I know, the collection chamber? Sammlungskammer is inside the engine cowling. Behind the inlets - at least the Mark 1 has three intakes - one is on the top of cowling (I am quite sure this the important one) and 2 are left and right. German Manual says nothing more about them.
Wiki says about the Allison 250 C20:
Allison adopted a reverse airflow engine configuration for the Model 250: although air enters the intake/compression system in the conventional fashion, the compressed air leaving the centrifugal compressor diffuser is ducted rearwards around the turbine system, before being turned through 180 degrees at entry to the combustor.
Perhaps, collection chamber is wrong translated, better is centrifugal compressor diffuser...
English handbook would be nice - but I have only a German one...
The "Zweitluftsystem" is important for me, because inlet-flaps are animated in models and system closed impacts performance like real.
Thomas
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