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HeliTorque :: View topic - Governor On or Governor Off During Startup?
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HeliTorque Forum Index » Flight Dynamics

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Governor On or Governor Off During Startup?
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Do You Start An Robbo with the Governor:
Always On
47%
 47%  [ 11 ]
Always Off
34%
 34%  [ 8 ]
Depends on Machine
17%
 17%  [ 4 ]
Voted : 12
Total Votes : 23
This poll does not expire

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WhirlyGirl
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PostPosted: Sat Aug 06, 2005 6:38 pm    Post subject: Governor On or Governor Off During Startup? Reply with quote

I have noticed that the checklists of certain R22s I have flown tell you to have the governor on before turning the key, and some tell you to wait until you have done the mag checks. I have also noticed that some people I have flown with prefer it one way than the other.

Personally I always follow the checklist for the particular machine I am in. Was it changed for safety, to avoid overspeeds, or to stop it from kicking in before you're ready to go? Most of the machines I've flown say "Governor On" before starting, so I'm always aware that it's on and make sure I don't let it go above 80% before time.

What are your experiences of this, and do you have a preference on or off?

WhirlyGirl Cool
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Rich
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PostPosted: Sat Aug 06, 2005 10:12 pm    Post subject: Reply with quote

i would start gov off as that is what i was taught. Robo introduced the change about 9-10 months ago, and it is getting through to all the machines now.

R
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PostPosted: Sat Aug 06, 2005 10:16 pm    Post subject: Reply with quote

So it's nothing to do with the model of R22 then? I did wonder about that. Incidentally, has it changed from governor off to governor on in the last 9-10 months, or the other way round? The majority of the checklists I have seen lately say "on".

WhirlyGirl Cool
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Rich
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PostPosted: Sat Aug 06, 2005 10:20 pm    Post subject: Reply with quote

R22 yes (know nothing about R44's), and it went from Gov off to Gov on it was an AD and it should be on all checklists now as it was an AD.

R
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PostPosted: Sun Aug 07, 2005 7:12 am    Post subject: Reply with quote

I concur with Rich, it was changed last year from governor off to governor on. I think it also applies to the R44. You should note that the governor now isn't switched off during the cooldown, so it should always be left on. (Must say, through training before the directive, it's habitual to remove the governor at the end of a flight!)

I believe that it was introduced to help to prevent overspeeds, although I'm personally not convinced that it will - for a start, the governor is ineffective over 115%! The item on the checklist that prevents overspeeds would be "Thottle Closed". Wink

I always learnt the governor off method, so the change is something which is slightly odd to me! Cool

To a degree, it will depend on where you fly, if you use a checklist from Robinson, ignoring a slightly different checklist that has been provided by your 'school/SFH/heli-owner/etc.' and you have a problem, where do you stand? "Sorry, didn't use your checklist - used this one instead..." I'll generally use the one supplied with the machine, which for all the ones I've flown at Costock recently, show governor on at startup.
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PostPosted: Sun Aug 07, 2005 10:43 am    Post subject: Reply with quote

So it was changed to help prevent overspeeds? I was under the impression that most overspeeds happened when turning the key because they throttle had been left open. I wouldn't have thought the governor would kick in fast enough to protect against this even if it was switched on, if someone had made the mistake of leaving the throttle open at startup.

Correct me if I'm wrong, as I have never oversped a machine nor have I heard or seen one being oversped.

Regards,

WhirlyGirl Cool
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Bierbuikje
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PostPosted: Sun Aug 07, 2005 11:58 am    Post subject: Reply with quote

The check list did change just under a year ago so now the check list should always have the governor ON for start and shut down for both R22 & R44. If your check list says governor off then you have an outdated check list and need to get a new one.

As James said there is an upper limit to the governor (115%) If you start with the throttle fully open there is no guarantee that the RPM won???t go above 115% so the governor won???t always be able to contain the RPM. However if the RPM does not reach 115% the governor will restrict the RPM, this of course would not work if the governor was turned off.

The idea of having the governor on is not only for the engine start but it will also contain RPM if you roll on to much throttle when you increase RPM for engine warm up etc or at shut down if the RPM increase???s above 80% as long as you stay below 115%. I find it a much safer option to leave the governor on
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PostPosted: Sun Aug 07, 2005 2:55 pm    Post subject: Reply with quote

Thanks Bierbuikje, that makes sense. I have to admit most of the checklists I have used lately do say "Governor on".

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PostPosted: Fri Aug 12, 2005 12:31 pm    Post subject: Reply with quote

Be careful though...

I made a "faux pas" in the 44 a couple of years ago. Waiting for cool down with "Gov on - clutch out, I then realised that I needed fuel and asked the tower for a lift to the pumps. I opened the throttle slowly and the gov took over and wanged the needles to 110% Shocked causing an over-speed. One cheesed off puppy I can tell you!

Fortunately it wasn't too bad a cock-up. Gov OFF for me ever since Wink
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PostPosted: Fri Aug 12, 2005 10:39 pm    Post subject: Reply with quote

It seems that all the schools and hire plaes I fly from favour what Robinson dish out, and they are quite hot on this one.

So I favour what the hirers want you to do, which is governor ON.

After all, they are their machines, not ours. And I've been told off before for doing something I personally believed in, as opposed to what it says in the checklist.

But each to their own, I guess.
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PostPosted: Mon Oct 24, 2005 3:41 pm    Post subject: Reply with quote

it is not really being told off for something you believe in as doing something wrong.

if the aircraft manufacturer decides that the best thing for thier aircraft is in this case gov on then that is what it is, if you decide different good luck claiming on your insurance, and you are potentially putting your and any passengers lives at risk.

i always advise all my students to buy the POH (pilots operating handbook or flight manual) for all the machines they fly and to sign up for the ammendments service. they are expensive at ??45ish for a robbie (and think of a number for a squirrel.........) but that way you will always have up to date info from the people who know most about the aircraft - those who make it!
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PostPosted: Tue Oct 25, 2005 8:12 am    Post subject: Reply with quote

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PostPosted: Tue Oct 25, 2005 9:50 pm    Post subject: Reply with quote

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PostPosted: Fri Apr 11, 2008 7:44 pm    Post subject: Reply with quote

Just to let you know it is now definitely on for start (according to Fred Cross).

More details here.

Sarah
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