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-   -   PMag Questions (https://vansairforce.net/community/showthread.php?t=174198)

bkervaski 08-12-2019 07:31 AM

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!

Carl Froehlich 08-12-2019 07:34 AM

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

dweyant 08-12-2019 07:41 AM

I do the generator every run up. Never had an issue.

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

-Dan

DanH 08-12-2019 07:59 AM

Quote:

Originally Posted by bkervaski (Post 1365974)
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.

N941WR 08-12-2019 08:03 AM

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.

MS19087 08-12-2019 08:13 AM

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?

N941WR 08-12-2019 08:19 AM

Quote:

Originally Posted by MS19087 (Post 1365988)
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.)

KeithB 08-12-2019 12:54 PM

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.

mike newall 08-12-2019 01:19 PM

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.

:D

GalinHdz 08-12-2019 01:24 PM

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.


:cool:


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