One data point on the "dive brake open" detection with this particular
accident.

I've started a flight three times where the divebrakes were unlocked
and then sucked out as speed picked up.

In the first, 20+ years ago, it was a Blanik where we were past the
point that we should have lifted off. I don't know what made me
looked at the wings, but I did and saw them open. Closed them and we
ballooned up, almost causing a second incident but caught it quick
enough and continued on with an otherwise normal tow.

In the second, 12+ years ago, it was in my Standard Libelle where the
divebrakes mattered little to the Pawnee towplane. A radio call from
the towplane at about 700 ft. and I closed them.

In the third, about 8 years ago at Minden, I was launching in the
ASH-26E and halfway down the runway well past where I should have
lifted off, I looked out to see the brakes open. I killed the power,
and slowed down to taxi speed, taxied around back to the takeoff point
for another launch.

After these teaching moments, I now always glance at one wing on the
takeoff roll once I get good aileron control and again once I'm past
the turnaround altitude (400-500 ft.). It's now part of my takeoff /
climbout procedure, so perhaps each pilot can add this to their
procedures, whether or not there are spoiler alarms on the ship.

Kemp