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Old 1st January 2009 | 21:15
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Robert Woodhouse
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New modern aircraft definitoin

Back again - still looking for a definition and also for updated altimeter specs. The current ones have not changed since the 1950s and the ECAC Working Group currently involved do not appear to be making much progress (difficulty getting consensus from manufacturers).

The pressure altimeter spec used in the Monte Carlo model inplementing the Pinsker solution is that given in the Board of Trade Report of the UK All Weather Operations Committee about 1968. Unfortunately this report was sent to the Public Records Office under the 30 year rule, and efforts to trace it have proved fruitless. If anyone knows where w can find a copy please let me know!

The RVSM criteria are not much help as it concentrates on errors at 40,000 ft., not on approach to land. We have also the FAA SAAAR altimeter error ASE equation (a quadratic with height as the variable), but that is no good as it was devised from data on one aircraft flown at max Mach number or IAS through a range of heights. Again, not quite the approach to land!

By the way, we never had any theoretical background on Pinsker's solution - only the two non-dimensionalised graphs. However, we now do have the ful background from Dr. Radislav Danilov from Russia, who wrote his PhD thesis on it many years ago. Jerry Robinson from Boeing fixed a contract to have him write it up and it should appear in the new Collision Risk Algorithm Manual from ICAO later this year. There will also be details of a validation made by Dr. Dave Staplelton using data from a KC10 program.

So - still looking for a definition for "new advance aircraft".
 
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