jetcareers - View Single Post - ERJ thrust (TO-1 or ALT TO-1)

goredbirds · February 27th, 2008, 23:48

First of all, the EMB I fly has A1, and A1/D engines, so don't take this as gospel.

My airline uses ALT T/O - 1 as the standard takeoff setting. We pump it up to T/O -1 for things like contaminated runway, wndsr, rwy limited take off, captain's discretion, etc.

I don't think thrust numbers are published outside of the max ratings you mentioned.

The difference between FADEC software versions exists because the smarty-pants engineers decided the EMB-145 had different thrust requirements than the EMB-140 / 135. Instead of trying to make expensive engine differences they simply altered the software. Therefore, ALT T/O -1 in the 145 will give you more thrust in the 145 than in the 140. Also, in the 145 if you have an engine failure the FADEC gives you T/O which is the max amount of power available. On the 135 if you have an engine failure, the FADEC gives you T/O, which is NOT the max thrust available. To get the absolute maximum amount of power out of the still operating engine, you have to push the thrust levers up past the detent to achieve T/O RSV.

Always remember that with this airplane and these engines the only thing that has authority to give you more thrust is the FADEC. The thrust levers are only suggestions to the computer, which then calculates exactly how much thrust it is willing to give you.

February 27th, 2008, 23:48	#2
goredbirds Junior Member Join Date: Nov 2005 Location: St. Louis Posts: 58	Re: ERJ thrust (TO-1 or ALT TO-1) First of all, the EMB I fly has A1, and A1/D engines, so don't take this as gospel. My airline uses ALT T/O - 1 as the standard takeoff setting. We pump it up to T/O -1 for things like contaminated runway, wndsr, rwy limited take off, captain's discretion, etc. I don't think thrust numbers are published outside of the max ratings you mentioned. The difference between FADEC software versions exists because the smarty-pants engineers decided the EMB-145 had different thrust requirements than the EMB-140 / 135. Instead of trying to make expensive engine differences they simply altered the software. Therefore, ALT T/O -1 in the 145 will give you more thrust in the 145 than in the 140. Also, in the 145 if you have an engine failure the FADEC gives you T/O which is the max amount of power available. On the 135 if you have an engine failure, the FADEC gives you T/O, which is NOT the max thrust available. To get the absolute maximum amount of power out of the still operating engine, you have to push the thrust levers up past the detent to achieve T/O RSV. Always remember that with this airplane and these engines the only thing that has authority to give you more thrust is the FADEC. The thrust levers are only suggestions to the computer, which then calculates exactly how much thrust it is willing to give you. __________________ My name is Inigo Montoya...