5
The wing “saddle” structure was examined and the foam insert covering the underside of
the saddle was carefully removed. This centre section is attached solely with contact cement
(possibly deliberately as to allow repairs) and was removed. This exposes the cable channels
below.
This photograph indicates the original arrangement of the spars and the cabling exposed
once the cover panel is removed.
There is unacceptable bending of this section as the spars do not meet at the central point.
There is a small diameter auxiliary spar buried in the foam (looking down into the small
“slit” area and the central cable passage for the landing gear cables this can be seen) and it
is between this tubular auxiliary spar and the wooden spars that the modification was
effected.
Maintaining the wooden spars firmly onto the aft side of the spar slot the foam between the
wooden spars and the tubular auxiliary spar was carefully removed down to the depth of
the recess for the wooden spars.
The foam removed included the foam between the inboard ends of the wooden spars.
This encroaches slightly on the circular opening for the speaker although this is not an issue
as will be noted later in this write up.
Original wing spar arrangement and
PCB for cabling and lights – lack of
transverse continuity
