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PMag Preflight Check

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Speedy11(at)aol.com
Guest

Posted: Sun Aug 19, 2007 5:39 pm Post subject: PMag Preflight Check

Peter and Mike,

 You both said you do not recommend checking the PMag internal alternator  before each flight.  Will you please expand on your reasoning?

 Thanks,

 Stan Sutterfield

  

  	  Quote: 	
		  I think    I would do as you suggest and not check the P-mag internal alternator    every

flight either. 	


 

  



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aurbo(at)ak.net
Guest

Posted: Mon Aug 20, 2007 6:12 am Post subject: PMag Preflight Check

Stan,

  

 I looked back at what I wrote and I can't seem  to find where I would recommend that anyone  not check the onboard alternator function of the P-mag at the beginning of each  and every flight. 

  

 But (I think I) would not do so as (I) gained  confidence in those units. Just a personal thing Stan, I would likely still do  the mag drop check, old habits die hard.

  

 Mike

 [quote]   ---

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peter(at)sportingaero.com
Guest

Posted: Mon Aug 20, 2007 11:01 am Post subject: PMag Preflight Check

Hi Stan,

 

I don't think I recommended not to check the internal generator, just

that I don't do it. The generator is a back-up to a back-up, as the

ignition typically uses power from the alternator, then it could use

battery power, or it could use generator power, and the engine will

continue to run on the magneto alone in a pinch. There is certainly

nothing wrong with checking it every flight, I just don't do it. 

 

My choice is not to do a complete run up check on (usually) other than

the first flight of the day, I check for dead cut, check for normal

temperatures & pressures, carry out the normal before take-off checks

and go - probably my glider towing background showing through. I have

nearly 300 hours on the aeroplane and am familiar with the normal feel

and have seen/felt/heard several abnormal 'feels'. I don't get too

bunched over systems check when the systems have show themselves to be

reliable in my aeroplane, operated the way I operate it.

 

Yours, Peter

 

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ktlkrn(at)cox.net
Guest

Posted: Mon Aug 20, 2007 4:14 pm Post subject: PMag Preflight Check

I have two pmags, total time now 265 hours. This  includes one replacement and both sent in for updates during the annual. After  each reinstall I check to insure the mags were working at my idle setting. Both  were. 

  

 I didn't take the time to adjust the idle  abnormally low to find the cut off of each Pmag. (I did the first time) As long  as they work at my idle setting I was happy.

  

 I have my panel set up so everything to start works  from Left to Right and reverse for shut down.

  

 My process is as follows, Pmag switched breakers,  ON, Master On, full rich yada yada yada.

  

 On run up, RPM 1700, key switch on both. Check  left, back to Both, Check Right, back to Both. Done deal. If there is a problem  you'll know there.

  

 Why do anything different?

  

 During the one failure I had in flight (an internal  magnet failure of my left Pmag) I switched to the Right mag and proceeded on  safely. If you have a sudden rise in temps, rough running, loss of power, switch  mags to isolate and find out if it is a mag issue. 

  

 I firmly believe people are getting them in the set  up mode and messing up the timing. Set them up and leave them  alone!!!

  

 Darwin N. Barrie

 Chandler AZ

   [quote][b]

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Speedy11(at)aol.com
Guest

Posted: Mon Aug 20, 2007 11:45 pm Post subject: PMag Preflight Check

Peter and Mike,

 I must have misread your postings.  That's easy to do sometimes.

 I haven't had the pleasure of flying the same aircraft all the time - not  to mention one I built.  So, I can understand getting to know the airplane  very well and not needing a complete check on every takeoff.

 Stan Sutterfield

 Do not archive

  

  	  Quote: 	
		  I don't    think I recommended not to check the internal generator, just

that I don't    do it. The generator is a back-up to a back-up, as the

ignition typically    uses power from the alternator, then it could use

battery power, or it    could use generator power, and the engine will

continue to run on the    magneto alone in a pinch. There is certainly

nothing wrong with checking it    every flight, I just don't do it. 



My choice is not to do a complete    run up check on (usually) other than

the first flight of the day, I check    for dead cut, check for normal

temperatures & pressures, carry out the    normal before take-off checks

and go - probably my glider towing background    showing through. I have

nearly 300 hours on the aeroplane and am familiar    with the normal feel

and have seen/felt/heard several abnormal 'feels'. I    don't get too

bunched over systems check when the systems have show    themselves to be

reliable in my aeroplane, operated the way I operate    it.

	


 

  



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