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Thread: Agusta AW139
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Old 26th May 2014, 11:39
  #1651 (permalink)  
tottigol
 
Join Date: May 2004
Location: Tax-land.
Posts: 909
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Tomas, yes and yes.
4 cue, or coupled collective channel operations allow protection by means of PI limiting.
Since avionics software Phase 4, the AW139 engines and xmsn are protected from exceeding the limitations in both AEO and OEI conditions. When operating with any collective mode engaged the AFCS prioritizes rate of climb over IAS to maintain a set maximum rate of PI.
OEI PI is set at max cont 140% over 60 KIAS, AEO is 97% PI over 60 KIAS. The pilots can still manually override the collective but once released the system returns to the max allowed PI value to maintain the requested RoC, if able.
When limiting PI, IAS may be reduced to VY (if needed) in order to maintain ROC.
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