....you would think it would auto great; but it really falls like a brick! The 206 (which I think pretty poorly of) auto's great and the 205 / Huey (that I really like) auto's poorly.

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