Uptrim?

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   can anyone tell me what uptrim is? something to do with the ATPCS...

Also does anyone know how to stop the VC becoming dark as you turn about the sun? I have treid deselecting lens flare and sun glare, but to no effect! thanks
rich

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rici1 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: November-02-2004 Points: 8	Post Options Post Reply Quote rici1 Report Post Thanks(0) Quote Reply Topic: Uptrim? Posted: November-03-2004 at 10:32am
	can anyone tell me what uptrim is? something to do with the ATPCS... Also does anyone know how to stop the VC becoming dark as you turn about the sun? I have treid deselecting lens flare and sun glare, but to no effect! thanks rich

Todd Nicholson Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: October-30-2004 Location: United States Points: 1264	Post Options Post Reply Quote Todd Nicholson Report Post Thanks(0) Quote Reply Posted: November-03-2004 at 11:05am
	As far as the VC, this is an FS issue and happens in all VCs. You can turn on dome lighting and it will help with this.
	Regards,

asfrag Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: October-31-2004 Location: France Points: 99	Post Options Post Reply Quote asfrag Report Post Thanks(0) Quote Reply Posted: November-03-2004 at 11:40am
	The uptrim is a part of the ATPCS system, the other one is the Auto feather. First of all, to have the ATPCS active, PWR MGT must be in the TO position. Then, for example: when after take off one of your engine fails and stops, the ATPCS sequence will start, providing you with Auto feather (the failed engine prop's will pass automaticaly to Feather position) and UPTRIM on the running engine. Actually during normal take off, you can notice that, with PL in the notch, you have 90% indicated on the torque, that's normal. When the UP TRIM starts the torque increases immediatly to 100%. It provides the maximum power to the alive engine. That's why in case of engine failure after take off you MUST check that the Up trim AND the Auto feather system work properly.. otherwise you have to move the PL manualy to 100% and the failed prop CL's to FEATHER or the aircraft will be very hard to control, believe me

eagledriver Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: November-04-2004 Location: United States Points: 56	Post Options Post Reply Quote eagledriver Report Post Thanks(0) Quote Reply Posted: November-08-2004 at 10:06am
	asfrag's explanation is correct, although incomplete. ATPCS (Automatic Takeoff Power Control System) does the following things: -provides uptrim to the operating engine up to 10% torque and 1.3% NH, NOT TO EXCEED 100% torque (the objective torque setting for takeoff in the ATR-42 was 92%, hence the "NOT TO EXCEED 100%" clause. -provides autofeathering of the failed engine following a 2.15 second delay (this allows the flight crew time to abort the takeoff, pulling the power back and cancelling the ATPCS autofeathering to give the crew any available reverse that might still be available to the culprit engine). -provides autofeathering of the failed engine on approach (uptrim NOT available since you are manually setting go around power). Hope this helps Terry ATP, ATR-42/72-212/72-212A American Eagle Airlines
	ATRdriver

asfrag Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: October-31-2004 Location: France Points: 99	Post Options Post Reply Quote asfrag Report Post Thanks(0) Quote Reply Posted: November-08-2004 at 12:30pm
	the objective torque is 92% for 42.300 but 90% on 42.500. The 42.300 doesn't have any notch.. everything is done manualy..

eagledriver Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: November-04-2004 Location: United States Points: 56	Post Options Post Reply Quote eagledriver Report Post Thanks(0) Quote Reply Posted: November-09-2004 at 10:03am
	I don't miss flying the 42s!!!
	ATRdriver

Lavish Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: January-15-2021 Points: 1	Post Options Post Reply Quote Lavish Report Post Thanks(0) Quote Reply Posted: January-15-2021 at 2:16pm
	ATPCS is not armed once PWR MGT out of T/O so can we put the ATPCS switch to off and put it back ON again after selecting Landing gear down cos after climb procedure to before go around we will not have ATPCS. Its not standard but just to clear the doubt or is there anything the ATPCS swith in ON position does during flight ?? Thank you