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Leo Holler
Joined: 29 Mar 2007
Posts: 7
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 Posted: Fri Apr 11, 2008 11:06 pm Post subject: Alternate Feed Switch, is it a Master Switch?? |
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Help! Am working on a new electrical system design (pretty much a standard Z-11) for a complete re-wire of a certified ship. A friend tells me that a certified aircraft can only have one Master Switch per FAA regs. Is the "Alternate Feed" switch for the Endurance Bus considered a Master Switch? If so, how does it reconcile with any regs? Or, is my friend wrong? I have read Sec. 23.1361, regarding Master Switch arrangement, and I'm not totally comfortable in my interpretation of what is being said. The section seems to infer that more than one switch can be incorporated into a Master Switch arrangement, but with some restrictions. Can someone shed some light on me regarding this matter?
I have been planning to locate the Alternate Feed switch immediately adjacent to the main Master Switch and under a switch guard. Presumably, both switches would only be on simultaneously for the short time after energizing the Endurance Bus via the Alternate Feed and turning the main Master off after an alternator or battery contactor failure.
Per 23.1361, am I restricted to no more than a 5 amp total load on the Endurance Bus (that should be plenty)? Would I also be restricted to no more than a 5 amp protective device for the bus feed? My bus feed wire will be about 8" long.
Thanks to any of you "Masters" for any enlightenment you can share.
The FAR quoted above can be found at:
http://www.risingup.com/fars/info/part23-1361-FAR.shtml
Leo
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schaefer(at)rts-services.
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| Posted: Sat Apr 12, 2008 4:44 pm Post subject: Alternate Feed Switch, is it a Master Switch?? |
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Before Cessna bought Columbia you could get the Columbia 400 wiring diagrams
from their web site. (have not checked lately). They have dual bus, dual
alternator with an essential bus diode fed from either bus.
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