Glide Approach
I remember my own base training in the UK on the Viscount 700 in 1967 where the same manoeuver was required on finals. As far as memory serves it was done from 1500' and when the threshold disappeared from view the throttles were closed and full (47 deg?) flap was selected - a setting that could only be achieved when the throttles were closed - they automatically retracted to the penultimate setting if power was applied. The aiming point was the mid point of the runway and a flare started very early. I can only assume that was part of the required test for the 1179. In my case the aircraft then soldiered on for another 3 years before ultimately being scrapped so it appeared to do it no harm.
I subsequently flew the 800 too but was not required to repeat the exercise on the final base check for that model. (We had the use of the BEA simulator for the conversion and most of the airwork was done on that.)