Mutt,
Not immediately to hand. Will track it down for you. In addition, I have sent you via PM the relevant CASA email contact if you want to get the current story from the man in the chair.
The basic deal was that, if an operator wished to operate on widths less than the ICAO geometric limits, the aircraft Type had to demonstrate a capability to do so.
The testing was pretty straightforward - critical cases addressed (under the desired crosswind conditions - this was the problem, as always .. getting the bird, the people and the wind to align their respective diaries).
(i) minV1 desired/established - Vmcg divergences might well limit the minV1 to something in excess of the AFM figure for this reason. Usually, the divergence problems are near Vmcg as the speed/divergence characteristics are very speed critical.
(ii) simulate wet runway by disabling rudder steering ... or doing the testing in the wet
(iii) look at takeoff failures at minV1 with reject and continue. The problem generally is greater for continue and may require some consideration of V1/VR split where appropriate.
(iv) look at the sidestep approach to land manoeuvre. This doesn't appear to present too much of a problem.
(I can't recall anything else which needed to be done ...)
Normal FT report - measurements of centreline deviation and correlation to timebase and speed, etc.
Techniques varied from siting long lens video (800-1000mm - equivalent to having around 2500-3000mm hanging off a 35mm camera) at the runway head to using high tech on board electronics. Either is fine and, for the low cost needy, the video approach works surprisingly well, allowing scale measurements down to around 10cm.
Once the regulator is satisfied, a FMS provides the approval vehicle.
Thinking back to DC9 characteristics, I would suspect that the MD90 would be a bit tight on 20M unless the minV1 is pushed up a bit. Certainly, I would be a bit uncomfortable flying either aircraft out of 20M without some serious thought to sensible operational restrictions.
.. and this is the crux of the problem which led to consideration of running flight tests - the usual concessions one sees around the place give little, if any, thought to tracking problems under critical conditions.