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Old 21st Sep 2009, 15:06
  #4436 (permalink)  
Graybeard
 
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Belgique:
Perhaps drop to another earlier level of air data processing (i.e. the ADM) and reflect that the pitot takes in BOTH RAM (dynamic) and static pressure (the latter being deducted by static port sourced static pressure to derive the CAS). It's the fact that the two sources of static received by their respective ADM's slip outside allowable minor differences that creates the "reject".
From the ISIS block diagram I copied from a much earlier post, each pitot ADM is a separate module from each static ADM. The static ports are a good distance from the pitot probes, of course. Are you saying each pitot probe has its own static port in addition to the primary static ports? Otherwise, CAS is calculated inside the ADR, whereas altitude at flight levels is more or less raw data, unaffected by airspeed or lack of.

Thanks for the info on the QF anomalies being related to the pitot problems.

GB
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