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Thread: OAT

  1. #1

    OAT

    I checked today with JPI to see if the OAT on their EDM-700/800
    qualifies as a replacement for the factory supplied OAT.

    Sorry to say that it does not.

    Jack
    Sundowner - N6363U



    --- In musketeermail@yahoogroups.com, mediareps@a... wrote:
    > I do not want to drill a hole in my new windshield for the outside
    air probe (thermometer). The crack it ultimately created was one of
    the reasons for a new windshield.
    >
    > Is there a digital gadget with a remote sensor?
    >
    >
    >
    > Tom Corcoran
    >
    >
    > [Non-text portions of this message have been removed]





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  2. #2

    OAT

    Pardon my ignorance, I should know this one, but is the OAT required
    equipment? I strongly suspect that it is not. In which case, you
    don't have to replace it at all, nor use a unit that qualifies as a
    replacement.

    My plane's equipment list doesn't differentiate between required and
    optional equipment, as later model years' lists presumably do.
    Perhaps it's required because the type certificate was obtained with
    an aircraft/set of drawings that included an OAT? I've done without
    one since I changed my windshield a year ago, hanging my hat on FAR
    91.213(d), particularly subparagraph 4, which permits the pilot to
    make a determination that it's safe to do without certain instruments.

    The question/observation applies equally to the EGT, at least in Mice.

    Craig MacCallum
    Sierra N525SB
    Montclair, NJ

    P.S. I put a Davtron 5-way OAT(F & C)/voltage/presalt/denalt gauge -
    sorry, don't remember the number - in my last plane, and loved it.

    --- In musketeermail@yahoogroups.com, "daedalusnj" <daedalus@p...>
    wrote:
    >
    >
    > I checked today with JPI to see if the OAT on their EDM-700/800
    > qualifies as a replacement for the factory supplied OAT.
    >
    > Sorry to say that it does not.
    >
    > Jack
    > Sundowner - N6363U
    >
    >
    >
    > --- In musketeermail@yahoogroups.com, mediareps@a... wrote:
    > > I do not want to drill a hole in my new windshield for the
    outside
    > air probe (thermometer). The crack it ultimately created was one of
    > the reasons for a new windshield.
    > >
    > > Is there a digital gadget with a remote sensor?
    > >
    > >
    > >
    > > Tom Corcoran





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  3. #3

    OAT

    Tom, I have both the through the windshield, cause a crack,
    frankenstein fix as well as a Davtron OAT C/F - Voltage - DenAlt - Pres
    Alt and never look at the through the windshield guage. When I replace
    my windshield I hopt to not have to use the OAT Guage.

    Dave B
    N132P

    mediareps@aol.com wrote on 04/16/2005, 05:32 AM:

    >
    > I do not want to drill a hole in my new windshield for the outside air
    > probe (thermometer). The crack it ultimately created was one of the
    > reasons for a new windshield.
    >
    > Is there a digital gadget with a remote sensor?
    >
    >
    >
    > Tom Corcoran
    >
    >
    > [Non-text portions of this message have been removed]
    >
    >
    >
    >
    > Join BAC today and be a part of the ONLY Type Club for the Musketeer
    > series!
    >
    > www.beechaeroclub.org
    >
    >
    > Yahoo! Groups Links
    >
    >
    >
    >
    >
    >
    >




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  4. #4
    Orbiting Earth Orbiting Earth corcoran's Avatar
    Join Date
    Jul 2004
    Location
    Braintree and Cape Cod, Massachusetts,
    Posts
    1,105

    OAT

    Craig,

    Some of the replies to my question about placing a digital OAT in my plane ran from "none needed" to "required". Some guys used it to tell the density altitude, others used it to determine the freezing level. Most hate the damn thing becuase it is ugly and breaks thousand dollar windshields. Having one will tell you if your interior heater is working very well.
    Personally I like your answer best "not needed". Several guys told about the Davtron unit.

    Tom Corcoran

    -----Original Message-----
    From: craigmaccallum <cmacc@losinc.com>
    To: musketeermail@yahoogroups.com
    Sent: Mon, 18 Apr 2005 20:43:54 -0000
    Subject: [musketeermail] Re: OAT




    Pardon my ignorance, I should know this one, but is the OAT required
    equipment? I strongly suspect that it is not. In which case, you
    don't have to replace it at all, nor use a unit that qualifies as a
    replacement.

