Johan IRL with NDB (No GPS or DME) you only have the aid and for the instrument approach you need a positive fix, that is passage over the aid.

This is basically a guided DR approach which is all done on timing by the watch. Your TOD from FL does not alter, nor the quick calc to get the distances around the pattern based on still airspeed (what is depended on the category; A, B, C or D. The 727 is a category C-D aeroplane, so your flying the approach at 180 knots plus until turning inbound, think of the turning inbound as the base leg of a circuit to give you a picture in your head of the height and distance. You will naturally slow to VREF once at minima but not below 150 knots until then.

You time the TOD point, plus or minus it will be spot on and go on down with the 3x profile as per normal and continue that inbound to the aid or NDB, now if your too high once you go over the top of the NDB then a quick holding pattern will lose that for you and give you time to configure the aircraft for app and landing and then on down not below the minimas using TIMING all the way as per the approach procedure. If you stay within the speed range for your category of aircraft and too the timing then you will be in the clear all the way. Noo greater than Rate 1 turns throughout.

Try that, remember it is just timing, you will find the clock on the left hand side upper cockpit very handy now as it is right in view all the way and has a stopwatch facility.