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  #1  
Old 08-12-2019, 07:31 AM
bkervaski's Avatar
bkervaski bkervaski is online now
 
Join Date: Mar 2017
Location: Birmingham, Alabama
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Default PMag Questions

I have two questions for PMag owners:

1) Do you check the generator at run-up every flight or is it just a periodic check? I'll have mine on breakers since it's a retro and I don't want to rework my panel.

2) What are you finding at the 100 hour inspections?

Thanks!
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  #2  
Old 08-12-2019, 07:34 AM
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Carl Froehlich Carl Froehlich is online now
 
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Location: Dogwood Airpark (VA42)
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Default

1. I do the internal generator check maybe twice a year. The pMags are on pull breakers. Don't be surprised if the internal generator works down to 750 RPM or so.
2. 100 hour checks - nothing ever found (1200 hours on the pMags)

Carl
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  #3  
Old 08-12-2019, 07:41 AM
dweyant dweyant is offline
 
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Location: 07TS
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I do the generator every run up. Never had an issue.

100 hour inspection, never found anything. Almost 500 hours.

-Dan
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  #4  
Old 08-12-2019, 07:59 AM
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DanH DanH is offline
 
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Default

Quote:
Originally Posted by bkervaski View Post
1) Do you check the generator at run-up every flight or is it just a periodic check? I'll have mine on breakers since it's a retro and I don't want to rework my panel.
Not much point in having a p-mag if you're not sure the internal generator works.

I have found a dead one during a pre-buy.
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  #5  
Old 08-12-2019, 08:03 AM
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N941WR N941WR is offline
 
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Location: SC
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I perform the generator check before every flight.

I had one fail at around 500 hours and the engine never skipped a beat. The only way I found it was in the preflight for the next flight.
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RV-9 (Yes, it's a dragon tail)
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  #6  
Old 08-12-2019, 08:13 AM
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MS19087 MS19087 is offline
 
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Location: West Chester, PA
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Default P-Mags on breakers vs VP?

Op brings up a good point. I ran P-Mags on my -9A for many years which had separate panel mounted breakers. In planning my new build I am inclined to retain that configuration vs putting them on the Vertical Power bus for quick access to pre-flight testing . . . any thoughts on this Bill R?
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  #7  
Old 08-12-2019, 08:19 AM
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N941WR N941WR is offline
 
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Location: SC
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Quote:
Originally Posted by MS19087 View Post
Op brings up a good point. I ran P-Mags on my -9A for many years which had separate panel mounted breakers. In planning my new build I am inclined to retain that configuration vs putting them on the Vertical Power bus for quick access to pre-flight testing . . . any thoughts on this Bill R?
Mark,

You can still run the P-mags through your VP bus and install a three way switch for testing. (I have pullable breakers plus the three way switch. Up is ungrounded and powered, middle is ungrounded and unpowered, and down is unpowered and grounded.)

Here is how I perform my pre-flight check before every flight. It takes longer to read than perform.



Here is an old picture of the panel, the switch placement has remained the same through three iterations and will remain the same as I plan the next panel upgrade.


(You can see I still hadn't cleaned up the wiring when this picture was taken.)
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RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
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www.repucci.com/bill/baf.html

Last edited by N941WR : 08-12-2019 at 08:23 AM.
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  #8  
Old 08-12-2019, 12:54 PM
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KeithB KeithB is offline
 
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Location: Granbury, TX
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I have spring toggle switches (push to open) on PMag power (as well as breakers) and check the internal generators independently at run up on every flight. I?ve never had an internal generator failure in 500 hours.
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  #9  
Old 08-12-2019, 01:19 PM
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mike newall mike newall is offline
 
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Location: Yorkshire, England
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We have dual P-Mags on our 7 - original fit since 2010.

I do a dead mag check every month, we do an inspection at annual when we change the plugs - whooo hoo, $7 a piece at O'Reillys

Only time we had an issue was when someone timed them like dumb mags. Holy carp, that backfire was spectacliar !

Fit 'Em, Fly 'Em, Enjoy 'Em.

Bring on the 6 version into production.

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  #10  
Old 08-12-2019, 01:24 PM
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GalinHdz GalinHdz is offline
 
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I do the generator check on every run up and have never had an issue. Dual P-Mags with individual circuit breakers and normally closed push to test buttons. I also do 100 hour inspections and have never found anything wrong. 450 hours and counting.


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Last edited by GalinHdz : 08-13-2019 at 06:16 AM.
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