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Thread: I can't find my instrument air filter

  1. #1

    I can't find my instrument air filter

    I have a 1963 Mouse, SN M-238

    The shop manual says "On early aircraft that do not have the gyro
    instrument central air filter kit installed, clean the instrument
    air filter approximately every 50 hours of operation, more often
    under extreme dust conditions. Filters are removed by removing the
    air filter body-cover and taking out the four fillisterhead machine
    screws. Lift out the snap ring which holds the filter in place,
    remove the filter. If the aif filter body-cover is not used, the
    filter may be removed by lifting the snap ring past the four
    protective lugs."

    I looked under the panel last night. I can see the instrument air
    line where it comes through the firewall. Right there is what
    appears to be the "suction relief valve." From there it goes to the
    AI, from there to the DG. Those lines are metal. I see some
    plastic tubing going to the suction gauge. I don't see anything
    that looks like a filter. Could it be on one or more of the
    instruments? If I don't have a "central air filter kit" what kind
    of air filter would I have?

    Cloyd
    President, BAC




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  2. #2

    I can't find my instrument air filter

    There should be a second set of lines running from the instruments to the filter unit. You are looking at the side between the instruments and pump, where the air exits the instruments. The main filter should be on the side where the air enters the instruments. In the absence of a central filter, I thought each instrument would just have a sintered bronze fitting that acts as a very fine filter. I don't know what it is that is being described in your text, as it sounds like a form of central inlet filter.

    ----- Original Message -----
    From: cloydvanhook
    To: musketeermail@yahoogroups.com
    Sent: Wednesday, May 18, 2005 10:18 AM
    Subject: [musketeermail] I can't find my instrument air filter


    I have a 1963 Mouse, SN M-238

    The shop manual says "On early aircraft that do not have the gyro
    instrument central air filter kit installed, clean the instrument
    air filter approximately every 50 hours of operation, more often
    under extreme dust conditions. Filters are removed by removing the
    air filter body-cover and taking out the four fillisterhead machine
    screws. Lift out the snap ring which holds the filter in place,
    remove the filter. If the aif filter body-cover is not used, the
    filter may be removed by lifting the snap ring past the four
    protective lugs."

    I looked under the panel last night. I can see the instrument air
    line where it comes through the firewall. Right there is what
    appears to be the "suction relief valve." From there it goes to the
    AI, from there to the DG. Those lines are metal. I see some
    plastic tubing going to the suction gauge. I don't see anything
    that looks like a filter. Could it be on one or more of the
    instruments? If I don't have a "central air filter kit" what kind
    of air filter would I have?

    Cloyd
    President, BAC

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



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    --------------------------------------------------------------------~->

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  3. #3

    I can't find my instrument air filter

    My 63 definateley has a master filter, in plain sight under the pilot
    side dash, (forget where exactly) in an arrangement as described
    below. Been awhile, but think it was a slip on foam type, as in around
    a 1 to 2 inch diameter circle & about 1 to 2 inches long, with the end
    being closed off. (foam filter open on both ends)

    Jon

    --- In musketeermail@yahoogroups.com, "Mike Rellihan" <rellihan@r...>
    wrote:
    > There should be a second set of lines running from the instruments
    to the filter unit. You are looking at the side between the
    instruments and pump, where the air exits the instruments. The main
    filter should be on the side where the air enters the instruments. In
    the absence of a central filter, I thought each instrument would just
    have a sintered bronze fitting that acts as a very fine filter. I
    don't know what it is that is being described in your text, as it
    sounds like a form of central inlet filter.
    >
    > ----- Original Message -----
    > From: cloydvanhook
    > To: musketeermail@yahoogroups.com
    > Sent: Wednesday, May 18, 2005 10:18 AM
    > Subject: [musketeermail] I can't find my instrument air filter
    >
    >
    > I have a 1963 Mouse, SN M-238
    >
    > The shop manual says "On early aircraft that do not have the gyro
    > instrument central air filter kit installed, clean the instrument
    > air filter approximately every 50 hours of operation, more often
    > under extreme dust conditions. Filters are removed by removing the
    > air filter body-cover and taking out the four fillisterhead machine
    > screws. Lift out the snap ring which holds the filter in place,
    > remove the filter. If the aif filter body-cover is not used, the
    > filter may be removed by lifting the snap ring past the four
    > protective lugs."
    >
    > I looked under the panel last night. I can see the instrument air
    > line where it comes through the firewall. Right there is what
    > appears to be the "suction relief valve." From there it goes to the
    > AI, from there to the DG. Those lines are metal. I see some
    > plastic tubing going to the suction gauge. I don't see anything
    > that looks like a filter. Could it be on one or more of the
    > instruments? If I don't have a "central air filter kit" what kind
    > of air filter would I have?
    >
    > Cloyd
    > President, BAC
    >
    > [Non-text portions of this message have been removed]




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