High_Flyer
Well Known Member
Hi everyone,
I've noticed an intermittent problem on one of my P-MAG>
My setup is: RV-7 with Aeropsort Power IO375, dual P-MAGS and VP-X Sport for the electrical system.
I've also installed two switches on my panel to test the self-power function of the P-MAG and I do the test before each flight.
My procedure:
- 1800 RPM
- both P-MAG power switches OFF (removes ship power to both P-MAGS), P-MAGS are now self powered on internal system.
- One P-MAG switch (P-Lead) OFF, observe RPM drop (typically 50-70 RPM for me), P-MAG switch (P-Lead) ON
- Repeat for other P-MAG
- Both P-MAG power switches ON.
Recently I noticed that my Left P-MAG is intermittently not producing ignition during this test. RPM drop OK with Power switch ON.
I also noticed that the RPM indication on my Dynon Skyview is jumping instantaneously to 2000RPM when this happens, although the engine is cutting off. Note that the RPM indication comes from the P-MAGS.
This problem is intermittent and happens with engine HOT.
Yesterday I did a flight, all good before takeoff. I did the test again after landing and the problem was there.
For troubleshooting I'm thinking to swap P-Mags (Left to right and right to left, if the problem switches side it must be a P-MAG problem, if not it must be an electrical problem but I can't think of what it could be...
Any help from specialists please...
Thank you,
Alain
I've noticed an intermittent problem on one of my P-MAG>
My setup is: RV-7 with Aeropsort Power IO375, dual P-MAGS and VP-X Sport for the electrical system.
I've also installed two switches on my panel to test the self-power function of the P-MAG and I do the test before each flight.
My procedure:
- 1800 RPM
- both P-MAG power switches OFF (removes ship power to both P-MAGS), P-MAGS are now self powered on internal system.
- One P-MAG switch (P-Lead) OFF, observe RPM drop (typically 50-70 RPM for me), P-MAG switch (P-Lead) ON
- Repeat for other P-MAG
- Both P-MAG power switches ON.
Recently I noticed that my Left P-MAG is intermittently not producing ignition during this test. RPM drop OK with Power switch ON.
I also noticed that the RPM indication on my Dynon Skyview is jumping instantaneously to 2000RPM when this happens, although the engine is cutting off. Note that the RPM indication comes from the P-MAGS.
This problem is intermittent and happens with engine HOT.
Yesterday I did a flight, all good before takeoff. I did the test again after landing and the problem was there.
For troubleshooting I'm thinking to swap P-Mags (Left to right and right to left, if the problem switches side it must be a P-MAG problem, if not it must be an electrical problem but I can't think of what it could be...
Any help from specialists please...
Thank you,
Alain