    My plane's equipment list doesn't differentiate between required and
    optional equipment, as later model years' lists presumably do.
    Perhaps it's required because the type certificate was obtained with
    an aircraft/set of drawings that included an OAT? I've done without
    one since I changed my windshield a year ago, hanging my hat on FAR
    91.213(d), particularly subparagraph 4, which permits the pilot to
    make a determination that it's safe to do without certain instruments.

    The question/observation applies equally to the EGT, at least in Mice.

    Craig MacCallum
    Sierra N525SB
    Montclair, NJ

    P.S. I put a Davtron 5-way OAT(F & C)/voltage/presalt/denalt gauge -
    sorry, don't remember the number - in my last plane, and loved it.

    --- In musketeermail@yahoogroups.com, "daedalusnj" <daedalus@p...>
    wrote:
    >
    >
    > I checked today with JPI to see if the OAT on their EDM-700/800
    > qualifies as a replacement for the factory supplied OAT.
    >
    > Sorry to say that it does not.
    >
    > Jack
    > Sundowner - N6363U
    >
    >
    >
    > --- In musketeermail@yahoogroups.com, mediareps@a... wrote:
    > > I do not want to drill a hole in my new windshield for the
    outside
    > air probe (thermometer). The crack it ultimately created was one of
    > the reasons for a new windshield.
    > >
    > > Is there a digital gadget with a remote sensor?
    > >
    > >
    > >
    > > Tom Corcoran






    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links






    [Non-text portions of this message have been removed]



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
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    Support St. Jude Children's Research Hospital's 'Thanks & Giving.'
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  5. #5

    OAT

    The OAT is a nice to have item if you take the time to learn the different ways to use it. After twenty years of B52s as a Navigator, we used the OAT to check weather change/forcast, pressure gradiant change for drift information and helping in that long overseas trek when everything that moves in the computer decideds to quit the OAT just keeps working. Rising and falling temps can accompany weather change, wind shift and adverse or favorible weather. It is an acquired art but the OAT can come in handy.

  6. #6
    Guest
    Guest

    OAT

    I can't make the time right now to do the research to cite chapter and verse. My recollection is that if the OAT is not listed in the W&B or required equipment list, it is not required for VFR flight... but that it IS required for IFR flight, to alert you to icing potential when in the soup.

    At the time I installed my Davtron, it was either an approved primary instrument replacement, and/or my A&P-IA at the time included it on a 337. I honestly can't recall the detail from eighteen years ago, but I do recall that we had the discussion about legal replacement before I ordered it. I wanted it because I was installing a new windshield, right after buying the plane.

    ----- Original Message -----
    From: craigmaccallum
    To: musketeermail@yahoogroups.com
    Sent: Monday, April 18, 2005 4:43 PM
    Subject: [musketeermail] Re: OAT


    Pardon my ignorance, I should know this one, but is the OAT required
    equipment? I strongly suspect that it is not. In which case, you
    don't have to replace it at all, nor use a unit that qualifies as a
    replacement.

    My plane's equipment list doesn't differentiate between required and
    optional equipment, as later model years' lists presumably do.
    Perhaps it's required because the type certificate was obtained with
    an aircraft/set of drawings that included an OAT? I've done without
    one since I changed my windshield a year ago, hanging my hat on FAR
    91.213(d), particularly subparagraph 4, which permits the pilot to
    make a determination that it's safe to do without certain instruments.

    The question/observation applies equally to the EGT, at least in Mice.

    Craig MacCallum
    Sierra N525SB
    Montclair, NJ

    P.S. I put a Davtron 5-way OAT(F & C)/voltage/presalt/denalt gauge -
    sorry, don't remember the number - in my last plane, and loved it.

    [Non-text portions of this message have been removed]



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Give the gift of life to a sick child.
    Support St. Jude Children's Research Hospital's 'Thanks & Giving.'
    http://us.click.yahoo.com/5iY7fA/6Wn...ZIAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
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  7. #7

    OAT

    My OAT is mounted in the pilot's side window. Works for me.

