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Thread: Spinner help

  1. #1

    Spinner help

    Flying an aeroplane with out the spinner is not a good idea as it will affect engine cooling


    ----- Original Message -----
    From: Gary Percy
    Sent: Wednesday, June 21, 2006 10:35 PM
    Subject: [musketeermail] Re: Spinner help

    Get that spinner off the aircraft before you fly it again. It will not
    hurt to
    fly without the spinner. It just doesn' look pretty.

    I wouldn't stop drill the spinner. I had the same thing happen to my
    I had a mechanic fabricate a patch to cover the entire crack and then
    some. The
    patch is roughly 2-inches square. (It's not square, but just using that
    give an idea of size). He then riveted it to the spinner with 10 to 15
    (# of rivets from memory without going down to the hangar. It's a
    bunch). He
    then had to make an identical patch, and place on the other side of the
    for balance. You can then have the spinner painted so the patches don't
    unless someone is really looking at your spinner. Been holding up for

    Your other option is to replace the spinner.


    --- In, David Vance <dvance@...> wrote:
    > Dear Fellow Mouse Drivers,
    > Two days ago we discovered a one inch crack in our spinner starting
    > at the prop blade cut out.
    > I know the cost to repair at ASEI. I also know that there is a
    > two-week turn-around on spinner repairs there and they don't have
    > another to swap with me. So the questions are: can / should the
    > crack be stop-drilled? Are there any field repairs available? If the
    > spinner is out for repair, can I still fly the plane? (Hate to be
    > grounded!) How critical is this crack? Can I fly with it? Lastly,
    > does anyone know where I might find a replacement spinner for a 68
    > Thanks!
    > David

  2. #2

    Spinner help

    That's a hanger story that has been going around for years. Cussed and discussed by most everyone I know. I remember this was debunked by one of the news stand periodicals.

    Marty Vanover
    Phoenix, Az.

  3. #3

    Spinner help

    > > I do not know if it is true, but I was told that drill stopping and
    > patching
    > > a spinner is not legal. It must be removed or replaced.

    >I have heard that also,but it is a common practice. I've had numurous
    >emails on this subject, but no one has offered up a FAR regulation on the
    >subject. IF anyone else feels this is not legal, then post some proof,
    >not what you have heard.

    The FARs are not the final word on aircraft maintenance and repairs. The
    Manufacturer's current maintenance instructions are. I can think of
    examples of things that the FAA does not approve of, which the manufacturer
    has obtained specific FAA acceptance of, and there are procedures in the
    maintenance manuals that are not in AC 43.13-1B, the "Acceptable
    Techniques" penned by the FAA lawyers. The Service Bulletins, Letters,
    Instructions, etc. are a wealth of information about safely operating and
    maintaining the plane. There are some Lycoming service publications that
    authorize drilling holes in the engine that if you stop the average FAA
    inspector on the ramp and ask him, would get you the response "Are you
    CRAZY?", and possibly begin FAA scrutiny of your tickets, logs, plane,
    etc. None the less, Lycoming has not only allowed it, they RECOMMEND
    it! So read the manufacturer's service information, not the FARs to
    determine what is acceptable.

    The issue is whether BEECH has authorized or denied repairs to
    spinners. And if they have not denied it, what are the recommendations for
    a proper repair. It may be recalled that a few years back there was a big
    conflict over chrome plated spinners, and the FAA inspectors were actually
    tagging planes on the ramp as unairworthy if they had chromed
    spinners. This resulted from some spinner failures that were suspected to
    have been because of incorrect plating processes introducing stresses into
    the plated spinners. So the FAA "banned" plated spinners. Beech (among
    others) came to the rescue of some Bonanza owners who protested to the FAA
    that their plane CAME WITH a plated spinner and that the spinner was
    approved at Type Certification. The FAA had to admit that not ALL chromed
    spinners were bad, and the policy was altered to seek out only aftermarket
    chroming, and allow all the OEM chromed spinners.

    >As for cooling, I doubt it affects cooling, and flying without a spinner
    >should only be for a short time while the spinner is being repaird or replaced.

    Again the question is: Has Beech stated that a spinner is required? Have
    you consulted the optional equipment listing that came with the plane when
    it was new? The "installed equipment list" is a supplement to the Weight &
    Balance, and lists ALL the required and optional equipment. Many planes
    probably no longer have this important paperwork with the other records for
    the plane. A copy can be obtained from Beech (for a modest fee to look up
    YOUR SERIAL NUMBER on microfiche and copy it). It can be very enlightening
    to read the factory documentation, and it can be helpful at times such as
    this, where the owner and mechanic are unsure what is acceptable for
    removing a part. It would also list the weight and arm of the spinner,
    thus making the updating of the W&B paperwork easy.

    A call to Beech Tech Support would resolve the issue of if the spinner is
    required for flight. On some brands and models it is optional, and I have
    copies of letters to substantiate that.

    Bob Steward, A&P IA
    Birmingham, AL

  4. #4

    Spinner help

    Have to check the REQUIRED EQUIPEMENT LIST. Spinners MAY be required. A
    LONG time ago I verified that the PIPER CHEROKEE I rented was approved with
    or WITHOUT a spinner. I've not done this on the Sundowner ....yet.

    Dr Bill
    N9230S 76 Sundowner

  5. #5

    Spinner help

    Be cautious about running the engine without the spinner. On the Sundowner and Sierra (maybe the Musketeer also but I do not know for sure), the backing plate that the spinner screws to has little ears that stick up behind each blade of the prop that also gets three or four screws. If you run the engine without the spinner, these ears will bend outward from the centrifugal force. Since they are curved to match the shape of the spinner, they do not bend back very nicely.

  6. #6

    Spinner help

    If I were inclined to fly without a spinner (which I am not!) I certainly would not even think about flying without removing the prop and the spinner back plate. Likely, if the spinner is cracked, the back plate is also cracked. I would love to replace my aluminum spinner with one of the modern composite spinners, but alas our helpful friends in the FAA have not allowed it, the makers don't find it worth while to apply for an STC and Raytheon would rather you scrap your airplane for want of a spinner.
    Willis, N8886M

  7. #7

    Spinner help

    Not only do not fly without the spinner on the Sundowners or Sierras, do not run them up on the ramp without the spinner. You take the chance of bending the ears there also. And of course, you know that you have to remove the prop to remove the backing plate.

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