Because they are interior furnishings rather than
structural components, dados can vary greatly depending upon the cabin
configuration of the particular aircraft. The available plans for the
Lockheed Model 10 are for the airline version and include structures
similar, but not identical, to the object found on Nikumaroro. No plans
or photographs of the final configuration of the cabin of Earhart’s
airplane are known to exist. There are, however, several interesting
observations which can be made about the artifact.
As shown in the reconstruction below, the mounting holes by which
the dado was affixed to the aircraft structure are exactly 15 inches
apart. The Lockheed Model 10 fuselage is built on a 15 inch standard,
with bulkheads, circumferentials and stiffeners spaced, on the average,
15 inches apart.
Specifications for the Lockheed Model 10 call for the cabin area to
be insulated with .25 inch kapok. The insulation, known by the trade
name “Seapak”, was a fabric-kapok-fabric sandwich. One of
the standard fabric colors was blue.
The 90 degree flange along the base of the dado was attached to the
aircraft floor with screws in metal-floored aircraft or nails in airplanes
with wooden flooring. On the artifact, pry marks on the underside of
the flange at the holes indicate that, in this case, nails were probably
used. The floor of the Lockheed 10 was made of wood.