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Thread: 912iS Switchology

  1. #1
    Senior Member Eric Page's Avatar
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    Default 912iS Switchology

    I'm working on laying out my instrument panel, and I've been reading through the 912iS installation and operator's manuals to figure out what switches and warning lamps are required for a basic installation with just the two internal alternators.

    Here's what I've come up with. Can someone with an installed 912iS tell me if I'm missing anything? Thanks!

    Switches:
    • Master [SPST]
    • Lane A [SPST]
    • Lane B [SPST]
    • Fuel Pump 1 [SPST]
    • Fuel Pump 2 [SPST]
    • Backup Battery [DPST, Locking Lever]
    • Start Power [DPST, Momentary]
    • Starter [SPST, Momentary]

    Warning Lamps:
    • Lane A
    • Lane B
    Eric Page
    Building: Kitfox 5 Safari | Rotax 912iS | Dynon HDX
    Member: EAA Lifetime, AOPA, ALPA
    ATP: AMEL | Comm: ASEL, Glider | ATCS: CTO
    Map of Landings

  2. #2

    Default Re: 912iS Switchology

    You might consider putting in an alt switch and an avionics switch. Otherwise you got it.
    Joe Gallagher
    Flying 7SS

    http://frontierfox.home.blog

  3. #3
    Senior Member Eric Page's Avatar
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    Default Re: 912iS Switchology

    I was under the impression that the Rotax "fuse box" managed the two internal alternators automatically. Is it possible to switch them on/off manually? If so, I presume the pilot only has control of the #2, 30-amp unit...
    Eric Page
    Building: Kitfox 5 Safari | Rotax 912iS | Dynon HDX
    Member: EAA Lifetime, AOPA, ALPA
    ATP: AMEL | Comm: ASEL, Glider | ATCS: CTO
    Map of Landings

  4. #4
    Senior Member efwd's Avatar
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    Default Re: 912iS Switchology

    Your original post lists precisely what I have on my 912is
    Eddie Forward
    Flying
    SS7, 912iS, Garmin G3X

  5. #5
    Senior Member Eric Page's Avatar
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    Default Re: 912iS Switchology

    Thank you, Eddie!
    Eric Page
    Building: Kitfox 5 Safari | Rotax 912iS | Dynon HDX
    Member: EAA Lifetime, AOPA, ALPA
    ATP: AMEL | Comm: ASEL, Glider | ATCS: CTO
    Map of Landings

  6. #6
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    Default Re: 912iS Switchology

    Quote Originally Posted by Eric Page View Post
    I was under the impression that the Rotax "fuse box" managed the two internal alternators automatically. Is it possible to switch them on/off manually? If so, I presume the pilot only has control of the #2, 30-amp unit...
    Correct.

    Sent from my SM-G973W using Tapatalk
    912 IS
    Airmaster Prop
    Garmin Stack
    C-FKLO

  7. #7
    Senior Member Eric Page's Avatar
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    Default Re: 912iS Switchology

    Which part is correct -- that the fuse box automatically controls both alternators, or that the pilot can control the #2 alternator manually?
    Eric Page
    Building: Kitfox 5 Safari | Rotax 912iS | Dynon HDX
    Member: EAA Lifetime, AOPA, ALPA
    ATP: AMEL | Comm: ASEL, Glider | ATCS: CTO
    Map of Landings

  8. #8
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    Default Re: 912iS Switchology

    Sorry. The EMS controls the switching of the alternators - you can not manually control them. I believe the switchover occurs at 2500rpms.
    912 IS
    Airmaster Prop
    Garmin Stack
    C-FKLO

  9. #9
    Senior Member Eric Page's Avatar
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    Default Re: 912iS Switchology

    Got it -- thanks!
    Eric Page
    Building: Kitfox 5 Safari | Rotax 912iS | Dynon HDX
    Member: EAA Lifetime, AOPA, ALPA
    ATP: AMEL | Comm: ASEL, Glider | ATCS: CTO
    Map of Landings

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