Thanks for the update POB. Nothing new it seems.
Reading what you wrote, made me realise that perhaps I didn't explain myself clearly enough in the previous pages about the altimeter settings. By my reckoning, the aircraft was low even before the 1.5km point. I'll cut the jargon and simplify the explanations and assume the altimeters were working perfectly and there were no other errors.
The altimeter measures altitude above a datum. Datum can be viewed as, where is the altimeter measuring from. The datum can be sea level, airfield level or a standard value. The datum is set in the altimeter which allows it to read the altitude. This datum is a pressure value either in hectopascals or millibars.
So imagine that we have an airfield that is at sea level (zero feet). If I now set the datum in the altimeter at sea level and I am on the airfield, the altimeter will also show zero feet.
Now imagine that we have an airfield which is 100 feet high as measured from sea level. If I now set my altimeter datum to sea level, the altimeter on the airfield will show 100 feet but if I set the datum to the airfield, it will read zero feet. So it becomes important that the pilot knows which datum is set.
So in this disaster, it seems that the pilot had set sea level datum but for whatever reason, mistook it as airfield datum. Therefore according to the
chart, at 6.10km from the runway, the aircraft should have been at 300 meters above the airfield, not sea level. Likewise at 1.10km from the runway it should have been 70 meters above the airfield and not sea level.
Assuming he had set sea level as the datum, than 300 meters at the 6.10 km point would have been only 79 meters above the airfield since the airfield is 221 meters above sea level. The altimeter would have been correctly showing 300 meters (since it is measuring from sea level) when in fact the aircraft was actually only 79m above the airfield! That would be way too low. And so the aircraft continued on that trajectory until it hit the tree at about the 1km point from the runway.
Hopefully this is a clearer explanation and it helps explains how this disaster could have happened. :)