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Thread: back up AI

  1. #1

    back up AI

    i purchased the new Sporty's Backup AI and will install next month
    with my new audio panel. I also have the Percise Backup Vac
    System. There is alot of discussion about 'loss of Vac' I have
    been flying for over 30 years and did have a Vac Pump go bad once
    but also had 2 AI Gyros fail. The Gyro Fail is the main reason I
    wanted the Elec AI. A failure of the AI is much more dfficult to
    detect than a Gryo winding down due to loss of Vac as only one plane
    of motion may be effected. Crosscheck is the answer for both cases
    but in the case of the 2 AI failures there was a period of time when
    there was some question of what was going on since the Vac gage was
    showing good. The Elec AI gives a more positive and quick
    crosscheck then using 4 instruments,TC,AS,Alt,VSI for Attitude
    verifacation as the DG must also be suspect. Of course all
    insruments must be included in your crosscheck scan. Luckely I will
    have now both backup Vac and Gyro but if I could only have one I
    would opt for the AI. The cost is in line with the backup Vac
    option. I am sure that others will have different opinons due to
    there experiences but this is my '2 cents worth'






    --- In musketeermail@yahoogroups.com, Robert Lewis <vpd401@y...>
    wrote:
    >
    > With all the talk about back up AI's, one item that
    > might be considered to eliminate (much reduce) the
    > risk of a vacuum failure is to install a wet vacuum
    > pump. Their are sources out their for these pumps.
    > Most are rebuilt but they still carry in most cases a
    > life time warranty. The M-20 system provides the pump,
    > hardware and oil/air separator, you supply hoses. It
    > comes with an STC. The price is around 2K complete.
    > The other option is to buy a pump from the rebuild
    > source, either in Texas or OK(500 bucks), buy a Beech
    > air/oils separator(50 bucks all day long on ebay) and
    > complete the install with a 337. Sigma Tec also sells
    > a new style dry pump and the reviews coming in are
    > excellent. They cost about 1800 bucks. The reason I
    > went with the wet pump vs the electric AI was panel
    > space and wing leveler requirements. I saw the install
    > of the wet pump as a way to keep all the equipment I
    > had without moving or removing anything in my panel. I
    > also went to the Brittian wing leveler and it is vac
    > operated. I wanted a proven system that would power
    > the equipment and provide me with some security. I
    > looked for articles on failed wet pumps and I found
    > none. I'm sure it has happened but, all reports are
    > that mine should last the life of the engine. You do
    > have the extra plumbing and you need an air/oil
    > separator as the pump uses engine oil for lubrication.
    > The sigmatec came out after I made my purchase or, I
    > may have gone that route. I want to thank all for the
    > icing information. I found it very informative. As a
    > new instrument pilot these real life stories are great
    > reminders of what can happen. The fact that they
    > occurred in similar aircraft make the information a
    > reality. Merry Christmas to all.
    >
    >
    >
    >
    > __________________________________
    > Yahoo! for Good - Make a difference this year.
    > http://brand.yahoo.com/cybergivingweek2005/
    >







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  2. #2

    back up Ai

    I beleive the cigareete lighter wire is way to thin to support any
    electrical usage that would draw 10 amps or more for any length of time and
    burn up the wire. Also I don't believe the circuit breeaker works in reverse
    either. If you want to power up your electrical system with a back up
    battery pack you should have a special adapter installed that is protected
    by circuit breakers and delivers power directly to the buss with the
    appropratetly rated wires to handle the load.


    ----- Original Message -----
    From: "Robert Lewis" <vpd401@yahoo.com>
    To: <musketeermail@yahoogroups.com>
    Sent: Tuesday, December 27, 2005 1:12 AM
    Subject: [musketeermail] back up Ai


    > For the guys that want an electrical back up system, I
    > believe there is a battery pack that plugs into a
    > cigarette lighter plug that provides electrical power
    > that times out depending on load. That might be a nice
    > addition to the pilot carry on case.
    >
    >
    >
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    >
    >
    >
    >
    >
    >
    >



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  3. #3

    back up Ai

    These are valid concerns, if someone is trying to "roll their own" solution.

    The standby battery pack I am referring to contains internal regulation to prevent excessive current flow through the lighter wiring. In fact, the pack's wiring to its plug is probably smaller than the aircraft wiring to the receptacle, in most cases. It is specifically designed to recharge a main battery, at a limited rate, through the lighter receptacle. It recharged my old truck's main battery in about ten minutes, to the point that the starter spun over the 351W faster than it did under normal charged-battery conditions.

    Unfortunately, the compact but powerful packs I use were not on the market very long. They were selling for only $20 from Harbor Freight, about seven years ago. I bought one for all of my family and flying friends, and most remain in service today.


    ---------- Original Message ----------------------------------
    From: "Gary Hylinski" <ghylinski@snet.net>
    Reply-To: "Gary Hylinski" <ghylinski@snet.net>
    Date: Tue, 27 Dec 2005 07:08:17 -0500

    I beleive the cigareete lighter wire is way to thin to support any electrical usage that would draw 10 amps or more for any length of time and burn up the wire. Also I don't believe the circuit breeaker works in reverse either. If you want to power up your electrical system with a back up battery pack you should have a special adapter installed that is protected by circuit breakers and delivers power directly to the buss with the appropriately rated wires to handle the load.



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