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If there is smoke in the cockpit, my thinking is that it will be pretty much impossible to quickly identify the source. My Smoke in the Cockpit procedure is to open the battery master/alternator switch, which will kill the whole electrical system, except the Lightspeed EI and my turn and bank, both of which are fed from an always-hot battery bus. |
Because the P-Mag loses internal power below about 750 RPM I installed a DPDT switch with 2 slow blow fuses. Reason-----One day I turned off the P-Mag switch to check the internal power during the run up, got distracted and forgot to reenergize the circuit. Got to destination and on roll out with idle power engine quit! So now I have a light to indicate when the switch is OFF! Just another way of doing it. :-) Larry
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No power switches for any of our P-Mags Kevin - they are powered through pull-able breakers in order to test when needed. SInce I added them well after the -8 was flying, I also didn't have a good spot for the breakers on the norma panel - I put them on the inboard face of the left gear tower where I can reach them. It made adding the wires easy as well - buried them in the gear tower.
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One possibility would be to ditch the lightspeed and get 2 pmags, each with its own three-position switch. Your sense of (dis)order would not be offended.
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We have 2 P-Mags with a CB for each for Power.
Only use the CBs for the "once every so often" self-generating test. I would say not having this ability might not be ideal in a Dual P-Mag installation? But cannot see an issue in a single installation if you are willing to kill all ship's power. When you kill all power, do you still have RPM indications? The full test is to remove power from the P-Mag, having removed the other ignition system - then gently slow engine and note RPM at which self-generating stops. |
The 114's switch to internal power around 800 RPM, which works seamlessly. However, I had one of my 114's internal generators go bad and the only way I found it was to pull the power on them, one at a time, because it was running on ship's power.
So, yes, you want a way to kill the power on them. |
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