According to the data recorded by the cockpit voice recorder several aural landing configuration warnings
sounded (e.g. change landing gear configuration, flaps not selected) when the aircraft was already in
Dutch airspace. This warning is to alert the crew that the configuration should be verified to the stage of
the flight, in this case the landing. The first time the warning sounded was when the aircraft was still at high altitude above Flevoland. Later, during the approach the aural warnings again sounded for several
times. The warnings sounded because the computer systems receive their data from the left radio
altimeter, amongst others, which erroneously transmitted that the aircraft was near the ground. With the
aircraft still above Flevoland there was no reason to select the landing configuration and when the aural
warnings sounded during the approach, the landing configuration was completely according to the stage of
the flight at that time.
http://www.onderzoeksraad.nl/docs/ra...imenary_EN.pdf
Do not know if this has already been discussed here.
So, in the very early stage of the approach there were some hints that something is wrong.