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Old 20th Apr 2010, 12:16
  #802 (permalink)  
Ptkay
 
Join Date: Oct 2004
Location: Europe
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Last theory from the Smolens.ru forum.

The outer NDB with marker in Poland is usually 4 km from the threshold,
and the inner NDB with marker - 1 km.

It has been confirmed, that the outer NDB in Smoleńsk,
due to terrain situation was 6 km from the threshold.
(Which is quite common in Russia.)

If you assume the 2,6 deg glide-path the 2 km error in distance
would result in 90 m altitude difference at the 1 km NDB,
which corresponds approximately to the altitude deficiency the
accident aircraft experienced at this point.

The pilots, assuming outer NDB at 4 km and following the
normal glide path were 100m lower then they should be.
Continuing with the angle of 2,6 deg they were still 2 km
from the runway, at the moment, when they expected threshold,
and at 1 km from the runway already below the runway level...

Fits the fact known until now quite well.



The lowest line in this diagram corresponds to 2.66 deg from 6 km NDB.
It's 0m QFE point is exactly 2km back from the touchdown point 300m
down the runway.

Plausible?

Anyone?
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