nightsta1ker Posted June 30, 2012 Report Share Posted June 30, 2012 We have two S300s. On one of them the MP gauge responds very quickly, almost instantly to changes in collective, and the other is very slow, sometimes taking up to 10 seconds to stabilize. Both of these ships have been like this for as long as I have flown them, and since I did all of my recent training (last two years) in the R22, I don't remember how the S300s I trained in back in '03 behaved. Honestly, compared to the way a 22 MP gauge behaves, both of these gauges on the S300s we operate seem funky. They do the job, and I have no reason to think that they are inaccurate, they just stabilize at very different rates. Any insight? 1 Quote Link to comment Share on other sites More sharing options...
eagle5 Posted June 30, 2012 Report Share Posted June 30, 2012 Maybe they just need a little WD40! Quote Link to comment Share on other sites More sharing options...
Mikemv Posted June 30, 2012 Report Share Posted June 30, 2012 (edited) Have you discussed this with your maintenance provider or onsite A&P? Edited June 30, 2012 by Mikemv Quote Link to comment Share on other sites More sharing options...
Pohi Posted June 30, 2012 Report Share Posted June 30, 2012 No worries about the manifold pressure indication, just raise collective until you hear the rotor rpm droop and then you will know you are at max power. :-D 1 Quote Link to comment Share on other sites More sharing options...
nightsta1ker Posted June 30, 2012 Author Report Share Posted June 30, 2012 (edited) Mike, Yes to both. Everyone seems to think it is fine. But it has been bothering me for a long time. Edited June 30, 2012 by nightsta1ker Quote Link to comment Share on other sites More sharing options...
nightsta1ker Posted July 1, 2012 Author Report Share Posted July 1, 2012 No worries about the manifold pressure indication, just raise collective until you hear the rotor rpm droop and then you will know you are at max power. :-D That only works if you have a governor. I know I am running out of power when my wrist starts to hurt! Quote Link to comment Share on other sites More sharing options...
apiaguy Posted July 2, 2012 Report Share Posted July 2, 2012 Possibly an inline restriction from the #3 cylinder port to the gauge....Maybe carbon deposit around the intake port blocking the lineMaybe hose deterioration leasing to constriction of the line while operatingMaybe the gauge bellows has issues 1 Quote Link to comment Share on other sites More sharing options...
nightsta1ker Posted July 2, 2012 Author Report Share Posted July 2, 2012 Thanks that gives me several places to start looking. Quote Link to comment Share on other sites More sharing options...
zippiesdrainage Posted July 10, 2012 Report Share Posted July 10, 2012 Have you been feeding the Leprechaun under the cowling? Usually a delay in the MAP gauge is an early warning that they have been under fed lately (unicorn in the Schweizer). Quote Link to comment Share on other sites More sharing options...
nightsta1ker Posted July 11, 2012 Author Report Share Posted July 11, 2012 Have you been feeding the Leprechaun under the cowling? Usually a delay in the MAP gauge is an early warning that they have been under fed lately (unicorn in the Schweizer). Sure, I feed it. I feed it 15W 50 and 100LL. Quote Link to comment Share on other sites More sharing options...
Btshanigan Posted January 21, 2013 Report Share Posted January 21, 2013 I know this is an old post but anyway...from my experience it is usually because the plug is too tight. I figured this out because we had a mechanic tighten one because that was his response to a fluctuating needle, which was actually a governor problem. Quote Link to comment Share on other sites More sharing options...
nightsta1ker Posted January 26, 2013 Author Report Share Posted January 26, 2013 I know this is an old post but anyway...from my experience it is usually because the plug is too tight. I figured this out because we had a mechanic tighten one because that was his response to a fluctuating needle, which was actually a governor problem. Thanks for the comment. It turned out to be a problem with the gauge itself, which was fixed by a repair facility. In any case, we no longer have that aircraft. Quote Link to comment Share on other sites More sharing options...
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