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Thread: Exhaust Cracked recommendations & interior cable reroute.

  1. #11
    walt.buskey's Avatar
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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    Well, for five Franklins and change, that heat muff OTTA be nice looking. (Still bugs me how expensive it was, can you tell?)

    Highly recommend Dawley; the quality of their work really does appear to be outstanding. I guess I hit them at a "good" time, as turn-around in my case was no more than 3 weeks -- I've heard since that they're running longer. May just be the time of year-- I sent mine in after the middle of March last year and got "it" back April 6th. (I'm told that might be a record...)

    As far as inspections... talk to Steve.

  2. #12

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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    The muffler does not need to be pressure checked each 50 or 100 hours. A visual inspection must be completed (through tailpipe and one end of muffler) each 50/100 hours (as required). If the mechanic feels that a more thorough inspection must be made, the muffler can be removed for pressure testing OR the engine can be ground run and the cabin heat checked by a carbon monoxide detector.
    On my personal airplanes, when the muffler reaches 1000hrs time in service since new or last rebuild, I send them to Dawley for rebuild/repair. At 1000hrs they are getting weak.

  3. #13
    Glenn Whitcomb gdubya569's Avatar
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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    They told me yesterday about a week out. Not too bad gives me time to clean and address other things I need to fix.

  4. #14
    Administrator Steve Pierce's Avatar
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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    AD 68-05-01

    (a) For all airplanes except Models J3, J4, J5, PA-11 and those referenced
    in paragraphs (i) and (j), which have exhaust mufflers with 950 or
    more hours time in service on the effective date of this AD, comply
    with paragraph (e) within the next 50 hours time in service and
    thereafter at intervals not to exceed 50 hours time in service from
    the last inspection.


    (b) For all airplanes except Models J3, J4, J5, PA-11 and those referenced
    in paragraphs (i) and (j), which have exhaust mufflers with less than
    950 hours time in service on the effective date of this AD, comply
    with paragraph (e) within the next 50 hours time in service, and
    thereafter at intervals not to exceed 100 hours time in service from
    the last inspection. After the exhaust muffler has accumulated 950
    hours time in service, comply with the inspection requirements of
    paragraph (a).
    (e) Inspect in accordance with paragraph (f), and paragraph (g) if applic-
    able, the engine exhaust muffler and shroud assembly (including the
    internal baffle tube and tail pipe), carburetor heat shroud and air
    duct, support braces, clamps and brackets, exhaust stacks and
    manifolds. Do not alter those mufflers incorporating an internal
    baffle tube to remove the tube without prior FAA approval.
    (Piper Service Letter No. 324B describes the critical areas.)


    (f) Remove muffler assembly, disconnect air ducts, stacks, and shrouds as
    necessary, and visually inspect exterior and interior surfaces with a
    probe light and mirror for signs of cracks, corrosion, burn-throughs,
    heat damage, collapsed stack, or weld separations. For carburetor type
    engines, special attention should be given to the exhaust stack under
    the carburetor heat shroud. Except during the initial inspection, the
    muffler need not be removed from the airplane, provided visual
    inspection with probe light and mirror is made through the muffler
    tail pipe outlet and one end of the muffler at the stack connection.


    (g) If the inspection specified in paragraph (f) shows that the exhaust
    stacks and internal baffle tube are in good condition, but there are
    areas inside the muffler which cannot be adequately inspected with a
    probe light and mirror, accomplish one of the following:


    (1) Accomplish a submerged pressure check of the muffler and exhaust stack
    at 10 psi air pressure.


    (2) Conduct a ground test using a carbon monoxide indicator by heading the
    airplane into the wind, warming the engine on the ground, advancing
    the throttle to full static r.p.m. with cabin heat valves open, and
    taking readings of the heated airstream inside the cabin at each
    outlet (including rear seat heat outlet, if installed). Appropriate
    sampling procedures applicable to the particular indicator must be
    followed. If carbon monoxide concentration exceeds .005 percent or if
    a dangerous reading is obtained on an indicator not calibrated in
    percentages, inspect in accordance with (f), and perform a submerged
    pressure check of the muffler and exhaust stack at 10 psi air pressure
    before further flight.


    (3) Close and secure cabin heat valves at the firewall until a complete
    muffler inspection in accordance with paragraph (f) is accomplished.

  5. #15

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    Default Re: Exhaust Cracked recommendations & interior cable reroute.


