How dare they come online without knowing the purpose of a secondary wing spar. Looks like someone has been sleeping during their 6th grade aeronautical engineering lesson in middle school.

The Secondary Spar plays an important part in the structural integrity of the wing! It is installed in the rear section of the wing edge, to protect the wing from "flexing" during operation of the flaps during flight.
Unlike the main spar, the secondary spar usually doesn't go through the fuseledge to connect both sides. Where the wing flaps,, engine mounts and landing gear transition area, there are extra strong wing ribs, extra gussets to strengthen the whole assy.
The VFe of any aircraft is usually based on stress tests during development to see where the maximum speed load is before the rear or secondary spar fails.
Ran across this the other day and thought it might be interesting to some:


Associate Editor taking a break!