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Thread: Original Model 19/23/24/76 Floorboard Specifications

  1. #1
    mike at

    Original Model 19/23/24/76 Floorboard Specifications

    Finally got some hard data on the factory Beech floorboard material. The
    Model 76 Duchess shares most of the same floorboard part numbers with the
    Models 19/23/24. I have updated the BAC FAQ with this data. Apparently the
    original floorboards, which I had measured at a quarter-inch thick, had
    swollen somewhat from oil or moisture or both. Or perhaps they were not
    really original after all, as they were at least four-ply (though it was
    hard to tell on such thin wood). Pay attention to the grade (A-B), as this
    will be important in such thin plywood. Any knots or voids would
    significantly affect the strength and puncture resistance. Each ply of the
    wood will only be 1/16" thick.

    Floorboards P/N 169-530004-205, -211, -223, -565, -571 are manufactured from
    commercial fir plywood sheet, grade A-B, 3 ply, 0.187 thick (nominal 3/16"
    thick). Then the floorboards are treated with a fire retardant to meet FAA

    BAC-Mail mailing list

  2. #2
    Warning... thread resurrection...

    What fire retardant is used on the floorboards? Is it really necessary?

    The boards in my Sierra are 1/4" not 3/16" as stated above. I am pretty sure they are original. They have the serial number all over them(but I guess that could have been added by someone making new ones.) I was going to use 1/4" 5ply Baltic Birch.
    J Jones B24R MC-366 N9372S

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