  6. #16

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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    Quote Originally Posted by Steve Pierce View Post
    AD 68-05-01

    (a) For all airplanes except Models J3, J4, J5, PA-11 and those referenced
    in paragraphs (i) and (j), which have exhaust mufflers with 950 or
    more hours time in service on the effective date of this AD, comply
    with paragraph (e) within the next 50 hours time in service and
    thereafter at intervals not to exceed 50 hours time in service from
    the last inspection.


    (b) For all airplanes except Models J3, J4, J5, PA-11 and those referenced
    in paragraphs (i) and (j), which have exhaust mufflers with less than
    950 hours time in service on the effective date of this AD, comply
    with paragraph (e) within the next 50 hours time in service, and
    thereafter at intervals not to exceed 100 hours time in service from
    the last inspection. After the exhaust muffler has accumulated 950
    hours time in service, comply with the inspection requirements of
    paragraph (a).
    (e) Inspect in accordance with paragraph (f), and paragraph (g) if applic-
    able, the engine exhaust muffler and shroud assembly (including the
    internal baffle tube and tail pipe), carburetor heat shroud and air
    duct, support braces, clamps and brackets, exhaust stacks and
    manifolds. Do not alter those mufflers incorporating an internal
    baffle tube to remove the tube without prior FAA approval.
    (Piper Service Letter No. 324B describes the critical areas.)


    (f) Remove muffler assembly, disconnect air ducts, stacks, and shrouds as
    necessary, and visually inspect exterior and interior surfaces with a
    probe light and mirror for signs of cracks, corrosion, burn-throughs,
    heat damage, collapsed stack, or weld separations. For carburetor type
    engines, special attention should be given to the exhaust stack under
    the carburetor heat shroud. Except during the initial inspection, the
    muffler need not be removed from the airplane, provided visual
    inspection with probe light and mirror is made through the muffler
    tail pipe outlet and one end of the muffler at the stack connection.


    (g) If the inspection specified in paragraph (f) shows that the exhaust
    stacks and internal baffle tube are in good condition, but there are
    areas inside the muffler which cannot be adequately inspected with a
    probe light and mirror, accomplish one of the following:


    (1) Accomplish a submerged pressure check of the muffler and exhaust stack
    at 10 psi air pressure.


    (2) Conduct a ground test using a carbon monoxide indicator by heading the
    airplane into the wind, warming the engine on the ground, advancing
    the throttle to full static r.p.m. with cabin heat valves open, and
    taking readings of the heated airstream inside the cabin at each
    outlet (including rear seat heat outlet, if installed). Appropriate
    sampling procedures applicable to the particular indicator must be
    followed. If carbon monoxide concentration exceeds .005 percent or if
    a dangerous reading is obtained on an indicator not calibrated in
    percentages, inspect in accordance with (f), and perform a submerged
    pressure check of the muffler and exhaust stack at 10 psi air pressure
    before further flight.


    (3) Close and secure cabin heat valves at the firewall until a complete
    muffler inspection in accordance with paragraph (f) is accomplished.

    Anybody have a copy of Piper Service Letter No. 324B?

  7. #17
    Jim's Avatar
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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    Hi,

    324C is the top item, don't know if it's good for you or not. (Supersedes Service Letter 324B)

    https://www.google.com/search?q=Pipe...=silk&ie=UTF-8

  8. #18

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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    Quote Originally Posted by Jim View Post
    Hi,

    324C is the top item, don't know if it's good for you or not. (Supersedes Service Letter 324B)

    https://www.google.com/search?q=Pipe...=silk&ie=UTF-8
    Thanks Jim!

  9. #19
    Administrator Steve Pierce's Avatar
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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    All the service documents are on the Univair website. Have not had good luck with Wag Aero mufflers.

  10. #20
    smcnutt's Avatar
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    Dec 2007
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    Indianapolis, IN
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    Default Re: Exhaust Cracked recommendations & interior cable reroute.

    Another vote for Dawley from me. Our old muffler appeared to be good externally but the insides were rotted out. Didn't really matter since what we got back appears to be 100% new. I'm sure something was retained from the old just so it could be called 'repaired' but hard to tell from my end. Additional reinforcements and a bail inside to make sure that no blockage can happen in the future. Quick turnaround.

    Sent from my SM-T350 using ShortWingPipers.Org mobile app
    “Seek advice but use your own common sense.”
    ― Yiddish Proverb

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