New Look.....
Thankyou to all responses to my # 6155 , # 6181 , # 6220 and # 6225....mainly concerning theSuperTANS..
..the inescapable fact remains that the RNS252 from the crash , had both the GPS and Doppler 'plots' initialized to the location of a grass field about halfway between Aldergrove and the town of Antrim ........
IF this is where the flight departed from ? then it would be correct.............
But as it departed from Aldergrove......surely this is wrong , and has to be either........
a fault on the equipment.....
or a mistake by somebody ....
or a third possibility....it was intentional......ie.. known and accepted......
....any astute navigator would realise that an offset applied to navigation equipment would effectively move all the waypoints in a certain direction.............in this case the offset moved waypoint 'A' out to open sea away from the coast and the lighthouse......
..the remaining waypoints were less affected as it only changed the distance to run ....
..If they had stuck to the Doppler source this strategy would have guided them on a safer course.........as this was the last time the doppler source was initialised.........
GPS on the other hand , by its very nature will attempt to constantly update its positon if allowed......
I am more than a little suprised that no-one has pointed this out before , given the high level of scrutiny applied to the altitude data by many people..?? !!!!!??!!!!!.......
In the analysis of any problem , it is important to assess ALL the data which is available not just the bits
that interest oneself , or those which are more easily understood owing to one's background and training .
Any enquiry can only be as good as the persons on the board or panel.......if they fail to ask pertinent
questions or call expert witnesses or if they back down over any sort of confrontation , they will never hear the complete story.........
The data recovered from the RNS252 was valid and readable , any corruption would have been obvious . The fact that it only gives a limited picture does not make it less valid........only less useful ...........
The Doppler settings were found to be correct for flight over water.......
..but the less reliable GPS source (in those days )was selected.....????
Pilot error maybe , but not GN....