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11-29-2014, 02:21 PM
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Join Date: Apr 2008
Location: California
Posts: 652
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Quote:
Originally Posted by jrs14855
Regarding mag grounding, I have not seen mention that if you have one impulse and one non impulse mag, the non impulse MUST be off for start. This happens automatically with properly wired key switch. With toggles if you forget this you may very well trash your starter.
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I used DPDT switches. Power cannot be applied to the starter unless 1) The Master is ON, 2) The left mag is ON, 3) The right mag is OFF 4) The button is pushed on the stick. Additionally, with the left mag in the middle position and the right mag off, both are still grounded but you can engage the starter (for the rare occasions you may wish to do this).
This thread is as amusing as the old "ALL IN THE FAMILY" episode where Meathead and Archie are arguing about the proper procedure for putting on socks and shoes. One advocated a sock and a shoe, a sock and a shoe, and the other advocated sock, sock, shoe, shoe... all based on various scenarios with a house fire thrown in and how prepared you would be under various circumstances.
The bottom line is there are several ways to accomplish the appropriate level of functionality and safety. Do what you like, just don't do anything stupid.
Don
__________________
RV-8 QB Titan ECi 191HP XIO-360
WW200RV Dynon D180 HS34 AP74
GNS430 SL30 GTX327 PS8000B Uavionix Echouat
"Pilots are alchemists... we turn gold into lead."
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11-29-2014, 02:26 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by jrs14855
General opinion from other sources agrees with what I have always believed: rotating beacon, if installed, on for engine start. Strobe lights on when cleared for takeoff, off when clearing runway after landing.
If you operate stobe lights, especially at night, for start and taxi, be prepared for a LOT of flak from those who know better.
Regarding mag grounding, I have not seen mention that if you have one impulse and one non impulse mag, the non impulse MUST be off for start. This happens automatically with properly wired key switch. With toggles if you forget this you may very well trash your starter.
Mag wire shielding has been discussed many times on this forum. Only the mag end of shielding should be grounded, the switch end should be open.
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It was already covered here...
http://www.vansairforce.com/communit...3&postcount=15
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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11-29-2014, 05:37 PM
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Join Date: Jun 2007
Location: new iberia la
Posts: 768
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Toggle Switches & Strobe Lights
As others state there are lots of ways to switch the mags on or off. I'm going with individual toggles for the impulse mag and EI and a guarded toggle to enable/disable a panel mounted push button starter switch. If I feel the need for more protection I might add a hidden switch in the power feed to starter solenoid.
I respectfully have to disagree with turning the strobes on for startup or any other time before taking the runway. The aircraft checklists that call for anti-collision lights on before start are likely referring to the red rotating/flashing beacon when aircraft still had those, not the strobe lights.
Don Broussard
RV 9 Rebuild in Progress
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11-29-2014, 07:27 PM
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Join Date: Jan 2006
Location: New Smyrna Beach, FL
Posts: 1,339
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Quote:
Originally Posted by jrs14855
General opinion from other sources agrees with what I have always believed: rotating beacon, if installed, on for engine start. Strobe lights on when cleared for takeoff, off when clearing runway after landing.
If you operate stobe lights, especially at night, for start and taxi, be prepared for a LOT of flak from those who know better.
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I think this is what the AIM recommends, as well, but I am too tired to look it up at this particular moment. If I am wrong about that, I am sure I will be notified. 
__________________
David Maib
RV-10 N380DM
New Smyrna Beach, FL
VAF Paid 1/21/2020
"In '69 I was 21, and I called the road my own"
Jackson Browne
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11-29-2014, 08:24 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
Originally Posted by az_gila
I think a modern kid would just as likely turn a key switch as press a button... 
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Not really possible since the key is in MY pocket, not in the switch, when I'm not in the cockpit (and yes, it's on my shutdown checklist..."Keyswitch OFF and Key OUT").
Just to throw another combination into the mix...I have toggle switches for L Mag, R Mag, and Battery Master, a keyswitch interlock which must be ON in order for the pushbutton START switch to operate.
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11-29-2014, 08:46 PM
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Join Date: Jan 2005
Location: Fort Worth area
Posts: 97
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Last Checklist
before crossing the runway hold line I use an old familiar 3-letter abbreviation:
STP
Strobes, Transponder, Pump
Been working for me for more years than I'd care to admit.
__________________
RV-8 N88GK Sold
RV-9A Slider, N188GK Project, now flying, O-320-B1A, Catto 3 Blade NLE, G3X Touch System
Restored Taylorcraft BC12-65
Exempt but proud contributor
Jerry Kinman, VAF 170
Keller, TX (T67)
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11-29-2014, 09:14 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Re: strobes vs beacons (the red, "rotating" kind)...
Both are "anti-collision" lights. You need at least one kind, and if you only have one, it needs to be on when during all operations unless it would affect safety. If you have both, one of the two should be on.
I think many of us have *only* strobes, no red flashing/rotating beacon, so turn them on prior to engine start.
Good point about night ops, though...might be safer to use the nav lights and taxi/landing lights only while on the ramp. Something to think about...
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11-29-2014, 09:37 PM
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Join Date: Jul 2008
Location: NorCal
Posts: 565
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Since this thread has drifted to starting procedures and safety, I'll add my gripe: pilots that yell "Clear!" then turn the prop a fraction of a second later. Geez, wait a few seconds for people to notice.
As for lights on before starting, that helps at night but during the day not so much. Be careful, pilots and pedestrians.
__________________
Ralph Finch
RV-9A QB-SA
Davis, CA
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11-29-2014, 10:01 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by RV7A Flyer
Re: strobes vs beacons (the red, "rotating" kind)...
Both are "anti-collision" lights. You need at least one kind, and if you only have one, it needs to be on when during all operations unless it would affect safety. If you have both, one of the two should be on.
I think many of us have *only* strobes, no red flashing/rotating beacon, so turn them on prior to engine start.
Good point about night ops, though...might be safer to use the nav lights and taxi/landing lights only while on the ramp. Something to think about...
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FAR 91.209(b) is the reference.
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11-29-2014, 10:57 PM
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Join Date: May 2010
Location: Benaraby Queensland. Australia
Posts: 209
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I have wired up my plane as Don above describes it. I have a keyed master switch, down between my knees, close to the battery, plus another switch on the panel, clearly labelled. Nobody can energise anything if I remove the key from the master switch. Starting with the right mag on cannot be done, but as soon as the engine fires I flick the right mag on, that stops the starter and gives me a running engine. The downside of this is that if I need to use the starter in flight, I must turn the right mag off. If there is a failure of the left mag and the engine stops in flight, starting with the right mag on will not happen. In that case my only chance of a restart is to operate the starter and flick right mag on. When doing the wiring design I agonised over this and eventually came to the conclusion that the probability of losing the engine was too low to worry about.
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