Can I just buy the
spars and put them in?
In a nut shell, No. Picture trying to replace a rectangular
wood beam with an I-beam. The parts just do not mate properly
for an item important to the structure of the aircraft. The
metal spar wings required all new ribs tank supports, and drag
truss parts to be assembled. So, the metal spar wing only
shares a small handful of parts with the old design.
Can I buy it as a
Technically you could buy each piece and build a new wing
yourself. However, its much less expensive to let us assemble
it. It is a rather large assembly at a reasonable price. Keep
in mind that price is entire wings, assembled and covered
with all new parts.
What is the other
metal spar wing kit on the market?
Basically it is an STC that replaces the wood spars with metal
spars. To allow the proper fit, many spacers are used to get
the assembly to hold together. Consult the "Engineering
Reasoning" link for explanation as to why this is normally not a
Are there any AD's
on the wings? Are they complied with?
All AD's are required to be complied with before they can leave
the facility. This is a FAR requirement. There are no AD's on
the current production wings. There was an AD on the strut
attach fitting in 1996, requiring replacement of the fitting
with a new design. This was, of course, resolved immediately,
and all wings since came with the new design.
Ok I put them on,
what is my approval basis?
These wings are similar to a STC, but act more like a
replacement part. So an entry should be made similar to this:
"7-???? wings and 5-??? struts were installed per 7-????
Both items are FAA approved data through our drawing list. The
installation print will be provided with the wing delivery.
How do I get the
gross weight increase?
First, you need to buy the wings and put them on. Wings then
come with the proper paperwork you will need. This paperwork is
simply a new flight manual or supplement. That's all you need.
What does ACA do
with the returned wood wings?
We disassemble them. The aluminum is recycled. The wood has
been known to make a nice set of bunk bed frames or a pleasant
banana tree. We don't reuse any of the parts. Mainly, the
return of the wings takes these items off the market.