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Old 6th Feb 2006, 09:43
  #366 (permalink)  
Fanie Jordaan
 
Join Date: Jul 2004
Location: SA
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EC120 Hot Start : T45 Control Aid

Hi all Colibri operators,
Received an information leaflet and questionaire from a subsidiary of Turbomeca, concerning T45 control during start.
The subject has been thrashed to death on this forum, and it would seem to have made TM take notice. The limited information seems to indicate a T45 rate of increase software solution. By installation of a linear actuator fed by the processed information from the VEMD, the fuel input can be limited to prevent a overtemp.
The leaflet states the operation as follows:
"OPERATION"
"The linear actuator acts on the stop of sheath of the driving flow command. It is controlled by a law programmed in the T45 controller. This is obtained from parameters such as N1,P0 and T45.
The actuator is authorized to operate by the T45 controller as long as N1 is lower than 60%. It is inhibited once this threshold is exeeded.
The CT45 system ensures a starting aid whatever the conditions(cold weather ,altitude)"
"ADVANTAGES"
"The starting procedure remains unchanged but the control of the T45 is no longer necessary.
Furthermore the pilot keeps the control on the system: he can, if necessary,reduce the fuel flow, cut the power or increase the fuel flow."
Sounds good if it works. Will be available as a retrofit. Wonder if you can negotiate with ensurance regarding reduced rate on "Turbosure" insurance
Fanie Jordaan is offline