    Best regards,

    Steve Robertson
    N4732J 1967 Super III

    --- In musketeermail@yahoogroups.com, mediareps@a... wrote:
    > I do not want to drill a hole in my new windshield for the outside
    air probe (thermometer). The crack it ultimately created was one of the
    reasons for a new windshield.
    >
    > Is there a digital gadget with a remote sensor?
    >
    >
    >
    > Tom Corcoran
    >
    >
    > [Non-text portions of this message have been removed]





    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Help save the life of a child. Support St. Jude Children's Research Hospital's
    'Thanks & Giving.'
    http://us.click.yahoo.com/6iY7fA/5Wn...ZIAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


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  8. #8

    OAT

    When I replaced my windshield,I had my OAT mounted at the side of the windshield, centered low under the diagonal brace on the pilot side: very visible to pilot, yet out of the main view. My original OAT location was up in the middle of the windshield, along with a compass with a "mickey mouse" wire leading down from the ceiling.
    I relocated the compass to the front center top of the glareshield,with the wire going down through to the instruments area. Works great for me.
    Ray Griffin '74 Sierra
    ----- Original Message -----
    From: ke4oh
    To: musketeermail@yahoogroups.com
    Sent: Tuesday, April 19, 2005 7:07 AM
    Subject: [musketeermail] Re: OAT



    My OAT is mounted in the pilot's side window. Works for me.

    Best regards,

    Steve Robertson
    N4732J 1967 Super III

    --- In musketeermail@yahoogroups.com, mediareps@a... wrote:
    > I do not want to drill a hole in my new windshield for the outside
    air probe (thermometer). The crack it ultimately created was one of the
    reasons for a new windshield.
    >
    > Is there a digital gadget with a remote sensor?
    >
    >
    >
    > Tom Corcoran
    >
    >
    > [Non-text portions of this message have been removed]





    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org





    ------------------------------------------------------------------------------
    Yahoo! Groups Links

    a.. To visit your group on the web, go to:
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    c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.




    [Non-text portions of this message have been removed]



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Give the gift of life to a sick child.
    Support St. Jude Children's Research Hospital's 'Thanks & Giving.'
    http://us.click.yahoo.com/5iY7fA/6Wn...ZIAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


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    <*> To visit your group on the web, go to:
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  9. #9

    OAT

    As is ours. Much easier to read (especially for us trifocal types) and if
    it cracks the plexiglass, it is a lot cheaper and easier to replace.

    John



    -----Original Message-----
    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
    On Behalf Of ke4oh
    Sent: Tuesday, April 19, 2005 8:07 AM
    To: musketeermail@yahoogroups.com
    Subject: [musketeermail] Re: OAT




    My OAT is mounted in the pilot's side window. Works for me.

    Best regards,

    Steve Robertson
    N4732J 1967 Super III

    --- In musketeermail@yahoogroups.com, mediareps@a... wrote:
    > I do not want to drill a hole in my new windshield for the outside
    air probe (thermometer). The crack it ultimately created was one of the
    reasons for a new windshield.
    >
    > Is there a digital gadget with a remote sensor?
    >
    >
    >
    > Tom Corcoran
    >
    >
    > [Non-text portions of this message have been removed]





    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org






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    [Non-text portions of this message have been removed]



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  10. #10
    I'm not sure about the Sundowner, but the equipment list for my 1966 Super III shows no mention of the OAT. Also, if you look at the required equipment listed in FAR 91.205, there is no mention of a requirement for an OAT either. Therefore, replacement of an existing unit, or addition of a new unit should be either a logbook entry or a 337.

    I replaced my Scott OAT with a Digital OAT from Questair in Orange, CT. It is battery powered, and fits in the same windscreen opening as a Scott gage. However, it has only a small "Button" sensor, attached to the unit, so there is no Mast protruding from the windscreen. It sells for about $79, and takes 5 minutes to install. If you need to mount it high in the windscreen, tell them you want the angled mount, so you can see it without craning your neck. To use it, you press a button - once for Fahrenheit and twice for Celcius. It turns off the display after 15 minutes to save battery power, and it has internal lighting as well. The batteries are watch type, and there are 2. If the first one goes dead, you turn a selector switch for the second battery.

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