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Thread: Starting using the Aux Power lug

  1. #1

    Starting using the Aux Power lug

    We have just installed the Beech Aux Power Outlet on my 1980
    Sundowner. This is a 28vdc system so it uses the Aux Power Relay.
    The wiring diagram showes the Aux Power lead connects to the LOAD
    side of the Battery Relay. When 24vdc is applied to the Aux Outlet
    the /aux relay closes and connects the Aux Power to the LOAD. The
    Operator Manual says to turn the MASTER ON when using the Aux
    Power. If you do this then the Aux Power and the Battery will be in
    Parallal with the LOAD. When you disconnect the Aux Power the
    Battery could keep the Aux Power Relay energized. The operating
    Manual says nothing about turning the Master Off to break the Seal
    in.

    What is the correct procedure? I am thinking that when you have the
    Aux Power Relay you should start with the Master OFF( thats what I
    did in my Cessna 310). The Aux Power relay will energize all that
    the Battery Relay did. Once started and the Aux Power is removed the
    Aux Power relay will drop out and you then turn the Master and Alt
    on.

    If you start as the Operater manual says i think that you would have
    to turn the Master OFF after starting to drop the Aux Power Relay
    out then turn the Master and Alt ON.

    I would like to hear comments from people that have used the 24 vdc
    Aux Power system

    Mike Dawson




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  2. #2
    mike at rellihan.com
    Guest

    Starting using the Aux Power lug

    Mike, I have no experience with this system, but what you say makes perfect
    sense to me. With the Aux Power relay back-feeding through itself once
    energized, either from the battery or alternator or both, there would be no
    way to use a diode or something similar, to remove the Aux Relay On power
    circuit feed. Seems like it really should have been on a separate switch,
    since this system doesn't have the 'third small pin' to activate the relay.
    I have to assume that, once energized, Beech simply intended for the
    external power port to stay 'live' until the flight was completed and the
    engine shut down.

    Normally, I would never just jump-start a battery and then go fly. I can
    envision situations, like an oncoming flood, when I might do it (!) It is
    pretty hard on the alternator and regulator. It is much better to use the
    external power to recharge a low battery for a half-hour or more. Then shut
    things off to disconnect the aux relay, confirm battery condition by
    cranking the engine normally, then go fly. If the battery can crank the
    plane normally on its own, it will just be drawing a normal recharge from
    the charging system, without a prolonged high recharge load. It may still
    have a prolonged load that is a bit higher than normal, by five or even ten
    amps, but it won't be pulling forty or fifty amps.

    -----Original Message-----
    From: bac-mail-bounces@beechaeroclub.org
    [mailto:bac-mail-bounces@beechaeroclub.org] On Behalf Of michael dawson
    Sent: Tuesday, February 14, 2006 8:06 PM
    To: bac-mail@beechaeroclub.org
    Subject: [BAC-Mail] Starting using the Aux Power lug

    We have just installed the Beech Aux Power Outlet on my 1980
    Sundowner. This is a 28vdc system so it uses the Aux Power Relay.
    The wiring diagram showes the Aux Power lead connects to the LOAD
    side of the Battery Relay. When 24vdc is applied to the Aux Outlet
    the /aux relay closes and connects the Aux Power to the LOAD. The
    Operator Manual says to turn the MASTER ON when using the Aux
    Power. If you do this then the Aux Power and the Battery will be in
    Parallal with the LOAD. When you disconnect the Aux Power the
    Battery could keep the Aux Power Relay energized. The operating
    Manual says nothing about turning the Master Off to break the Seal
    in.

    What is the correct procedure? I am thinking that when you have the
    Aux Power Relay you should start with the Master OFF( thats what I
    did in my Cessna 310). The Aux Power relay will energize all that
    the Battery Relay did. Once started and the Aux Power is removed the
    Aux Power relay will drop out and you then turn the Master and Alt
    on.

    If you start as the Operater manual says i think that you would have
    to turn the Master OFF after starting to drop the Aux Power Relay
    out then turn the Master and Alt ON.

    I would like to hear comments from people that have used the 24 vdc
    Aux Power system

    Mike Dawson




    _______________________________________________
    BAC-Mail mailing list
    BAC-Mail@beechaeroclub.org
    http://www.beechaeroclub.org/mailman/listinfo/bac-mail



    _______________________________________________
    BAC-Mail mailing list
    BAC-Mail@beechaeroclub.org
    http://www.beechaeroclub.org/mailman/listinfo/bac-mail

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